Name: Antonio
Surname: Alfonso-Faus
Institution: E.U.I.T. Aeronáutica, Departamento de Aerotécnia.Universidad Politécnica de Madrid.
E-mail:
Authors: Antonio Alfonso-Faus
Title: BLACK HOLE ENTROPY: LINEAR OR QUADRATIC?
Summary: The entropy S of any mass M can be interpreted as a linear relation with mass, S = k M/m, an extensive property. One can extend this relation to black holes and then we get a different result as compared with the "standard" relation S = k/hc GM^2 , which is quadratic in the mass. We discuss both approaches and apply it to cosmology.

Name: Fernando
Surname: Atrio Barandela
Institution: Fisica Teorica. Universidad de Salamanca
E-mail: atrio@usal.es
Authors: F. Atrio-Barandela, J. Buitrago
Title: Non linear Evolution of Density Perturbations in Friedmann Models Summary: We study the non-linear evolution of Matter density perturbations on dust dominatedFriedmann-Robertson-Walker
models in the Eulerian approach.
We construct a series expansion and obtain all terms by means of recurrence relations that converge to the exact solution in all studied cosmological models. We apply this formalism to estimate the contribution of non-linear evolution of clusters of galaxies to the temperature anisotropies in the Cosmic Microwave Background Radiation.

B
Name: Carlos
Surname: Barcelo
Institution: Institute of Cosmology and Gravitation, University of Portsmouth
E-mail: carlos.barcelo@port.ac.uk
Authors: Carlos Barcelo
Title: Gravitational analogies with Bose-Einstein condensates
Summary: Many aspects of gravitational physics can be simulated in condensed matter systems. Here, I will discuss the capabilities that a Bose-Einstein condensate offers in this respect.

Name: Alan
Surname: Barnes
Institution: Computer Science. Aston University
E-mail: barnesa@aston.ac.uk
Authors: Alan Barnes
Title: On Conformal and other Symmetries
Summary: A simple method of obtaining the conformal Killing vectors of a wide class of metrics is presented. The method involves 'lifting' the conformal symmetries in 3-dimensional hypersurfaces into the full spacetime.

This method can be used to obtain in a straightforward manner a complete classification of the conformal symmetries of a number of well-known spacetimes: spherically symmetrical spacetimes, plane symmetric spacetimes, Stephani universes and many others.

Results on isometries and homotheties can be obtained easily by specialisation of the above results.  Information on Ricci collineations can also be obtained by similar methods.

Name: Marco
Surname: Bruni
Institution: Institute of Cosmology and Gravitation
E-mail: marco.bruni@port.ac.uk
Authors: Marco Bruni and Peter K. S. Dunsby
Title: Singularities on the  brane aren't isotropic
Summary: Recent studies of homogeneous anisotropic universe models in the brane world scenario show that the cosmological singularity in this context is isotropic. It has therefore been suggested that this may be a generic feature of singularities on the brane, even in the inhomogeneous case.
Using a perturbative approach, we show that this is not the case. As in the GR case, the presence of decaying modes in the perturbations signal the instability (in the past) of the isotropic singularity.
The brane universe is therefore not born with isotropy built in: as in standard cosmology, the observed large-scale isotropy and homogeneity remains to be explained.

C
Name: Moshe
Surname: Carmeli
Institution: Ben Gurion University, Physics Department
E-mail: carmelim@bgumail.bgu.ac.il
Authors: Moshe Carmeli
Title: The Cosmological Line Elements in the Hubble Expansion
Summary: The cosmological line elements in the Hubble expansion in terms of distances and velocities are presented and discussed. They are the comparable to the Minkowskian and the Friedmann-FRW metrics.
 

Name: Curt
Surname: Cutler
Institution: AEI-Potsdam
E-mail:  cutler@aei-potsdam.mpg.de
Authors: Curt Cutler
Title: Gravitational-Wave Pulsars
Summary: Rapidly rotating neutron stars (NS's) are a possibly-detectable source of gravitational waves. I review possible emission mechanisms: NS's with "mountains",  precessing NS's, and unstable modes.
I also review the difficulties involved in trying to extract these weak, nearly periodic signals from the datastreams of LIGO,VIRGO,GEO,TAMA.

