# The Department of Natural Sciences

## Ramzi Khuri

High Energy Physics

**Email:** Ramzi.Khuri@baruch.cuny.edu

**Phone:** (646)
660-6234

**Location: ** Rm 707A, 17 Lexington Ave

Ramzi Khuri received his PhD in Physics at Princeton University in 1991. He spent the past seven years as a researcher in theoretical physics. During (1991-93), he was a postdoctoral fellow at Texas A&M University. Another two years (1993-94 and 1995-96) were spent at CERN in Geneva, the leading high senergy physics research institute in the world, on a John Stuart Bell Scholarship in Quantum Physics. An additional two years (1994-95 and 1996-97) were spent as a research associate at McGill University. Most recently, he held a Particle Physics and Astronomy Research Council (PPARC) Advanced Fellowship at Queen Mary and Westfield College, University of London. This last position was at the rank of Lecturer, and was intended for five years to support unhindered research.

He resigned this position August 31st, 1998 in order to assume the tenure-track position at Baruch College. In the field of string theory, he has established an international reputation, having co-authored a review, which has now become a standard reference, and having published over 50 papers, receiving over 1,000 citations. In addition, he co-organized the conference *From Superstrings to Supegravity* at the Etorre Majorana Centre at Erice, Italy, in December 1992.

**Research**

"My research career has concentrated mainly on the study of black holes, solitons and duality in string theory. The main motivation in this endeavour is an attempt to understand the nature of string theory as a theory of quantum gravity and uniting the four fundamental interactions of nature. Such a unified picture emerges via the introduction of duality maps, which relate seemingly different theories in various limits, and in which these theories appear as different phases of the same underlying theory. More recently, I have focused on the attempt to understand the quantum statistical-mechanical basis of the Bekenstein-Hawking (BH) black hole entropy formula from string theory and to a resolution of the Hawking radiation information paradox. The BH formula was derived recently for certain classes of black holes. I am currently engaged in trying to understand the physical basis for the success of this derivation and the correspondence between black holes and quantum-mechanical string states, a problem which lies at the heart of quantum gravity. In particular, fascinating new connections arise between black holes and certain soft-matter (polymer) systems."

**Publications 1992-present**

Ramzi R. Khuri, James Liu, Feng Chen and Wenbiao Gan

The Universality of Physics: A Festschrift in Honor of Deng Feng Wang, the Proceedings of the Deng Feng Wang Memorial Conference, Princeton, NJ, August 12, 2000 Kluwer Academic/Plenum (2001)

Ramzi R. Khuri

Fundamental Strings and Cosmology Phys. Lett. B520 (2001) 353-356 (North-Holland).

Ramzi R. Khuri

Remarks on Black Hole Degrees of Freedom in String Theory Nucl. Phys. B617 (2001) 365-374 (North-Holland).

Ramzi R. Khuri

Supersymmetric Soliton Solutions in String Theory, in A Concise Encyclopedia of Supersymmetry, Editors Jonathan Bagger, Steven Duplij and Warren Siegel Kluwer Academic Publishers, January 2001.

Ramzi R. Khuri

Black Holes, String Theory and Fundamental Physics, To appear in the Proceedings of the Deng Feng Wang Memorial Conference, The Universality of Physics: A Festschrift in Honor of Deng Feng Wang, Editors Ramzi R. Khuri, James Liu, Wenbiao Gan and Feng Chen, Princeton, NJ, August 12, 2000 Kluwer Academic/Plenum (2001) (based on talk given at conference, August, 2000).

Ramzi R. Khuri

Entropy and String/Black Hole Correspondence Nucl. Phys. B588 (2000) 253-262 (North-Holland).

Chris M. Hull and Ramzi R. Khuri

Worldvolume Theories, Holography and Timelike Dualities, Nucl. Phys. B575 (2000) 231-254 (North-Holland).

Ramzi R. Khuri

Black Holes, Strings and Polymers, In General Relativity and Relativistic Astrophysics, Eighth Canadian Conference, Montreal, Quebec, Canada, June 1999, Editors C.P. Burgess and R.C. Myers, American Institute of Physics, AIP Conference Proceedings, Melville, NY, p.113-117 (based on talk given at conference, June 1999).

Ramzi R. Khuri

Black Holes, Thermodynamics and Polymers, In Proceedings of the Inaugural Conference Observing the Opening of The Center for Advanced Mathematical Sciences at the American University of Beirut, The Mathematical Sciences After the Year 2000: A Prospective View, Editors K. Bitar, A. Chamseddine and W. Sabra, January 1999, World Scientific, p.71-76 (based on talk given at conference, January, 1999).

