Itzhak BarsProfessor of Physics and AstronomyContact Information Email: bars@usc.edu Phone: (213) 7400047 Office: SSC 216B LINKS Personal Website Course Information 
Education 

Ph.D. Physics, Yale University, 5/1971  
Postdoctoral Training 

Assistant Research Physicist, Departmental Fellow, University of California, Berkeley, 09/01/197108/31/1973  
Academic Appointment, Affiliation, and Employment History 

Tenure Track Appointments 

Professor, University of Southern California, 08/01/1983  
Director, CaltechUSC Center for Theoretical Physics, 09/01/199908/01/2003  
Associate Professor, Yale University, 07/01/197908/01/1983  
Assistant Professor, Yale University, 09/01/197506/01/1979  
Assistant Professor, Stanford University, 09/01/197308/31/1975  
Visiting and Temporary Appointments 

Visiting Professor, Perimeter Institute for Theoretical Physics, 12/01/201005/31/2011  
Visiting Professor, Princeton University, 10/01/201011/30/2010  
Scientific Associate, CERN Theory Division, Switzerland, 08/01/199608/01/1997  
Member, Institute for Advanced Study, Princeton, 01/01/199005/01/1990  
Visiting Professor, University of California, Santa Barbara, 08/01/198612/01/1986  
Member, Institute for Advanced Study, Princeton, 01/01/198006/01/1980  
Visiting Assistant Professor, Harvard University, 09/01/197812/31/1978  
PostDoctoral Appointments 

Assistant Reserarch Physicist, University of California, Berkeley, 09/01/197108/31/1973  
Description of Research 

Summary Statement of Research Interests 

Professor Bars studies superstring theory and quantum gauge field theory and their application to the Standard Model of elementary particles, the unification of forces, cosmology and black holes. He has made various contributions to the development of the Standard Model of particles and forces, QCD, and unified gauge theories and established a relationship between string theory and twodimensional QCD. He discovered the Moyal star formulation of String Field Theory (MSFT) which provides a more efficient method for investigating nonperturbative aspects of string field theory using noncommutative geometry. He invented TwoTime Physics (2Tphysics) based on a gauge symmetry that makes position and momentum locally indistinguishable from one another and leads to deep consequences. A striking result of 2Tphysics is the unification of diverse onetime physics dynamical systems as holographic images of a single dynamical system that lives in a higher spacetime including one extra space and one extra time dimensions. In 20062008 he established that all the physics we know today, as embodied in the Standard Model of Particles and Forces, and in General Relativity, is described by a gauge fixed version of 2Tphysics field theory in 4 space and 2 time dimensions. In 2011 2Tphysics showed how to complete spacetime beyond cosmological singularities, thus leading to a new scenario for the very early universe: before the big bang the universe was in a phase of contraction and reached a big crunch, then it expanded briefly into an antigravity phase during which gravity behaved like a repulsive force, then it contracted again to a big crunch followed with a big bang thus reaching an expansion phase in which we live now.  
Research Keywords 

2Tphysics, superstring theory, standard model of elementary particles, unification of forces, cosmology, black holes, supersymmetry  
Research Specialties 

http://physics1.usc.edu/~bars/  
Publications 

Book 

Bars, I., Terning, J. (2010). Extra Dimensions in Space and Time. New York, NY: Springer.  
Bars, I. (2005). Quantum Mechanics. Quantum Mechanics  
Bars, I., Nemeschansky, D., Pilch, K., Saleur, H. M., Warner, N. P. (1996). Future Perspectives in String Theory. USA, UK, Singapore: World Scientific.  
Bars, I., Chodos, A., Tze, C. (1985). Symmetry in Particle Physics. N.Y.: Plenum.  
Book Chapter 

Bars, I. (2013). Traversing Cosmological Singularities, Complete Journeys Through Spacetime Including Antigravity. Beyond the Big Bang Springer. arXiv:1209.1068  
Bars, I. (2006). Lectures on twistors. (Vol. Vol.2). pp. page 487. Quantum Theory and Symmetries/Heron Press. Lectures on twistors  
Cited Research 

Bars, I. (2010). Super YangMills theory in 10+2 dimensions, The 2Tphysics Source for N=4 SYM and M(atrix) Theory. High Energy Physics archive at Spires. arXiv:1008.4761  
Journal Article 