D
Name: Sergio
Surname: Dain
Institution: Max-Planck-Institut für Gravitationsphysik Albert-Einstein-Institut
E-mail: dain@aei-potsdam.mpg.de
Authors: S. Dain
Title: Initial data for black hole collisions
Summary: In this talk I will describe the construction of initial data for the Einstein equations that can represent a collision of two black holes. I will stress in the main  physical ideas.

Name: Nathalie
Surname: Deruelle
Institution: IAP/GReCO
E-mail: deruelle@iap.fr
Author: Nathalie Deruelle
Title: "Gravity on branes"
Summary: In this talk I shall review various modifications brought to standard 4-dimensional general relativity by the introduction of a 5th dimension and the idea of matter being confined onto a brane. I shall consider linearized gravity  in Minkowski or FRW backgrounds as well as a few exact, spherically symmetric, solutions.

E
Name: Roberto
Surname: Emparan
Institution: CERN
E-mail: Roberto.Emparan@cern.ch
Author: Roberto Emparan
Title: More is different: Black holes in higher dimensions
Summary: There are good reasons to study black holes in dimensions higher than four (and I'll start by reviewing them). Apparently, for many years it's been tacitly assumed that the properties of higher-dimensional black holes should be similar to those of four-dimensional ones. However, recently we've been learning that higher dimensions allow for richer dynamics and new possibilities even for vacuum solutions. I'll describe some of these, focusing in particular on the stability, topology, and uniqueness properties of vacuum black holes, and on how we seem to be only scratching the surface of a relatively little explored subject.
F

Name: Leonardo
Surname: Fernández-Jambrina
Institution: Universidad Politécnica de Madrid
E-mail: lfernandez@etsin.upm.es
Authors: Leonardo Fernández-Jambrina
Title: Towards an open set of regular cosmological models
Summary: The possibility of constructing an open set of inhomogeneous cosmological models which are singularity-free will be discussed

Name: Antonio
Surname: Fernández Martínez
Institution: Universidad de Salamanca
E-mail: anton@usal.es
Authors: Pedro L. García y Antonio Fernández
Title: Fluidos de Robertson-Walker disipativos: Un modelo variacional.
Summary: Se construye un lagrangiano cuyo operador de Euler-Lagrange tiene una familia de soluciones que coinciden con las de la teoría de Eckart-Landau de los fluidos de Robertson-Walker con viscosidad.

G
Name: Dmitri
Surname: Gal'tsov
Institution: Department of Theoretical Physics Moscow State University
E-mail: galtsov@grg.phys.msu.su
Authors: Gerard Clement and Dmitri Gal'tsov
Title: F) branes, F-walls and new brane worlds
Summary: We present new solutions for fluxbranes and brane universes related to so-called exotic branes in the superstring theory

Name: Remo
Surname: Garattini
Institution: Università degli Studi di Bergamo Facoltà di Ingegneria
E-mail: Garattini@mi.infn.it
Authors: Remo Garattini
Title: Space-Time Foam and Vacuum Energy
Summary: Different models of spacetime foam with and without a cosmological constant are taken under examination. The explicit construction of such models is realized by N wormholes in a semiclassical approximation. The zero point energy is explicitly evaluated in terms of Casimir energy by means of variational procedures. Indications on black hole entropy are given. The problem of Lorentz violation is examined in the context of spacetime foam.

Name: Alfonso
Surname: García-Parrado Gómez-Lobo
Institution: Universidad del País Vasco
E-mail: wtbgagoa@lg.ehu.es
Authors: Alfonso García-Parrado Gómez-Lobo y José María Martín Senovilla
Title: Causal Symmetries
Summary:   We introduce a new type of continuous symmetry transformation in Lorentzian manifolds, called causal transformation, characterized by leaving invariant the causal character (and time-orientation) of vectors and curves. The underlying idea is that of causal relationship between Lorentzian manifolds which we have recently put forward in [1].
We perform a detailed study of the mathematical properties of this new symmetry transformation and, in particular, it is worth remarking that the set of causal transformations contains and generalizes the group of conformal transformations, but the whole set is no longer a subgroup but rather a submonoid of the group of all transformations.
We can also define one-parameter submonoids of causal transformations  and their infinitessimal generators, which are vector fields fully characterized by a pair of well-defined equations involving the Lie derivative of the metric and other objects, and conversely. These vector fields include the traditional conformal, homothetic, and Killing fields, as well as some other newer possibilities such as the Kerr-Schild vector fields introduced in [2]. Some examples of causal transformations are provided and we speculate on the possible applications to gravitation theory.