Ramzi R. Khuri

Magnetic Spatial Geometry and the Wu-Yang Ambiguity in Proceedings of the Workshop on Gauge-Invariant Variables in Gauge Theories, RIKEN Brookhaven National Laboratories, Upton, NY, May, 1999 (based on talk given at workshop, May 1999).

Ramzi R. Khuri

Self-Gravitating Strings and String/Black Hole Correspondence, Phys. Lett. B470 (1999) 73-76 (North-Holland).

Chris M. Hull and Ramzi R. Khuri

Branes, Times and Dualities, Nucl. Phys. B536 (1999) 219-244 (North-Holland).

Chris M. Hull and Ramzi R. Khuri.

Branes Times and Dualities, hep-th/9808069, QMW-PH-98-37, CAMS/98-04 (to appear in Nucl. Phys. B)

Ramzi R. Khuri.

Black Holes and Strings: the Polymer Link, Mod. Phys. Lett. A13 (1998) 1407-1411.

Nemanja Kaloper, Ramzi R. Khuri and Robert C. Myers.

On Generalized Axionic Reductions, Phys. Lett. B428 (1998) 297-314.

Michael J. Duff, Jonathan M. Evans, Ramzi R. Khuri, Jianxin Lu and Ruben Minasian.

The Octonionic Membrane, Nucl. Phys. B (Proc. Suppl.) 68 (1998) 295-302.

Michael J. Duff, Jonathan M. Evans, Ramzi R. Khuri, Jianxin Lu and Ruben Minasian.

The Octonionic Membrane, Phys. Lett. B412 (1997) 281-287.

Ramzi R. Khuri.

Solitons, Black Holes and Duality in String Theory, Nucl. Phys. B (Proc. Suppl.) 61A (1998) 99-110, Proceedings of 33rd Karpacz Winter School of Theoretical Physics, Karpacz, Poland, 13-22 February 1997

Ramzi R. Khuri.

String Solitons and Black Hole Thermodynamics, hep-th/9709124, Proceedings of the 19th Annual MRST meeting Syracuse University, Syracuse, NY, May 12-13, 1997, 44-51.

Clifford V. Johnson, Ramzi R. Khuri and Robert C.Myers.

Entropy of 4D Extremal Black Holes, Phys. Lett. B378 (1996) 78-86.

Sergio Ferrara, Ramzi R. Khuri and Ruben Minasian.

M-Theory on a Calabi-Yau Manifold, Phys. Lett. B375 (1996) 81-88.

Ramzi R.Khuri and Tomas Ortin.

A Non-Supersymmetric Dyonic Extreme Reissner-Nordstrom Black Hole. Phys. Lett. B373 (1996) 56-60.

Ramzi R. Khuri and Tom'as Ortn.

Supersymmetric Black Holes in N=8 Supergravity, Nucl. Phys. B467 (1996) 355-398.

Ramzi R. Khuri and Robert C. Myers.

Rusty Scatter Branes, Nucl. Phys. B466 (1996) 60-74.

Clifford V. Johnson, Nemanja Kaloper, Ramzi R. Khuri and Robert C. Myers.

Is String Theory a Theory of Strings?, Phys. Lett. B368 (1996) 71-77.

Ramzi R. Khuri.

Supersymmetry, Duality and Bound States, Proceedings of Strings'96 Conference: "Current Trends in String Theory", Institute for Theoretical Physics, UCSB, July 15-20, 1996.

Ramzi R. Khuri and Robert C. Myers.

Dynamics of Extreme Black Holes and Massive String States, Phys. Rev. D52 (1995) 6988-6996.

Michael J. Duff, Sergio Ferrara, Ramzi R. Khuri and Joachim Rahmfeld.

Supersymmetry and Dual String Solitons, Phys. Lett. B356 (1995) 479-486.

Michael J. Duff, Ramzi R. Khuri and Jianxin Lu.

String Solitons, Physics Reports 259 Numbers 4&5 (1995) 213-326.

Ramzi R. Khuri.

Spacetime Supersymmetry and Duality in String Theory, Proceedings of 17th Annual MRST Meeting, Rochester University, Rochester, NY, May 8-9, 1995, 67-73.

Daniel Z. Freedman and Ramzi R. Khuri.

Spatial Geometry and the Wu-Yang Ambiguity, Proceedings of Gursey Memorial Conference I: "On Strings and Symmetries", Bogazici University, Istanbul, Turkey, June 6-10 1994, eds. G. Aktas, O. Akyuz, C. Saclioglu and M. Serdaroglu, Springer-Verlag (1995) 228-234.

Daniel Z. Freedman and Ramzi R. Khuri.

The Wu-Yang Ambiguity Revisited: New Degeneracies, Proceedings of PASCOS-94 Meeting, Syracuse University, Syracuse, NY, May 19-24, 1994, ed. K.C. Wali, World Scientific (1995) 370-380.

