2 papers
astro-ph.CO2024
From de Sitter to de Sitter: A Thermal Approach to Running Vacuum Cosmology and the Non-Canonical Scalar Field Description
P. E. M. Almeida, R. C. Santos, J. A. S. Lima
The entire classical cosmological history between two extreme de Sitter vacuum solutions is discussed based on Einstein's equations and non-equilibrium thermodynamics. The initial…
astro-ph2004
The Existence of an Old Quasar at and its Implications for Deflationary Cosmologies
J. V. Cunha, R. C. Santos
We investigate some observational constraints on decaying vacuum cosmologies based on the recently discovered old high redshift quasar APM 08279+5255. This object is located at $z…