[1] A. García-Parrado and J.M.M. Senovilla, gr-qc/0207110
[2] B. Coll, S.R. Hildebrandt, and J.M.M. Senovilla, Gen.Rel.Grav. 33 (2001) 649-670; gr-qc/0006044)

Name: Enrique
Surname: Gaztañaga
Institution: IEEC/CSIC
E-mail: gaztanaga@ieec.fcr.es
Authors: Enrique Gaztanaga
Title: Weak gravitational lensing signal from the large scale structure
Summary: I will present some recent results on weak gravitational lensing signal measured in the Sloan Digital Sky Survey.

Name: Maria Emília
Surname: Guimarães
Institution: Universidade de Brasília
Address: Departamento de Matemática Universidade de Brasília
Campus Universitário Darcy Ribeiro
CEP: 70910-900 Brasília, DF
Telephone: ++ 55 61 273 33 56
Fax: ++ 55 61 274 39 10
E-mail: marg@unb.br
Authors: MEX Guimarães, VB Bezerra, C Romero, G Grebot and LP Colatto
Title: Some Vacuum Solutions in Scalar-Tensor Cosmological Models with Lambda-Term
Summary: We show some new solutions corresponding to inflationary models in scalar-tensor cosmologies with Lambda term.

H
Name: Luis
Surname: Herrera Cometta
Institution: Universidad Central de Venezuela
E-mail: laherrera@telcel.net.ve
Authors: L.Herrera,W.Barreto
Title: Relativistic polytropes in the static and post-quasistatic regimes.
Summary: Two different generalizations of polytropic relations,to the relativistic case, are proposed and studied. A general method to describe non-static configurations is applied to study the collapsing polytrope in the post-quasitatic approximation.

Name: Alicia
Surname: Herrero Debón
Institution: Universitat Politècnica de València
E-mail: aherrero@mat.upv.es
Authors: Alicia Herrero i Miquel Portilla
Title: On the relativistic theory of evolution of perturbations
Summary: We examine the relativistic theory of evolution of perturbations of an Einstein-de Sitter Universe. The evolution equations are developed including quadratic terms in the derivatives if the perturbations and assuming simple expressions for the isotropic and anisotropic pressures, which include the case of an ideal gas or any kinetic model that might be constructed solving an Einstein-Vlasov problem for collisionless matter. Then we linealize the resulting evolution equations and recover, in different coordinates, the well known analysis done by Lifshitz in 1946. We obtain the general solution, in the coordinate space, of this evolution equation for the scalar mode. We find that the contribution of the initial time derivative has been systematically forgotten. Finally, we analyse the validity of the liner approximation.
 

Name: Sascha
Surname: Husa
Institution: Max-Planck Institut fuer Gravitationsphysik
E-mail: shusa@aei.mpg.de
Authors: S. Husa, C. Lechner
Title: Computer Algebra Applications for Numerical Relativity
Summary: We discuss the application of computer algebra to problems commonly arising in numerical relativity, such as the derivation of 3+1-splits, manipulation of evolution equations and automatic code generation. Particular emphasis is put on working with abstract index tensor quantities as much as possible.
As examples we treat the standard ADM equations and conformal field equations, where we outline how to produce numerical codes starting from the 4-dimensional equations.

I
J
K
Name: Dmitri
Surname: Khokhlov
Institution: Sumy State University
E-mail: khokhlov@cafe.sumy.ua
Authors: D.L. Khokhlov
Title: The shift of time with distance in the static universe
Summary: It is considered the universe the background space of which is the static Euclidean space. The distances are defined by the light rays from the emitter to the receiver. There exists the time shift between the emitter and the receiver the value of which is a linear function of distance. The time shift causes the redshift of the photon frequency with distance which can be interpreted as the Hubble law. Thus the Hubble law can be explained in the static universe without expansion.

Name: Deborah
Surname: Konkowski
Institution: U.S. Naval Academy
E-mail: dak@usna.edu
Authors: Deborah A. Konkowski (USNA), Thomas M. Helliwell and Christopher Wieland (HMC)
Title: Quantum Singularity of Infinite Line Mass Spacetimes
Summary: The definition of G. T. Horowitz and D. Marolf [Phys. Rev. D52, 5670, (1995)] for a quantum-mechanically singular spacetime is one in which the spatial-derivative operator in the Klein-Gordon equation is not essentially self-adjoint.  The definition is used here to study the cylindrically symmetric infinite line mass spacetimes whose classical properties have been discussed in detail by W. B. Bonnor and M. A. P. Martins [ Class. Quantum Grav. 8, 727 (1991)].

