2009/07/20 by M. B. Altaie, U. Al-Ahmad, Usama al-Ahmad · 1 citation
Physics and Astronomy · #Adiabatic process #Advanced Thermodynamics and Statistical Mechanics #Back-reaction #Big Rip #Black Holes and Theoretical Physics #Classical mechanics #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #De Sitter universe #Inflation (cosmology) #Metric expansion of space #Physics #Quantum #Quantum cosmology #Quantum fluctuation #Quantum gravity #Quantum mechanics #Steady State theory #Theoretical physics #Universe #Vacuum energy #Vacuum state #Zero-energy universe #gr-qc
paper · pdf · doi:10.1007/s10773-011-0860-5
published in International Journal of Theoretical Physics 50(11), 3521-3528 (Springer Science+Business Media) · 28 pages, 4 figures
arxiv created 2009/07/20 · openalex publication_date 2011/06/22 · arxiv updated 2011/10/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We construct a model for the universe based on the existence of quantum fields at finite temperature in the background of Robertson-Walker spacetime in presence of a non-zero cosmological constant. We discuss the vacuum regime in the light of the results obtained through previous studies of the back-reaction of massless quantum fields in the static Einstein universe, and we argue that an adiabatic vacuum state and thermal equilibrium is achieved throughout this regime. Results shows that such a model can explain many features of the early universe as well as the present universe. The model is free from the basic problems of the standard Friedmann cosmology, and is non-singular but involves a continuous creation of energy at a rate proportional to the size of the universe, which is lower than that suggested by the steady-state cosmology.