Modified cosmology models from thermodynamical approach
Chao-Qiang Geng, Yan-Ting Hsu, Jhih-Rong Lu, Lu Yin
Abstract
Abstract We apply the first law of thermodynamics to the apparent horizon of the universe with the power-law corrected and non-extensive Tsallis entropies rather than the Bekenstein–Hawking one. We examine the cosmological properties in the two entropy models by using the CosmoMC package. In particular, the first numerical study for the cosmological observables with the power-law corrected entropy is performed. We also show that the neutrino mass sum has a non-zero central value with a relaxed upper bound in the Tsallis entropy model comparing with that in the $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Λ</mml:mi></mml:math> CDM one.
Topics & Concepts
PhysicsTsallis entropyCosmologyEntropy (arrow of time)ObservableStatistical physicsTheoretical physicsNeutrinoCosmological modelApparent horizonUpper and lower boundsSecond law of thermodynamicsMaximum entropy thermodynamicsMathematical physicsHorizonUniverseH-theoremClassical mechanicsPrinciple of maximum entropyJoint quantum entropyLaws of thermodynamicsFirst law of thermodynamicsCosmology and Gravitation TheoriesStatistical Mechanics and EntropyNoncommutative and Quantum Gravity Theories