Name: Dietrich
Surname: Kramer
Institution: Friedrich-Schiller University, Jena, Germany
E-mail: kramer@tpi.uni-jena.de
Authors: D.Kramer
Title: The double dust solution
Summary: An exact solution describing the static gravitational field of two cylindrically symmetric dust beams of equal mass density but opposite propagation direction is given in closed form.

Name: Andrzej
Surname: Królak
Institution: Polish Academy of Sciences & Jet Propulsion Laboratory
E-mail: A.Krolak@impan.gov.pl
Author: Andrzej Królak
Title: All-sky search for gravitational waves
Summary: We present a set of general tools to search for multiparameter gravitational-wave signals buried in the noise of a detector. Our analysis is based on the maximum likelihood detection method that is related to the matched-filtering technique which is the optimal method in the sense that it maximizes the probability of detection of the signal. We apply our techniques to perform an all-sky search for gravitational-wave signals from spinning neutron stars in the data of the EXPLORER bar detector.  We present the results of our search.

Name: Yuri
Surname: Kubyshin
Institution: Universitat Politècnica de Catalunya, Barcelona and Moscow State University
E-mail: yuri@mat.upc.es
Authors: E. García-Berro, Yu. Kubyshin and P. Lorén Aguilar
Title: Time variation of gravitational and fine structure constants in models with extra dimensions
Summary: We derive formulas for the time variation of the gravitational "constant" and the fine structure "constant" in various models with extra dimensions and analyze their consistency with the observational data.
L
Name: Ramon
Surname: Lapiedra
Institution: Departament d'Astronomia i Astrifísica. Universitat de València.
E-mail: ramon.lapiedra@uv.es
Authors: R. Lapiedra, J.A. Miralles
Title: Gravitational radiation from the magnetic field of a strongly magnetized star.
Summary: We consider the e.m. field of a compact strongly magnetized star. The star is idealized as a perfect conducting sphere, rigidly rotating in vacuum, with a magnetic moment not aligned with its rotation axis. Then we use the exterior e.m. solution, obtained by Deutsch in his classical paper (1954), to calculate the gravitational waves emitted by the electromagnetic field when its wavelength is much longer than the radius of the star. In some astrophysical situations, this gravitational radiation might overcome the quadrupole one emitted by the matter of the star, and, for some magnetars, tis gravitational radiation woul be detectable in the near future, once the present detectors under construction become operative.
 

Name: Ruth
Surname: Lazkoz
Institution: Universidad del País Vasco, Dpto. de Física Teórica e Historia de la Ciencia
E-mail: wtplasar@lg.ehu.es
Authors: Ruth Lazkoz and Juan Antonio Valiente Kroon
Title: The Newtonian limit of  boost- rotation symmetric spacetimes
Summary: We discuss the Newtonian limit of spacetimes describing uniformly accelerated particles using the Cartan-Friedrich frame theory. We give the conditions for the existence of such a limit, and find that
asymptotic flatness is an essential requirement. We illustrate our discussion by means of examples like the
C metric or the generalized Bonnor-Swaminarayan solution.

Name: Christiane
Surname: Lechner
Institution: Max-Planck-Institut fuer Gravitationsphysik, Albert-Einstein-Institut
E-mail: lechner@aei-potsdam.mpg.de
Authors: Christiane Lechner, Jonathan Thornburg, Sascha Husa, Peter C. Aichelburg
Title: Type II Critical Phenomena in a Self-Gravitating Nonlinear $\sigma$-Model
Summary: We report on type II critical phenomena in a family of self-gravitating SU(2) $\sigma$-models. The phenomena strongly depend on the dimensionless coupling constant. As the coupling is decreased the symmetry of the critical solution changes from discrete (DSS) to continuous self-similarity (CSS).
Concerning this transition we present numerical results that support the picture of a bifurcation which is analogous to a heteroclinic loop bifurcation in dynamical systems: two fixed points (CSS) collide with a limit cycle (DSS) in phase space as the coupling constant tends to a critical value.

