Bharat Ratra
Bharat Vishnu Ratra (born January 26, 1960 in Mumbai ) is an Indian-American astrophysicist and cosmologist.
Ratra studied physics at the Indian Institute of Technology with a bachelor's degree in 1982 and received her doctorate in 1986 with Michael Peskin and Leonard Susskind at Stanford University . He was a post-doctoral student at the Stanford Linear Accelerator Center , Princeton University , the California Institute of Technology, and the Massachusetts Institute of Technology . In 1996 he became an Assistant Professor, 2001 Associate Professor and 2004 Professor at Kansas State University . He is a Distinguished Professor there.
In 1988 he and James Peebles investigated a cosmology with a temporally variable scalar field, which is a forerunner of the quintessence model that emerged in the late 1990s as part of the discovery of the acceleration of the universe and the first dynamic model of dark energy . In 1985, together with Willy Fischler and Leonard Susskind, he published the first consistent semiclassical calculation of the spectrum of fluctuations in energy density in cosmic background radiation.
He is a Fellow of the American Physical Society (2000) and the American Association for the Advancement of Science (2005). Ratra received a Career Award from the National Science Foundation in 1999.
Fonts
- with W. Fischler, L. Susskind: Quantum Mechanics of Inflation, Nucl. Phys. B, Vol. 259, 1985, p. 730
- with Peebles: Cosmological consequences of a rolling homogeneous scalar field, Physical Review D, Volume 37, 1988, p. 3406
- with Peebles: Cosmology with a time-variable cosmological'constant, Astrophysical Journal, Volume 325, 1988, L17-L20
- Cosmological 'seed' magnetic field from inflation, Astroph. J. Volume 391, 1992, L1-L4
- with Peebles: The cosmological constant and dark energy, Rev. Mod. Phys., Volume 75, 2003, p. 559, Arxiv
- with Omer Farooq: Hubble parameter measurement constraints on the cosmological deceleration-acceleration transition redshift, Astroph. J., Volume 766, 2013, L 7
Web links
| personal data | |
|---|---|
| SURNAME | Ratra, Bharat |
| ALTERNATIVE NAMES | Ratra, Bharat Vishnu |
| BRIEF DESCRIPTION | Indian astrophysicist |
| DATE OF BIRTH | January 26, 1960 |
| PLACE OF BIRTH | Mumbai |