Bars, I., Rychkov, D. (2014). Is String Interaction the Origin of Quantum Mechanics?. Physics Letters B.  
Bars, I., Steinhardt, P., Turok, N. (2014). Dynamical string tension in string theory with spacetime Weyl invariance. Fortschritte der Physik. Vol. 62 (1112), pp. 901920.  
Bars, I., Rychkov, D. (2014). Background Independent String Field Theory. Physical Review D. arXiv:1407.4699  
Bars, I., Steinhardt, P., Turok, N. (2014). Local Conformal Symmetry in Physics and Cosmology. Physical Review. Vol. Phys. Rev. D89, pp. 043515043530. arXiv:1307.1848  
Bars, I., Steinhardt, P., Turok, N. (2013). Sailing through the big crunchbig bang transition. Physical Review. arXiv:1312.0739  
Bars, I., Araya, I. (2013). Generalized Dualities in 1TPhysics as Holographic Predictions from 2TPhysics. Physical Review. arXiv:1311.4205  
Bars, I., Steinhardt, P., Turok, N. (2013). Cyclic Cosmology, Conformal Symmetry and the Metastability of the Higgs. Physics Letters. Vol. B726, pp. 5055. arXiv:1307.8106  
Bars, I., Chen, S., Steinhardt, P., Turok, N. (2012). Complete Set of Homogeneous Isotropic Analytic Solutions in ScalarTensor Cosmology with Radiation and Curvature. Physical Review. Vol. D86, pp. 083542. arXiv:1207.1940  
Bars, I., Chen, S., Turok, N., Steinhardt, P. (2012). Antigravity and the big crunch/big bang transition. Physics Letters. Vol. B715, pp. 278281. antigravity  
Bars, I., Chen, S. (2011). The Big Bang and Inflation United by an Analytic Solution. Physical Review. Vol. D83, pp. 043522.  
Bars, I., Chen, S., Turok, N. (2011). Geodesically Complete Analytic Solutions for a Cyclic Universe. Physical Review. Vol. D84, pp. 083513.  
Bars, I. (2010). Gauge Symmetry in Phase Space, Consequences for Physics and Spacetime. Int.J.Mod.Phys.. Vol. A25, pp. 52355252.  
Bars, I. (2010). Constraints on Interacting Scalars in 2T Field Theory and No Scale Models in 1T Field Theory. Physical Review. Vol. D82, pp. 125025.  
Bars, I. (2009). Relativistic Harmonic Oscillator Revisited. Physical Review. Vol. D79, pp. 045009. http://arxiv.org/abs/0810.2075  
Bars, I., Chen, S. (2009). Geometry and Symmetry Structures in 2T Gravity. Physical Review. Vol. D79, pp. 085021. http://arxiv.org/abs/0811.2510  
Bars, I., Kuo, Y. (2008). N=2,4 Supersymmetric Gauge Field Theory in 2Tphysics. Physical Review. Vol. D79 (2009) 025001 arXiv:0808.0537 [hepth]  
Bars, I. (2008). Gravity in 2TPhysics. Physical Review. Vol. D77 (2008) 125027 arXiv:0804.1585 [hepth]  
Bars, I., Quelin, G. (2008). Dualities among onetime field theories with spin, emerging from a unifying twotime field theory. Physical Review. Vol. D77 (2008) 125019 arXiv:0802.1947 [hepth]  
Bars, I. (2007). The standard model as a 2Tphysics theory. American Physical Society/SUSY06/. Vol. AIP Conf.Proc.903 (2007) 550; hepth/0610187  
Bars, I., Kuo, Y. (2007). Field theory in 2Tphysics with N = 1 supersymmetry. Physical Review Letters. Vol. 99 (2007) 041801  
Bars, I. (2006). The standard model of particles and forces in the framework of 2Tphysics. Physical Review. Vol. D74 (2006) 085019; hepth/0606045  
Bars, I. (2004). Twistor superstring in 2Tphysics. Physical Review. Vol. D70 (2004) 104022; hepth/0407239  
Bars, I. (2001). Map of Witten's star, To Moyal's star. Physics Letters. Vol. B517 (2001), pp. 436444. hepth/0106157  
Bars, I. (2001). Survey of Two Time Physics,. Classical and Quantum Gravity. Vol. 18 (2001) 3113; hepth/0008164  
Bars, I., Deliduman, C., Minic, D. (1999). Lifting Mtheory to Two Time Physics. Physics Letters. Vol. B457 (1999) 275; hepth/9904063  
Proceedings 

Bars, I. (2011). Geodesically Complete Universe. Physics Archives.  
Research Report 

Bars, I. (2010). Hunting for TeV Scale Strings at the LHC. arXiv:1008.2379 [hepph].  
Honors and Awards 

Fellow (or Equivalent) of National Society in Discipline, Fellow, American Physical Society, 1/1/1988  
Residency at the Institute for Advanced Study, Member, 19901991  
First Award by Gravity Research Foundation, 1988  
NIH/NSF Career Development Award, Department of Energy Outstanding Junior Investigator, 19831984  
Residency at the Institute for Advanced Study, Member, 19791980  
Sloan Research Fellowship Recipient, 19761980  
Fulbright Award, Fellowship, 19641967  
Service to the University 

Administrative Appointments 

Director of the Caltech  USC Center for Theoretical Physics, 09/01/199906/30/2003  
Service to the Profession 

Committees 

Member, Americal Physical Society Committee for the Dannie Heinemann Prize, awarded for Mathematical Physics, 05/01/200712/31/2008  
Professional Memberships 

American Physical Society, 01/01/1969  
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