M
Name: Roy
Surname: Maartens
Institution: University of Portsmouth
E-mail: roy.maartens@port.ac.uk
Authors: R Maartens
Title: Inflation on the brane
Summary: Branewrold gravity introduces interesting new features to the dynamics and perturbations of inflationary cosmology, which I review.
 

Name: Alessandro
Surname: Melchiorri
Institution: University of Oxford
E-mail: melch@astro.ox.ac.uk
Authors: Alessandro Melchiorri
Title: CMB and Cosmological Parameters: Status and Prospects
Summary: A survey is made of the present observational status on cosmological parameters covering both microwave background anisotropies and large scale structure observations such as galaxy clustering and object abundances. I then move to some non-standard aspects of parameter extraction like quintessence, an extra-background of relativistic particles and variations in fundamental constants. Finally, I will discuss a few mechanisms of secondary anisotropies and new experimental constraints.

Name: Felipe
Surname: Mena
Institution: Universidade do Minho
E-mail: fmena@math.uminho.pt
Authors: Filipe C. Mena, Marco Bruni and Reza Tavakol.
Title: Evolution of second order perturbations in flat dust FLRW.
Summary: We present recent results concerning the evolution of second order perturbations in flat dust irrotational FLRW models with a cosmological constant. We show that asymptotically these perturbations tend to constants in time, in agreement with the cosmic no-hair conjecture. We solve numerically the second order scalar perturbation equation and briefly discuss its all time behaviour.

N
Name: Brien
Surname: Nolan
Institution: Dublin City University
E-mail: brien.nolan@dcu.ie
Authors: Brien Nolan
Title: Weak solutions for shell-crossing singularities
Summary: We present weak solutions of Einstein's field equations for collapsing dust spheres which provide dynamical extensions through the shell-crossing singularity.

We discuss causal geodesics in these space-times using Colombeau algebras and hence describe their causal structure.
 

O

Name: Alejandro
Surname: Oscoz
Institution: Instituto de Astrofisica de Canarias
E-mail: aoscoz@ll.iac.es
Authors: A. Oscoz, D. Alcalde, M. Serra-Ricart, E. Mediavilla
Title: Time Delay in QSO 0957+561 From 1984-2002 Optical Data
Summary: Photometric optical data of QSO 0957+561 covering the period 1984-1999 are analyzed to discern between the two values of the time delay (417 and 424 days) mostly accepted in the recent        literature. A first analysis shows that the time delay must be in the interval 420-424 days. From a statistical study, a most probable value of 422.6+/-0.6 days is inferred. The increase of more than 0.2 mag in the optical brightness of the leading image (A) detected during the 2000/2001 campaign could lead to a final      confirmation of this value, provided it is due to intrinsic variability.

Name: Tomás
Surname: Ortín
Institution: Universidad Autonoma de Madrid
E-mail: Tomas.Ortin@cern.ch
Author: Tomás Ortín
Title: Supergravity Today
Summary: In this talk I will review supergravity theories in arbitrary dimensions, overviewing their
structure and construction, their current status and their new uses and applications in
connection with superstring theories.

P
Name: José-Fernando
Surname: Pascual-Sánchez
Institution: Universidad de Valladolid
E-mail: JFPASCUA@MAF.UVA.ES
Authors: J.-F. Pascual-Sánchez
Title: Light cone observations and Cosmological principle
Summary: Within relativistic cosmology, bigger distances  mean earlier times. However, such as function is not defined in the Newtonian approximation to cosmology. The range of this approximation is usually made by considering small galaxy recession speeds and theoretically reinterpreting the Hubble law as a velocity-distance law. However, it is the light dynamical behaviour, the cosmological scale at which light can no be considered as being instantaneously transmitted, that determines this range. Also, it is usually  assumed that the relativistic corrections can be neglected at redshift ranges where the angular diameter distance and the redshift follow a linear relation, i.e., the observational linear Hubble law. In this work, we shall study if average densities along the past light cone, constructed from the three observational distances (observer area, luminosity and redshift), are  affected by relativistic effects. Choosing the average densities constructed from the last two observational distances, even the flat Einstein-de Sitter model can be
observationally inhomogeneous at low redshift values, with some fractal features. However, the observational Hubble law is still linear at low and moderate redshifts (up to z = 1). An observable
fractal universe can be made compatible with standard FLRW models, based on the CP, but also with spatially inhomogeneous models (non based on the CP). As a conclusion we finish commenting the following proposition: "If the Universe looks homogeneous for newtonian astronomers, then this is an
observational evidence against Friedmann models".
 

