标量-张量热力学的隐形亚稳态
Stealth metastable state of scalar-tensor thermodynamics
摘要：
研究了近期标量-张量引力热力学中的一个难题，其中广义相对论是零温平衡态，标量-张量引力是有效耗散流体的非平衡位形.本文证明了具有恒定正温度的Brans-Dicke引力隐形解类似于有效流体的亚稳态，并具有不稳定性。稳定性分析采用了一个版本的Bardeen-Ellis-Bruni-Hwang规范不变形式主义的宇宙学扰动适应修改后的重力。亚稳态被张量扰动破坏。
英文摘要：
We investigate a puzzle in the recent thermodynamics of scalar-tensor gravity, in which general relativity is a zero-temperature state of equilibrium and scalar-tensor gravity is the non-equilibrium configuration of an effective dissipative fluid. A stealth solution of Brans-Dicke gravity with constant positive temperature is shown to be analogous to a metastable state for the effective fluid and to suffer from an instability. The stability analysis employs a version of the Bardeen-Ellis-Bruni-Hwang gauge-invariant formalism for cosmological perturbations adapted to modified gravity. The metastable state is destroyed by tensor perturbations.
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