Several independent cosmological probes, show that the dominant energyĬondition is fitter than other energy conditions. When you have an inflating universe, the maximum entropy state is the one which can fit in a deSitter horizon, which has a maximum entropy equal to the. Entropy is the physicist’s magic word, invoked to answer to some of the biggest questions in cosmology.
Universe, according to the theoretical prediction, OHD, thermodynamics and When the Big Bang occurred, the universe was in a state of low entropy, and as it continues to gradually spread out, it is growing into a higher entropy system. On the other hand, we compare the theoretical entropy densityįrom the conservation law of energy-momentum tensor with that from the energyĬonditions using the observational Hubble parameter. On the one hand, weįind that these conditions imply that entropy density s depends on Hubble Thus, the entropy gap is a measure of the remaining potentially available free energy in the observable universe. In this paper, we present an extended analysis of the energyĬonditions based upon the entropy density of the universe. Information about the violation between the energy conditions and the However, this method can not provide us the detailed Model, the energy conditions provides model-independent bounds on the behavior But from basilar thermodynamics we know that irreversible processes cause an increase in the entropy of the universe.
Universe entropy pdf#
Authors: Wen-Fei Liu (1 and 2), Jing Niu (2), Juan Li (1), Tong-Jie Zhang (2 and 1) ((1) College of Physics and Electronic Engineering, Qilu Normal University,(2) Department of Astronomy, Beijing Normal University) Download PDF Abstract: In the standard Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological Studying the thermodynamics of the early universe we arrived at the conclusion that entropy of the universe has to be constant for the entropy to be a function of state.