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Dynamical cosmological term in modified gravity
Author(s) -
Solà J.
Publication year - 2011
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/prop.201100051
Subject(s) - physics , dark energy , cosmological constant , theoretical physics , term (time) , lambda cdm model , coincidence , cosmic cancer database , equation of state , metric expansion of space , physical cosmology , action (physics) , cosmology , universe , mathematical physics , astrophysics , astronomy , quantum mechanics , medicine , alternative medicine , pathology
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.