2011/05/17 by Bikash Chandra Paul, Paul, B. C., Partha Sarathi Debnath +1
Earth and Planetary Sciences · Physics and Astronomy · #83F05 #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements
paper · pdf · doi:10.48550/arxiv.1105.3307
openalex publication_date 2011/05/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study evolution of a flat Friedmann-Robertson Walker universe filled with a bulk viscous cosmological fluid in a higher derivative theory of gravity in the presence of time varying gravitational and cosmological constant. Cosmological models admitting both power-law and exponential expansions are explored here in the presence of imperfect fluid described by full Israel and Stewart theory. We note some new and interesting cosmological solutions relevant for model building including present accelerating phase. In the case of power law, it is found that gravitational constant increases as the time evolves for a positive cosmological constant whereas it decreases for a negative cosmological constant. The evolution of temperature of a viscous universe is also determined.