Ph.D. Stanford University, 1986
M.S. Indian Institute of Technology, New Delhi, 1982
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.
- Department of Energy
- National Science Foundation
- Shulei Cao, PhD
- Narayan Khadka, PhD
Recent Selected Publications
Shulei Cao, Joseph Ryan, and Bharat Ratra (2021). Using Pantheon and DES supernova, baryon acoustic oscillation, and Hubble parameter data to constrain the Hubble constant, dark energy dynamics, and spatial curvature. Mon. Not. Roy. Astron. Soc. 504 (2021) 1, 300-310. [link]
Narayan Khadka and Bharat Ratra (2021). Determining the range of validity of quasar X-ray and UV flux measurements for constraining cosmological model parameters. Mon. Not. Roy. Astron. Soc. 502 (2021) 4, 6140-6156. [link]
Joseph Ryan, Yun Chen, and Bharat Ratra (2019). Baryon acoustic oscillation, Hubble parameter, and angular size measurement constraints on the Hubble constant, dark energy dynamics, and spatial curvature. Mon. Not. Roy. Astron. Soc. 488 (2019) 3, 3844-3856. [link]
Chan-Gyung Park and Bharat Ratra (2018). Observational constraints on the tilted spatially-flat and the untilted nonflat CDM dynamical dark energy inflation models. Astrophys. J. 868 (2018) 2, 83. [link]
Hai Yu, Bharat Ratra, and Fa-Yin Wang (2018). Hubble Parameter and Baryon Acoustic Oscillation Measurement Constraints on the Hubble Constant, the Deviation from the Spatially Flat ΛCDM Model, the Deceleration–Acceleration Transition Redshift, and Spatial Curvature. Astrophys. J. 856 (2018) 1, 3. [link]