Part A. PERSONAL DATA

A.1 Current Professional Status

Institution: University of Valencia

Department: Theoretical Physics (Faculty of Physics) and IFIC (Joint UV-CSIC Center)

Professional Category: Full Professor

UNESCO Code: 2212 Theoretical Physics

Keywords: Quantum field theory, electroweak theory, QCD, and Higgs physics. Theories beyond the Standard Model: Dual and string theories

A.2 Academic Background

Degree: Bachelor of Science in Physics, University of Valencia (1981)

Degree: Doctor of Philosophy in Physics, University of Valencia (1985)

A.3 General Indicators of Scientific Production Quality

• Number of six-year research periods: 6 (last six-year period 2012-2017)

• Field of Scientific Activity: Theoretical Physics (Dual and string theories. Theory and phenomenology of elementary particles and their interactions.)

• Research Associate at the Rutherford Laboratory (U.K.) from 1986 to 1991.

• Publications: approximately 75 articles in journals indexed in the SCI (Physical Review, Physical Review Letters, JHEP, Nuclear Physics, Astrophysical Journal, Europhysics Letters, etc.).

• Total citations (Inspire Hep): 1240

• Hours: 21

• Award from the Royal Academy of Exact and Physical Sciences (1985).

A4. General Academic Indicators

4.1. Teaching Service Periods: 6

4.2. Teaching Evaluation Results:

Evaluation of activity through the DOCENTIA program (2015–2020): 189/200

Annual evaluation reports (2019–2024). Average: 4.45

4.3. Management Positions Held (in the past).

Head of the Department of Theoretical Physics: one term.

Secretary of the Department of Theoretical Physics: three terms.

Coordinator of International Relations for Physics for eleven years.

Part B. CURRICULUM VITAE SUMMARY

ORCID Code: 0000-0002-0511-271X

Fields within Theoretical Physics in which I have developed activities whose results are published in international journals.

• Theories beyond the Standard Model (from 2000 to the present and future project). Work carried out with Professors H. M. Chan (Rutherford Lab.) and T. S. Tseung (University of Oxford), along with doctoral students and other occasional collaborators. 35 publications.

Contribution: Development of a theory of elementary particles beyond the Standard Model (Framed Standard Model or FSM) that aims to address some outstanding theoretical problems, such as the hierarchy of fermion masses and mixtures, or "strange" experimental results recently observed in particle physics. During the period indicated, an exhaustive study of the model was conducted, comparing it with experimental data without, so far, finding any contradictions. The results have led to approximately fifty publications and conference presentations.

• Summation rules in Quantum Chromodynamics (1986-89 and 2000-10). This work was carried out with Professors C. Domínguez (University of Cape Town), F. Schilcher (University of Mainz), J. A. Peñarrocha, and V. Giménez (University of Valencia), along with doctoral students and other occasional collaborators. 17 publications. Based on general properties of the two-point correlation function, relationships are established between its asymptotic expansion at high energies and its imaginary part in the domain of hadronic physics.

Novel contribution: Introduction of the finite-energy Laplace summation rule to estimate quark-gluon condensates, heavy quark masses (charm and bottom), decay constants of mesons containing b or s quarks, and other problems related to low-energy hadronic physics.

• String and superstring field theory (1986–2001). Work carried out with Professors H. M. Chan (Rutherford Lab.) and T. S. Tseung (University of Oxford), along with doctoral students and other occasional collaborators. 18 publications.

Novel Contribution 1 (1986-90): Discretization of strings. Treatment of functional integrals through string discretization and numerical calculation of interaction amplitudes.

Novel Contribution 2 (1991-2001): Interpretation of the interaction in string theory by applying the original half-string overlap mechanism to (non-polynomial) string field theory, identifying the parameter space in the different channels as well as the transition region between them, which does not appear in an explicit formulation using Feynman diagrams and must be explicitly included at each order.

