Energy stored on a cosmological horizon and its thermodynamic fluctuations in holographic equipartition law

小松, 信義; Komatsu, Nobuyoshi

doi:10.1103/PhysRevD.105.043534

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Energy stored on a cosmological horizon and its thermodynamic fluctuations in holographic equipartition law

https://doi.org/10.24517/00065476

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TE-PR-KOMATSU-N-105-043534.pdf (407.4 kB)

Item type

学術雑誌論文 / Journal Article(1)

公開日

2022-02-25

タイトル

Energy stored on a cosmological horizon and its thermodynamic fluctuations in holographic equipartition law

言語

eng

資源タイプ

資源タイプ識別子

http://purl.org/coar/resource_type/c_6501

資源タイプ

journal article

ID登録

10.24517/00065476

ID登録タイプ

JaLC

著者

Komatsu, Nobuyoshi

WEKO 459
e-Rad 20436827
金沢大学研究者情報 20436827
研究者番号 20436827

	Komatsu, Nobuyoshi

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著者別表示

小松, 信義

提供者所属

内容記述タイプ

Other

内容記述

金沢大学理工研究域機械工学系

書誌情報

Physical Review D
en : Physical review. Third series. D, Particles and fields

巻 105, 号 4, p. 043534, 発行日 2022-02-23

ISSN

収録物識別子タイプ

ISSN

収録物識別子

2470-0010

ISSN

収録物識別子タイプ

ISSN

収録物識別子

2470-0029

NCID

収録物識別子タイプ

NCID

収録物識別子

AA00773624

DOI

関連識別子

10.1103/PhysRevD.105.043534

出版者

American Physical Society

抄録

内容記述タイプ

Abstract

内容記述

Our Universe is expected to finally approach a de Sitter universe whose horizon is considered to be in thermal equilibrium. In the present article, both the energy stored on the horizon and its thermodynamic fluctuations are examined through the holographic equipartition law. First, it is confirmed that a flat Friedmann-Robertson-Walker universe approaches a de Sitter universe, using a cosmological model close to lambda cold dark matter models. Then, based on the holographic equipartition law, the energy density of the Hubble volume is calculated from the energy on the Hubble horizon of a de Sitter universe. The energy density for a de Sitter universe is constant and the order of the energy density is consistent with the order of that for the observed cosmological constant. Second, thermodynamic fluctuations of energy on the horizon are examined, assuming stable fluctuations around thermal equilibrium states. A standard formulation of the fluctuations for a canonical ensemble is applied to the Hubble horizon of a de Sitter universe. The thermodynamic fluctuations of the energy are found to be a universal constant corresponding to the Planck energy, regardless of the Hubble parameter. In contrast, the relative fluctuations of the energy can be characterized by the ratio of the one-degree-of-freedom energy to the Planck energy. At the present time, the order of the relative fluctuations should be within the range of a discrepancy derived from a discussion of the cosmological constant problem, namely, a range approximately from 10−60 to 10−123. The present results may imply that the energy stored on the Hubble horizon is related to a kind of effective dark energy, whereas the energy that can be “maximally” stored on the horizon may behave as if it were a kind of effective vacuum-like energy in an extended holographic equipartition law.

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権利情報

著者版フラグ

出版タイプ

VoR

出版タイプResource

http://purl.org/coar/version/c_970fb48d4fbd8a85

関連識別子

http://prd.aps.org/