what is the difference between emission and absorbtion spectrum ?? how and when the electron move from a higher level in the atom to a lower one or vice versa? ..thank u

Professor Rob Leigh received his bachelor's degree in theoretical physics from the University of Guelph in 1986, and his PhD in theoretical particle physics, from the University of Texas at Austin in 1991. He held postdoctoral research appointments at the Institute for Particle Physics at the University of California, Santa Cruz and at Rutgers University. He joined the Department of Physics at Illinois in 1996. He has done outstanding work in string theory, supersymmetric field theory, and other topics in particle physics and early Universe cosmology. Professor Leigh's work lies at the heart of current efforts to build a fundamental theory of matter, including quantum gravity effects.

In his first papers, Professor Leigh discovered D-branes and orientifolds in string theory and the first example of superstring duality, and derived the Dirac-Born-Infeld action describing the dynamics of D-branes. D-branes correspond to non-perturbative states unique to string theory and are analogous to magnetic monopoles in field theory. The study of D-branes is fundamental to modern string theory and its applications to particle physics, mathematics and condensed matter physics.

Professor Leigh has also done seminal work on the existence of conformal field theories, and the use of intersecting branes and branes at singularities in particle physics model building. His current research interests include the application of holographic string theory methods to study particle physics, gravity and condensed matter physics.

Primarily, we use gauge/gravity dualities (or holography) to study the physics of strongly coupled gauge theories and, increasingly, the strong coupling dynamics in condensed matter systems.

- Fellow, American Physical Society, 2007
- Arnold O. Beckman Award, UIUC, December 2004
- Outstanding Junior Investigator, DOE, 1997-2000

**Spring 2014:**PHYS 598**Fall 2013:**PHYS 598**Spring 2006:**PHYS 487**Spring 2005:**PHYS 487**Fall 2003:**PHYS 498

- T Andrade, J.I Jottar, R.G Leigh. Boundary conditions and unitarity: the Maxwell-Chern-Simons system in AdS3/CFT2. JHEP-Journal of High Energy Physics 2012:5, 071-117 (May 2012).
- I. Bah, A. Faraggi, J.I. Jottar and R.G. Leigh. Fermions and type IIB supergravity on squashed Sasaki-Einstein manifolds. JHEP-Journal of High Energy Physics, v 2011, n 1, p 100 (36 pp.), Jan. 2011
- I. Bah, A. Faraggi, J.I. Jottar, R.G. Leigh and L.A. Pando Zayas. Fermions and D = 11 supergravity on squashed Sasaki-Einstein manifolds. JHEP-Journal of High Energy Physics, v 2011, n 2, p 068 (29 pp.), Feb. 2011
- Mohammad Edalati, Juan I. Jottar, and Robert G. Leigh . Holography and the sound of criticality. JHEP-Journal of High Energy Physics, v 2010, n 10, p 058 (33 pp.), Oct. 2010
- M. Edalati, R.G. Leigh and P.W. Phillips, Dynamically Generated Gap from Holography: Mottness from a Black Hole, Phys. Rev. Lett. 106 (2011) 091602, arXiv:1010.3238.
- R.G. Leigh, A. Mauri, D. Minic and A.C. Petkou, Gauge Fields, Membranes and Subdeterminant Vector Models, arXiv:1002.2437, Phys. Rev. Lett. 104:221801,2010.
- M. Edalati, J.I. Jottar and R.G. Leigh, Shear Modes, Criticality and Extremal Black Holes, arXiv:1001.0779, JHEP 1004:075, 2010.
- R.G. Leigh and N. Nguyen Hoang, Fermions and the Sch/nrCFT Correspondence, arXiv: 0909.1883, JHEP 1003:027, 2010.
- S. Dong, E. Fradkin, R.G. Leigh, S. Nowling. Topological Entanglement Entropy in Chern-Simons Theories and Quantum Hall Fluids. JHEP
**0805**, 016 (2008). - R.G. Leigh, P. Phillips, T.-P. Choy. Hidden charge 2e boson in doped Mott Insulators. Phys. Rev. Lett.
**99**, 046404 (2007). - D. Berenstein, V. Jejjala, and R.G. Leigh. Standard model on a D-brane. Phys. Rev. Lett.
**88**, 071602 (2002). - D. Berenstein and R.G. Leigh. Resolution of stringy singularities by non-commutative algebras. JHEP-Journal of High Energy Phys.
**0106**, 030 (2001). - M. Berkooz, M.R. Douglas, and R.G. Leigh. Branes intersecting at angles. Nucl. Phys. B
**480**, 265 (1996). - R. G. Leigh and M. Strassler. Exactly marginal operators and duality in four dimensional N=1 supersymmetric gauge theory. Nucl. Phys. B
**447**, 95 (1995). - K. Intriligator, R.G. Leigh, and N. Seiberg. Exact superpotentials in four dimensions. Phys. Rev. D
**50**, 1092 (1994). - M. Dine, P. Huet, R.G. Leigh, A. Linde, and D. Linde. Towards the theory of the electroweak phase transition. Phys. Rev. D
**46**, 550 (1992). - R.G. Leigh. Dirac-Born-Infeld action from Dirichlet s-model. Mod. Phys. Lett. A
**4**, 2767 (1989). - J. Dai, R.G. Leigh, and J.G. Polchinski. New relations between string theories. Mod. Phys. Lett. A
**4**, 2073 (1989).

**Office**

431 Loomis Laboratory

**Phone**

217.265.0314

**Fax**

217.333.4990

**Email**

rgleigh@illinois.edu

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