Novel Contribution 3: Description of the theory using half-string oscillators (“commas”). Calculation of amplitudes and study of formal aspects of string theory in this formulation, particularly suitable for the formulation of a field theory.

• Two-photon physics in the lepton-hadron collision (1981-85). 3 publications and subject of the Doctoral Thesis. Study of the electromagnetic interaction beyond the one-photon exchange approximation by calculating the two-photon exchange interaction in the lepton-nucleus collision predicted by QED.

Contribution: treatment of the hadronic continuum that depends on characteristic magnitudes of the hadronic structure.

• Parity violation in atoms (1981 and 87). 2 publications and subject of the Bachelor's Thesis. Study of electroweak couplings between quarks and leptons at energies typical of the atomic structure by analyzing atomic transitions sensitive to the mixing of parity-defined states induced by neutral currents.

Novel contribution: introduction of nuclear spin in the study of parity violation-sensitive electromagnetic transitions in muonic atoms.

Part C. MOST RELEVANT MERITS.

C.1. Ten most interesting publications (in my opinion).

1. J. Bordes, H. M. Chan and S. T. Tsou, “A vacuum transition in the FSM with a possible new take on the horizon problem in cosmology”, Int. J. Mod. Phys. A 38 (2023) no. 25, 2350124 doi:10.1142/S0217751X23501245
2. J. Bordes, H. M. Chan and S. T. Tsou, “Unified FSM treatment of CP physics extended to hidden sector giving (i) δCP for leptons as prediction, (ii) new hints on the material content of the universe,” Int. J. Mod. Phys. A 36 (2021) no.31n32, 2150238 doi:10.1142/S0217751X21502389
3. J. Bordes, H. M. Chan and S. T. Tsou, “Accommodating three low-scale anomalies (g-2, Lamb shift, and Atomki) in the framed standard model,” Int. J. Mod. Phys. A 34 (2019) no.25, 1950140 doi:10.1142/S0217751X19501409
4. J. Bordes, H. M. Chan and S. T. Tsou, “Generation patterns, modified γ−Z mixing, and hidden sector with dark matter candidates as framed standard model results,” Int. J. Mod. Phys. A 33 (2019) no.36, 1830034 doi:10.1142/S0217751X1830034X
5. S. Bodenstein, J. Bordes, C. A. Dominguez, J. Penarrocha and K. Schilcher, “Bottom quark mass from finite energy QCD sum rules,” Phys. Rev. D 85 (2012), 034003 doi:10.1103/PhysRevD.85.034003
6. J. Bordes, H. M. Chan and S. T. Tsou, “A Dynamical mechanism for quark mixing and neutrino oscillations,” Eur. Phys. J. C 10 (1999), 63-70 doi:10.1007/s100529900092
7. J. Bordes, H. M. Chan, J. Faridani, J. Pfaudler and S. T. Tsou, “Possible test for the suggestion that air showers with E > 10**20-eV are due to strongly interacting neutrinos,” Astropart. Phys. 8 (1998), 135-140 doi:10.1016/S0927-6505(97)00039-X
8. J. Bordes, H. M. Chan, L. Nellen and S. T. Tsou, “HALF STRING OSCILLATOR APPROACH TO STRING FIELD THEORY,” Nucl. Phys. B 351 (1991), 441-473 doi:10.1016/0550-3213(91)90097-H
9. J. Bordes and F. Lizzi, “Computation of Amplitudes in the Discretized Approach to String Field Theory,” Phys. Rev. Lett. 61 (1988), 278 doi:10.1103/PhysRevLett.61.278
10. J. Bordes, “E(6) Signatures in Atomic Physics,” Phys. Lett. B 190 (1987), 97 doi:10.1016/0370-2693(87)90846-X

C.2. Participation in R&D&I Projects

• Participation in projects funded by the Spanish Ministry of Education and Science (or equivalent at the time) and the EU from 1981 to the present in the field of “Elementary Particles: The Standard Model and its extensions”. Currently with reference PID2023-151418NB-I00 MCIU/AEI/10.13039/501100011033/FEDER.
• Participation in PROMETEO projects funded by the Valencian Regional Government from 2002 to the present in the field of “Particle Physics and their interactions”. Currently with reference PROMETEO CIPROM/2022/36.
• Member of IFIC, Severo Ochoa Center. Currently with reference CEX2023-001292-S.
• Participation in the UVEG innovation project in the period 2009-2015: Virtual Laboratory of Chemical Physics.

