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arXiv 2003.10154gr-qcastro-ph.COhep-th
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玻尔兹曼的$H$定理、熵和引力强度在物质和几何之间的非最小耦合理论中

Boltzmann's $H$-theorem, entropy and the strength of gravity in theories with a nonminimal coupling between matter and geometry

P. P. Avelino, R. P. L. Azevedo

摘要:

在本文中,我们证明了玻尔兹曼的$H$ -定理并不一定成立的背景下,引力理论与非最小耦合的物质场。我们发现违反玻尔兹曼的$H$定理的充分条件,并推导出玻尔兹曼的$H$在非最小耦合函数方面的演化表达式,有效的情况下,在均匀和各向同性的Friedmann-Lemaitre-Robertson-Walker宇宙中的无碰撞气体。我们强调了这一结果的影响的熵的物质场的演化,简要讨论了粒子之间的碰撞所发挥的作用,每当他们是相关的。我们还提出了在这些理论的背景下,宇宙的高熵和引力的弱性之间可能存在的联系。

英文摘要:

In this paper we demonstrate that Boltzmann's $H$-theorem does not necessarily hold in the context of theories of gravity with nonminimally coupled matter fields. We find sufficient conditions for the violation of Boltzmann's $H$-theorem and derive an expression for the evolution of Boltzmann's $H$ in terms of the nonminimal coupling function, valid in the case of a collisionless gas in a homogeneous and isotropic Friedmann-Lemaître-Robertson-Walker universe. We highlight the implications of this result for the evolution of the entropy of the matter fields, briefly discussing the role played by collisions between particles whenever they are relevant. We also suggest a possible link between the high entropy of the Universe and the weakness of gravity in the context of these theories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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