Bharat Ratra
Professor
Address:	32A Cardwell Hall
Phone:	(785) 532-6265
E-mail:	ratra@phys.ksu.edu
Personal Webpage
Ph.D. Stanford University, 1986
M.S. Indian Institute of Technology, New Delhi, 1982

Research Area

Cosmology and Astroparticle Physics

Developing models for the large-scale matter and radiation distributions in the universe. Testing these models by comparing their predictions to observational data, including the anisotropy in the cosmic microwave background radiation, and the mass correlation function. 

We collaborate with the Kansas State University High Energy Physics Group.

Recent Support

• Department of Energy
• National Science Foundation

Recent Selected Publications

• L. Samushia and B. Ratra, “Constraining Dark Energy with Gamma-Ray Bursts,” Astrophys. J. 714, 1347 (2010).  

• L. Samushia and B. Ratra, “Constraints on Dark Energy Models from Radial Baryonic Acoustic Scale Measurements,” Astrophys. J. 701, 1373 (2009).  

• T. Kahniashvili, L. Campanelli, G. Gogoberidze, Y. Maravin, and B. Ratra, “Gravitational Radiation from Primordial Helical Inverse Cascade MHD Turbulence,” Phys. Rev. D  78, 123006 (2008).

•  T. Kahniashvili, G. Lavrelashvili, and  B. Ratra, “CMB Temperature Anisotropy from Broken Spatial Isotropy due to a Homogeneous Cosmological Magnetic Field,” Phys. Rev. D  78, 063012 (2008).  

• L. Samushia and B. Ratra, “Constraints on Dark Energy from Baryonic Acoustic Peak and Galaxy Cluster Gas Mass Fraction Measurements,” Astrophys. J. 703, 1904 (2009).

• L. Samushia and B. Ratra, “Constraints on Dark Energy from Galaxy Cluster Gas Mass Fraction versus Redshift Data,”  Astrophys. J. Lett. 680, L1 (2008).  

• T. Kahniashvili, G. Gogoberidze, and  B. Ratra, “Gravitational Radiation from Primordial Helical MHD Turbulence,"  Phys. Rev. Lett. 100, 231301 (2008).  

• B. Ratra and M.S. Vogeley, “The Beginning and Evolution of the Universe,”  Pub. Astron. Soc. Pacific 120, 235 (2008).