Name: Sergey
Surname: Pavluchenko
Institution: Sternberg Astronomical Institute; Phys. Dept., MSU
E-mail: sergey@xray.sai.msu.ru
Authors: Pavluchenko S, Toporensky A.
Title: The generality of inflation in some closed FRW models with a complex scalar field
Summary: We investigated the generality of inflation in some closed FRW models, i.e. determined the probability for inflation occur in the case of chosen scalar field potential. We showed that for chosen potentials the probability is high enough and two measures are compared - angular and field ones.

Name: Alicia
Surname: Di Prisco
Institution: Universidad Central de Venezuela
E-mail: laherrera@tecel.net.ve
Authors: A. Di Prisco, L.Herrera
Title: On the energy content of sources for the gamma metric
Summary: We discuss about different definitions of mass for matter distributions producing the gamma metric.

Name: Reinhard
Surname: Prix
Institution: Dpt of Mathematics
University of Southampton
E-mail: r.prix@maths.soton.ac.uk
Authors: R.Prix, J.Novak, G.Comer
Title: Stationary structure of relativistic superfluid neutron stars
Summary: We present results on the stationary structure of superfluid neutron stars in general relativity. The superfluid neutron star is described using a model of two interacting fluids, one fluid represents the superfluid neutrons and the second fluid consists of the comoving charged particles (protons, electrons, muons). We consider general stationary configurations where the two fluids can have different rotation rates around a common rotation axis. These configurations are generally believed to be 'generic' for (slowly) spinning-down superfluid neutron stars, and are at the basis of all current glitch models for pulsars. The numerical results presented are based on the LORENE spectral library, which has been appropriately extended to the two-fluid model.
Q
R
Name: Maria
Surname: Ramos
Institution: University of Minho
E-mail: mpr@mct.uminho.pt
Authors: M. Piedade Machado Ramos
Title: Obtaining type N solutions using invariant operators
Summary: A new method is described for obtaining the pure radiation metric admitting one Killing/homothetic vector field. The model is similar to the one described by Edgar and Vickers when deriving the general conformally flat radiation metric. The solution is constructed by applying the gif operators to the quantities arising in the Karlhede classification of this class of metrics.
The invariant symmetry relations in this case are incorporated in the algorithm. The Karlhede classification is performed for this solution. We show that a conformally flat pure radiation metric possessing one Killing/homothetic vector field has a theoretical upper bound of three (derivatives).

S
Name: Hiromi
Surname: Saida
Institution: Osaka City University
E-mail: saida@sci.osaka-cu.ac.jp
Authors: Hiromi Saida
Title: Hawking radiation in an expanding universe -- PBH evaporation --
Summary: We compute the Hawking radiation in an expanding universe. Then an application to PBHs is discussed.

Name: Misao
Surname: Sasaki
Institution:
E-mail: misao@vega.ess.sci.osaka-u.ac.jp
Author: Misao Sasaki
Title: Cosmological perturbations from inflation
Summary: I will review the generation and evolution of cosmological perturbations in various types of inflation. I start with the standard single-field, slow-roll model. Then I will discuss generalizations to non-standard cases, including a multi-field model and a non-slow-roll model.

Name: Susan M
Surname: Scott
Institution: The Australian National University
E-mail: Susan.Scott@anu.edu.au
Authors: Susan M. Scott, Antony C. Searle
Title: Gravitational wave astronomy strategies and AIGO
Summary: Gravitational wave astronomy will require co-operative analysis of data from a network of detectors around the globe.  An optimal coherent algorithm, analogous to aperture synthesis in radio astronomy, is increasingly practical.  In the past, however, some decisions about the placement of observatories were made on the assumption of a simpler coincidence algorithm.  We have constructed numerical models of the sensitivity (to a population of binary inspiral events) of a global network of observatories under both data analysis techniques.  Using this model, the optimal placements of observatories can be determined.  The Western Australian location of a future Australian-International
Gravitational Observatory (AIGO) was chosen to optimally augment the LIGO observatories in the continental United States, under the assumption of a coincident analysis.  We confirm this, but also
demonstrate that aperture synthesis is much less sensitive to the geographical location of contributing observatories.
 