[Biography, english version]

I did my undergraduate studies in Physics at the University of Athens, where I graduated in 1985. I then commenced my doctorate studies at the University of California, Los Angeles (UCLA), from where I obtained my Ph.D. degree in 1990. 

My thesis advisor was John M. Cornwall, and my thesis research centered on the construction of gauge-independent off-shell Green’s functions with the method known as “pinch technique”. My doctorate work offered new insights on the structure of the three-gluon vertex, a central ingredient of Quantum Chromodynamics. In addition, the application of the pinch technique led to the first gauge-independent definition of the neutrino charge radius, a quantity currently measured atEnuES and CEnuES experiments. 

Subsequently, I had a two-year post-doctoral appointment (1990-1992) at Brookhaven National Laboratory (BNL), a three-year post-doctoral appointment (1992-1995) at New York University (NYU), a one-year appointment at the CPT of Marseille, and a one-year post-doc at University of Manchester (1997), after which I obtained a Marie Curie Fellowship at the Theory Division of CERN for two years (1997-1999). Since 1999 I have been employed by the University of Valencia, Department of Theoretical Physics, first as visiting professor, then as Ramon y Cajal fellow, and finally as “Profesor Titular”, which is my current position.

A considerable part of my early scientific activity was dedicated in the development of the aforementioned “pinch technique “. In its original form, this technique is a systematic rearrangement of the standard perturbative expansion (Feynman diagrams) contributing to a physical amplitude in such a way as to define gauge-independent sub-amplitudes, which may be interpreted as effective Green’s functions (e.g., propagators and vertices). The activity related to this technique gave rise to a plethora of phenomenological and formal applications, such as the definitions of the QCD equivalent of the strong effective charge, in complete analogy to the text-book construction of the “Gell-Mann -- Low “effective charge known from Quantum Electrodynamics. In addition, a particularly relevant success for phenomenology has been the self-consistent description of resonant amplitudes, in collaboration with Professor A. Pilfatsis (University of Manchester).

During the years 2000-2005 I focused my efforts on the formal foundations of the pinch technique in collaboration with Daniele Binosi (currently a permanent researcher at ECT*, Trento, Italy), who, at the time, was carrying out his doctorate work at the University of Valencia. Our collaboration gave rise to an elegant formulation of the pinch technique in the language of the so-called “background field method” and the “Batalin-Vilkovisky” quantization scheme. The resulting doctorate thesis won the “outstanding thesis prize” for the year 2002, awarded by the University of Valencia, signifying it as the best thesis of the entire university. 

At the level of publications, it is important to emphasize two special items, namely (i) the review article “Pinch Technique: Theory and Applications”, Physics Reports 479 (2009), co-authored with D. Binosi, which to date has collected 450 citations (source HEP Inspires) and (ii) a Cambridge University Monograph (2011), titled “The Pinch Technique and its Applications to Non-Abelian Gauge Theories”, co-authored with J. M. Cornwall and D. Binosi in 2010.

Since 2007 my research activity has centered on some of the most important non-perturbative aspects of Quantum Chromodynamics (QCD), such as the generation of a mass gap in the gauge sector, the phenomenon of dynamical chiral symmetry breaking, the study of the structure of the fundamental vertices of the theory, and the formation of the observed bound states (hadrons) out of the fundamental degrees of freedom known as gluons and quarks.

