Paul Steinhardt

Paul J. Steinhardt
At the 2008 World Science Festival in New York City
Born	December 25, 1955
Residence	U.S.
Fields	Physics
Institutions	Princeton University University of Pennsylvania Harvard Society of Fellows Harvard University California Institute of Technology
Doctoral advisor	Sidney Coleman
Known for	Cosmic inflation, Cyclic Model, Ekpyrotic universe, Quintessence, Quasicrystals

Paul J. Steinhardt is the Albert Einstein Professor of Science at Princeton University and a professor of theoretical physics. He received his B.S. at the California Institute of Technology and his Ph.D. in Physics at Harvard University. He was a Junior Fellow in the Harvard Society of Fellows and Mary Amanda Wood Professor of Physics at the University of Pennsylvania before joining the faculty at Princeton University in 1998. He is currently the Director of the Princeton Center for Theoretical Science.

He is best known for his work in theoretical cosmology, where he helped develop the theory of cosmic inflation, which attempts to explain the homogeneity and geometry of the universe and the origin of the fluctuations that seeded the formation of galaxies and large-scale structure. He introduced the concept of quintessence, a time-varying form of dark energy to explain the current accelerating expansion of the universe. His recent work has been on brane cosmology, especially the ekpyrotic and cyclic models. The cyclic theory of the universe is a radical alternative to big bang/inflationary cosmology in which the evolution of the universe is periodic and the key events shaping the large scale structure of the universe occur before the big bang.

Steinhardt also works in condensed matter physics, where he introduced the concept of quasicrystals, a novel phase of matter which has symmetries forbidden to ordinary periodic crystals. He has made numerous contributions to understanding their mathematical and physical properties. Recently, he has helped develop a photonic quasicrystal (the quasicrystal analogue of a photonic crystal) for efficiently trapping and manipulating light in selected wavebands.

He is a Fellow in the American Physical Society and a member of the National Academy of Sciences. In 2002, he received the P.A.M. Dirac Medal from the International Centre for Theoretical Physics.

See also

• Girih tiles

Homepage

• Princeton homepage

References

• P. J. Steinhardt and N. Turok, A cyclic model of the universe, Science 296, 1436(2002) arXiv:hep-th/0111098.
• P. J. Steinhardt and N. Turok, Endless Universe: Beyond the Big Bang, (Doubleday, 2007)
• J. Khoury, B. A. Ovrut, P. J. Steinhardt and N. Turok, "The ekpyrotic universe: Colliding branes and the origin of the hot big bang", Phys. Rev. D 64, 123522 (2001) arXiv:hep-th/0103239.
• D. N. Spergel and P. J. Steinhardt, "Observational evidence for self-interacting cold dark matter", Phys. Rev. Lett. 84, 3760 (2000) arXiv:astro-ph/9909386.
• N. A. Bahcall, J. P. Ostriker and P. J. Steinhardt, "The Cosmic Triangle: Revealing the State of the Universe", Science 284, 1481 (1999) arXiv:astro-ph/9906463.
• R. R. Caldwell, R. Dave and P. J. Steinhardt, "Cosmological Imprint of an Energy Component with General Equation-of-State", Phys. Rev. Lett. 80, 1582 (1998) arXiv:astro-ph/9708069.
• P. J. Steinhardt and S. Ostlund, The Physics of Quasicrystals (World Scientific, Singapore, 1987).
• J. M. Bardeen, P. J. Steinhardt and M. S. Turner, "Spontaneous Creation Of Almost Scale-Free Density Perturbations In An Inflationary Universe," Phys. Rev. D 28, 679 (1983).
• A. Albrecht and P. J. Steinhardt, "Cosmology For Grand Unified Theories With Radiatively Induced Symmetry Breaking," Phys. Rev. Lett. 48, 1220 (1982).