Name: Walter
Surname: Simon
Institution: Institut fuer theoretische Physik
Universitaet Wien
E-mail: simon@thp.univie.ac.at
Authors: E. Malec, M. Mars, W. Simon
Title: On the Penrose Inequality for General Horizons
Summary: The "standard form" of Penrose's conjecture reads as follows: For an asymptotically flat Riemannian manifold on which the constraints hold, and which contains a trapped surface, the ADM mass is bounded from below by the square root of (16 pi times) the area of the outermost trapped surface (the apparent horizon).

Proofs have so far been obtained in the special case in which (instead of assuming the constraints) the Ricci scalar is assumed to be non-negative, and which contains a minimal surface (instead of a general trapped one). These results are due to Geroch and to Jang and Wald who showed monotonicity of the "Geroch mass functional" under a  smooth inverse mean curvature flow (SIMCF).This highly restrictive requirement of the existence of such a  SIMCF was removed by Huisken and Ilmanen.

I report on substantial progress towards the general Penrose inequality (due to E. Malec, M. Mars and myself, c.f. gr-qc/0201024). Inspired by recent work of Frauendiener, we proceed in 2 steps.

We first show monotonicity of the "Hawking mass" under a SIMCF, and for a suitably restricted class of initial data. Leaving smoothness questions aside, the second step consists of showing  that our conditions on the data can locally be fulfilled by a suitable choice of the initial surface in a given spacetime. In the condition determining the initial surface, there is in fact a free function which can probably be chosen such that the surface reaches spatial infinity.

Name: Carlos F.
Surname: Sopuerta
Institution: Institute of Cosmology and Gravitation, University of Portsmouth
E-mail: carlos.sopuerta@port.ac.uk
Authors: Marco Bruni, Leonardo Gualtieri and Carlos F. Sopuerta
Title: Non-linear relativistic perturbation theory with two parameters
Summary: An underlying fundamental assumption in relativistic perturbation theory is that there exists a parametric family of spacetimes that can be Taylor expanded around a background.  The choice of the latter is crucial to obtain a manageable theory, so that it is sometimes convenient to construct a perturbative formalism based on two (or more) parameters.  The study of perturbations of rotating starts is a good example: in this case it may be convenient to treat the axisymmetric star using a slow rotation approximation (expansion in the angular velocity), so that the background is spherical.  We analyse the gauge dependence of non-linear perturbations depending on two parameters, derive explicit higher order gauge transformation rules, and define gauge invariance in this context.

T
Name: Ryoji
Surname: Takahashi
Institution: Theoretical Astrophysics Center
E-mail: ryoji@tac.dk
Authors: J. Baker (NASA), M. Campanelli (UT Brownsville), C.O. Lousto (UT Brownsville), R. Takahashi (TAC-Denmark)
Title: Modeling gravitational radiation from coalescing binary black holes
Summary: With the goal of bringing theory, particularly numerical relativity, to bear on an astrophysical problem of critical interest to gravitational wave observers we introduce a model for coalescence radiation from binary black hole systems. We build our model using the "Lazarus approach", a technique that bridges far and close limit approaches with full numerical relativity to solve Einstein equations applied in the truly nonlinear dynamical regime. We specifically study the post-orbital radiation from a system of equal-mass non-spinning black holes, deriving waveforms which indicate strongly circularly polarized radiation of roughly 3% of the system's total energy and 12% of its total angular momentum in just a few cycles. Supporting this result we first establish the reliability of the late-time part of our model, including the numerical relativity and close-limit components, with a thorough study of waveforms from a sequence of black hole configurations varying from previously treated head-on collisions to representative target for ``ISCO'' data corresponding to the end of the inspiral period.
We then complete our model with a simple treatment for the early part of the spacetime based on a standard family of initial data for binary black holes in circular orbit. A detailed analysis shows strong robustness in the results as the initial separation of the black holes is increased from 5.0 to 7.8M supporting our waveforms as a suitable basic description of the astrophysical radiation from this system. Finally, a simple fitting of the plunge waveforms is introduced as a first attempt to facilitate the task of analyzing data from gravitational wave detectors.
U
V
Name: Paulo
Surname: Vargas Moniz
Institution: Universidade da Beira Interior
E-mail: pmoniz@dfisica.ubi.pt
Authors: P. Moniz and A. Yu. Kamenshchik
Title: FRW Quantum Cosmology from D-p-Branes. Summary: In this paper we investigate the possible effects of D-$p$-brane solitons within a quantum cosmological scenario. For this purpose, we consider a flat FRW model subject to a specific Brans-Dicke action for gravity and the dilaton. In particular, the Brans-Dicke coupling coefficient $\omega$ is now a function of $d=p+1$, the dimension of the world volume swept by the $p$%-brane  in the physical spacetime. Other fields (like $n-$form fields associated with the D-$p$-brane) are represented by a perfect fluid satisfying consistent physical conditions. Subsequently, we find solutions of the Wheeler-DeWitt equation, which are then thoroughly discussed, namely their semiclassical limits. In addition, we also find that a subset of these solutions satisfy the requirements of {\em N=2} supersymmetry. We further discuss the physical properties of a duality transformation present in the effective action and how it can be related to the standard scale-factor duality characteristic of Pre$-$Post-Big-Bang scenarios.