Michael J. Duff, Ramzi R. Khuri, Ruben Minasian and Joachim Rahmfeld.

Black Hole Solutions in String Theory, Proceedings of MRST-94 Meeting: "What Next ? Exploring the Future of High Energy Physics", McGill University, Montreal, Quebec, Canada, May 11-13, 1994, eds. J.R. Cudell, K.R. Dienes and B. Margolis, World Scientific (1995) 137-142.

Ramzi R. Khuri.

Black Holes and Solitons in String Theory, Helv. Phys. Acta 67 (1994) 884-922.

Daniel Z. Freedman and Ramzi R. Khuri.

The Wu-Yang Ambiguity Revisited, Phys. Lett. B329 (1994) 263-270.

Michael J. Duff, Ramzi R. Khuri, Ruben Minasian and Joachim Rahmfeld.

New Black Hole, String and Membrane Solutions of the Four-Dimensional Heterotic String, Nucl. Phys. B418 (1994) 195-205.

Michael J. Duff and Ramzi R. Khuri.

Four-Dimensional String/String Duality, Nucl. Phys. B411 (1994) 473-486.

Michael J. Duff, Sergio Ferrara and Ramzi R. Khuri.

Proceedings of the INFN Eloisatron Project, 26th Workshop: "From Superstrings to Supergravity", Erice, Italy, December 5-12, 1992 World Scientific (1994).

Michael J. Duff and Ramzi R. Khuri.

Four-Dimensional String/String Duality, Proceedings of the NATO Advanced Study Institute: "Cosmology and Particle Physics", Erice, Italy, May 1993, eds. de Sabbata and Tso-Hsiu, Kluwer Academic Publisher (1994).

Ramzi R. Khuri.

Classical String Solitons, Proceedings of the International Workshop: "Recent Advances in the Superworld", HARC, The Woodlands, TX, April 14-16, 1993, eds. J. Lopez, D. Nanopoulos and A. Zichichi, World Scientific (1994) 295-304.

Michael J. Duff and Ramzi R. Khuri.

Four-Dimensional String/String Duality, Proceedings of the INFN Eloisatron Project, 26th Workshop: "From Superstrings to Supergravity", Erice, Italy, December 5-12, 1992 eds. M. Duff, S. Ferrara and R. Khuri, World Scientific (1994) 58-70.

Ramzi R. Khuri.

Instantons, Monopoles, Strings and Fivebranes, Proceedings of the INFN Eloisatron Project, 26th Workshop: "From Superstrings to Supergravity", Erice, Italy, December 5-12, 1992 eds. M. Duff, S. Ferrara and R. Khuri, World Scientific (1994) 46-57.

Ramzi R. Khuri.

Remark on String Solitons, Phys. Rev. D48 (1993) 2947-2948.

Ramzi R. Khuri.

Veneziano Amplitude for Winding Strings, Phys. Rev. D48 (1993) 2823-2825.

Ramzi R. Khuri.

Classical Dynamics of Macroscopic Strings, Nucl. Phys. B403 (1993) 335-350.

Ramzi R. Khuri.

Geodesic Scattering of Solitonic Strings, Phys. Lett. B307 (1993) 302-304.

Ramzi R. Khuri.

A Comment on the Stability of String Monopoles, Phys. Lett. B307 (1993) 298-301.

Ramzi R. Khuri and HoSeong La.

String Motion in Fivebrane Geometry, Phys. Rev. D47 (1993) 570-577.

Ramzi R. Khuri.

Monopoles and Instantons in String Theory, Phys. Rev. D46 (1992) 4526-4532.

Ramzi R. Khuri.

A Heterotic Multimonopole Solution, Nucl. Phys. B387 (1992) 315-332.

Ramzi R. Khuri.

Scattering of String Monopoles, Phys. Lett. B294 (1992) 331-336.

Ramzi R. Khuri.

A Multimonopole Solution in String Theory, Phys. Lett. B294 (1992) 325-330.

Ramzi R. Khuri and HoSeong La.

Orbits of a String around a Fivebrane, Phys. Rev. Lett. 68 (1992) 3391-3393.

Michael J. Duff, Ramzi R. Khuri and Jianxin Lu.

String and Fivebrane Solitons: Singular or Non-singular?, Nucl. Phys. B377 (1992) 281-294.

Ramzi R. Khuri.

Manton Scattering of String Solitons, Nucl. Phys. B376 (1992) 350-364.

Ramzi R. Khuri.

Some Instanton Solutions in String Theory, Proceedings of XXth International Conference on Differential Geometric Methods in Theoretical Physics, Baruch College, CUNY, New York, NY, June 3-7, 1991, eds. S. Catto and A. Rocha, World Scientific (1992) 1074-1086.

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