Dynamical cosmological term in modified gravity

✍ Scribed by J. Solà

• Book ID: 105357938
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 227 KB
• Volume: 59
• Category: Article
• ISSN: 0015-8208
• DOI: 10.1002/prop.201100051

✦ Synopsis

Abstract

The experimental evidence that the equation of state (EoS) of the dark energy (DE) could be evolving with time, suggests that the Λ‐term in the gravity action should rather be an effective quantity Λ~eff~(t) involving new dynamical terms X(t). Remarkably, a class of these ΛXCDM models could be the clue for solving the old cosmological constant problem, including the cosmic coincidence problem. We propose a permanent (i.e. not just a late‐time) modification of gravity which is able to account for these problems, and without affecting the standard cosmological evolution of the universe.