 In particular, I am one of the major proponents of the key notion that the famous “Schwinger mechanism” operates in the gauge sector of QCD, leading to the subsequent emergence of an effective gluon mass scale. This result has far-reaching consequences for the physics of strong interactions, because it cures the infrared divergences known from perturbation theory, and allows for completely finite predictions for the key QCD observables measured in a variety of experimental installations.

In addition, the emergence of the aforementioned mass allows the meaningful extension of the QCD effective charge, originally defined perturbatively through the pinch technique, to the low-energy regime of the theory. This constitutes a theoretical milestone, because, historically, such a connection has been thwarted by the presence of the destabilizing “Landau pole”.  In this sense,  one accomplishes the smooth transition between the two most celebrated phenomena of QCD, namely asymptotic freedom in the ultraviolet and confinement in the infrared. This work has attracted considerable attention, giving rise to several publications, four invited review articles, and numerous presentations at international workshops.

In addition, and with equal vigor, I have been involved in the study of the non-perturbative structure of the fundamental Green’s functions (also known as “correlation function”) of QCD.  This ongoing activity is based on the fruitful synergy between continuous approaches (Schwinger-Dyson equations) and gauge-fixed lattice simulations.  These functions represent the building blocks of the physical observables studied in hadronic physics, and are of the utmost importance for the meaningful comparison between theory and experimental reality. Especially important in this context is the three-gluon vertex, which is instrumental for the manifestation of asymptotic freedom, one pf the most celebrated properties of Yang-Mills theories, in general, and of QCD in particular. This particular vertex has received particular attention in the last 5 years, and has been scrutinized in detail, in collaboration with the lattice groups of the University of Huelva and the University of Pablo de Olavide (Sevilla).  This research gave rise to terms such as the “zero crossing” and the “planar degeneracy”, which have become household names among the practitioners of this field.

My research activity includes also Physics beyond the Standard Model. In particular, I have various works on the physics related with extra dimensions, mainly in collaboration with Professor Arcadi Santamaria. In addition, I have a long-standing collaboration with Professor Nick Mavromatos (King’s College, London and University of Athens); our more distinguished work is a collection of articles on CPT violation and entanglement, and certain theoretical aspects pertaining to the Moedal collaboration.  

I have an extensive network of collaborators, particularly in Germany, Brazil, Italy, and China.  Specifically, I have been coordinating for over a decade the activities of the QCD group of the University of Campinas, (Sao Paolo). This intense collaboration gave rise to a large number of publications and doctorate titles.  In addition, I hold a one-year EMMI visiting position, (https://www.gsi.de/emmi_visiting_professors) of  GSI, to be carried out at the Institute for Theoretical Physics, University of Heidelberg, for the purpose of strengthening my ongoing collaboration with the research group of Prof. Jan Pawlowski. Moreover, I am a member of the international collaboration led by Professor Craig D. Roberts of the Institute of Nonperturbative Physics (INP) in Nanjing, China, with whom I have co-authored several highly cited articles (94 citations/article). In addition, I have strong ties and fruitful collaboration with the Sevilla and Huelva groups, and in particular with Professors J. Rodríguez-Quintero and F. De Soto.

I am a member of the International MoEDAL Collaboration (Monopole and Exotics Detector at the LHC), https://home.cern/tags/moedal , and I have been voting member of the “International Light Cone Advisory Committee (ILCAC, http://www.ilcacinc.org/ ), for the period 2010-2020. Furthermore I was awarded the American Physical Society (APS) Outstanding Referee Award for the year 2017.  

I have a total of 188 publications, 142 of them in high impact peered review journals, and 40 Conference Proceedings. All these publications have accumulated a total of 9447 citations. My “h factor” is h=59.   https://inspirehep.net/literature?sort=mostrecent&size=25&page=1&q=a%20papavassiliou%2Cj&ui-citation-summary=true

[Biography, english version]