Name: Mátyás
Surname: Vasúth
Institution: KFKI Research Institute for Particle and Nuclear Physics, Budapest.
E-mail: vasuth@sunserv.kfki.hu
Authors: Mátyás Vasúth
Title: Radiative spin loss in compact binaries
Summary: The radiative spin loss can be obtained by computing the radiation reaction torque acting on one of the bodies in a binary system. Using a general expression of the radiation reaction force, which differs from the one determined by the Burke-Thorne potential, we show that the averaging out property of the radiative spin loss is preserved.

Name: Alberto
Surname: Vecchio
Institution: University of Birmingham
E-mail: av@star.sr.bham.ac.uk
Author: Alberto Vecchio
Title: Early-universe cosmology in the gravitational wave band
Summary: We discuss the key role that gravitational wave experiments will play in the
investigation of the frontiers of cosmology and the structure of fundamental fields at high
energies, by detecting, or setting strong upper-limits to, the gravitational wave stochastic
background produced in the early-Universe.

Name: Raül
Surname: Vera
Institution: Queen Mary, University of London
E-mail: r.vera@qmul.ac.uk
Authors: Raul Vera
Title: Isolated bodies with convective motions in equilibrium
Summary: Astrophysical self-gravitating isolated, rotating bodies in equilibrium are still poorly understood in General Relativity.
The solution of this problem in General Relativity consists first of finding theoretical results on general spacetimes describing rotating objects of a finite size in a stationary regime (equilibrium) together
with an exterior field created by that source.
All the results found so far have used a simplifying assumption which implies a non-convective interior.
I will present some new results on the general problem of the construction of global models describing isolated bodies including convective motion in equilibrium in General Relativity.
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Name: Robert
Surname: Yamaleev
Institution: UNAM, FES-C, Mexico
E-mail: iamaleev@servidor.unam.mx
Authors: R.M.Yamaleev
Title: Second relativised classical mechanics
Summary: We propose an extension of the relativistic mechanics based on two metric forms. Dynamic equations admit two invariants of motion, the first one, is identified with the mass, the other, with the charge of the particle. The extended dynamics contains the speed parameter (besides the speed of light). The kinematics is based on the transformation theory of the elliptiv functions.

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Name: Jozsef
Surname: Zsigrai
Institution: Hiroshima University and Institute for Isotope and Surface Chemistry of the Hungarian Academy of Science
E-mail: zsigrai@freemail.hu
Authors: Jozsef Zsigrai
Title: Perfect-Fluid Spacetimes With Inside Ellipsoidal Symmetry
Summary: Stationary axisymmetric perfect-fluid spacetimes with a so-called inside ellipsoidal symmetry are examined in the framework of general relativity. It is assumed that the four-velocity of the fluid is parallel to a time-like Killing vector field and the conditions for the existence of rigidly rotating perfect-fluid solutions of Einstein's equations are examined.  For the particular subcase in which the gradient of the norm of the time-like Killing vector field and its twist are linearly dependent it is shown that the examined ellipsoidal spacetimes can be considered as interior NUT solutions.  Furthermore, some previously known perfect-fluid solutions are shown to belong to the class of metrics studied in the present work.  Finally, for the complementary subcase in which the gradient of the norm and the twist of the Killing field are linearly
independent an ellipsoidal perfect-fluid solution is given, which, however, can be re-interpreted as a vacuum solution with a nonzero cosmological constant.