首页/论文/2003.08416

arXiv 2003.084162020-03gr-qcastro-ph.COhep-phhep-th

Chiral Symmetry and the Cosmological Constant

Stephon Alexander, Gabriel Herczeg, Jinglong Liu, Evan McDonough

备注：: 10 pages, some typographical errors corrected, results unchanged
发表信息：: Phys. Rev. D 102, 083526 (2020)
DOI：: 10.1103/PhysRevD.102.083526

英文摘要：

In this work we provide a link between a nearly vanishing cosmological constant and chiral symmetry. This is accomplished with a modification of General Relativity coupled to a topological field theory, namely BF theory by introducing fermions charged under the BF theory gauge group. We find that the cosmological constant sources a chiral anomaly for the fermions, providing a `technical naturalness' explanation for the smallness of the observed cosmological constant. Applied to the early universe, we show that production of fermions during inflation can provide all the dark matter in the universe today, in the form of superheavy dark baryons.

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。

阅读原文

阅读 PDF ↗

arXiv 页面 ↗HTML 原文 ↗

本文内容

英文摘要相关论文

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。

继续探索

相关论文

宇宙对称性引力波背景幅度的上限

An upper limit on cosmological chiral gravitational wave background

研究推导了早期宇宙中左手引力波背景幅度的上限，揭示了其在高再加热温度下对宇称破坏物理的探测作用。

2026-03-06astro-ph.COgr-qchep-ph

Unified dark matter and dark energy description in a chiral cosmological model

We show the way of dark matter and dark energy presentation via ansatzs on the kinetic energies of the fields in the two-component chiral cosmological model. To connect a kinetic interaction of dark matter and dark energy with observational data the reconstruction procedure for the chiral metric component $h_{22}$ and the potential of (self)interaction $V$ has been developed. The reconstruction of $h_{22}$ and $V$ for the early and later inflation have been performed. The proposed model is confronted to $ΛCDM$ model as well.

2014-04-23astro-ph.COgr-qc

Consistent boundary conditions for cosmological topologically massive gravity at the chiral point

We show that cosmological topologically massive gravity at the chiral point allows not only Brown-Henneaux boundary conditions as consistent boundary conditions, but slightly more general ones which encompass the logarithmic primary found in 0805.2610 as well as all its descendants.

2010-10-28gr-qchep-th

Canonical analysis of cosmological topologically massive gravity at the chiral point

Wolfgang Kummer was a pioneer of two-dimensional gravity and a strong advocate of the first order formulation in terms of Cartan variables. In the present work we apply Wolfgang Kummer's philosophy, the `Vienna School approach', to a specific three-dimensional model of gravity, cosmological topologically massive gravity at the chiral point. Exploiting a new Chern-Simons representation we perform a canonical analysis. The dimension of the physical phase space is two per point, and thus the theory exhibits a local physical degree of freedom, the topologically massive graviton.

2008-06-25gr-qchep-th

标准宇宙学模型中来自手征等离子体不稳定性的遗迹引力波

Relic Gravitational Waves from the Chiral Plasma Instability in the Standard Cosmological Model

本文证明标准模型中的手征等离子体不稳定性可产生螺旋超磁场、磁流体湍流及极化遗迹引力波背景，且信号由初始手征不对称性这一单参数控制，并用三维模拟验证了能谱估算。

2024-05-08astro-ph.COgr-qchep-ph

Chiral Cosmological Models: Dark Sector Fields Description

The present review is devoted to a Chiral Cosmological Model as the self-gravitating nonlinear sigma model with the potential of (self)interactions employed in cosmology. The chiral cosmological model has successive applications in descriptions of the inflationary epoch of the Universe evolution; the present accelerated expansion of the Universe also can be described by the chiral fields multiplet as the dark energy in wide sense. To be more illustrative we are often addressed to the two-component chiral cosmological model. Namely, the two-component chiral cosmological model describing the pha…

2014-03-28gr-qc

更多相关论文收起更多论文

New Exact Solutions for a Chiral Cosmological Model in 5D EGB Gravity

We consider a chiral cosmological model in the framework of Einstein-Gauss-Bonnet cosmology. Using a decomposition of the latter equations in such a way that the first chiral field is responsible for the Einstein part of the model, while the second field together with the kinetic interaction is connected with the Gauss--Bonnet part of the theory, we find new exact solutions for the 2-component chiral cosmological model with and without the kinetic interaction between fields.

2017-04-19gr-qc

An Emergent Universe with Dark Sector Fields in a Chiral Cosmological Model

We consider the emergent universe scenario supported by a chiral cosmological model with two interacting dark sector fields: phantom and canonical. We investigate the general properties of the evolution of the kinetic and potential energies as well as the development of the equation of state with time. We present three models based on asymptotic solutions and investigate the phantom part of the potential and chiral metric components. The exact solution corresponding to a global emergent universe scenario, starting from the infinite past and evolving to the infinite future, has been obtained fo…

2013-12-06gr-qc

Chiral Symmetry Restoration through Hawking-Unruh Thermalization Effect

Comments on the chiral symmetry restoration through the Hawking-Unruh effect are given.

2005-09-19astro-phgr-qchep-ph

具有两个标量场的新型可积手征宇宙学模型

New Integrable Chiral Cosmological Models with Two Scalar Fields

本文构造了具有两个标量场且势能用双曲函数表示的可积手征宇宙学模型，通过度规共形变换和诱导引力项，在空间平坦、开放和闭合的 Friedmann 宇宙中获得了通解及运动积分，通解可用共形时间的 Jacobi 椭圆函数表示。

2024-10-31astro-ph.COgr-qcmath-ph

Instability in cosmological topologically massive gravity at the chiral point

We consider cosmological topologically massive gravity at the chiral point with positive sign of the Einstein-Hilbert term. We demonstrate the presence of a negative energy bulk mode that grows linearly in time. Unless there are physical reasons to discard this mode, this theory is unstable. To address this issue we prove that the mode is not pure gauge and that its negative energy is time-independent and finite. The isometry generators L_0 and \bar{L}_0 have non-unitary matrix representations like in logarithmic CFT. While the new mode obeys boundary conditions that are slightly weaker than t…

2009-10-22gr-qchep-th

挠率、引力诱导的手征对称性破缺与宇宙反弹

Torsion, Gravity Induced Chiral Symmetry Breaking and Cosmological Bounce

本文扩展基于手征凝聚违反零能量条件的宇宙反弹模型，通过曲率二阶旋量有效作用量阐明引力诱导凝聚机制，并引入新相互作用项以解释收缩期绝热扰动。

2024-03-02gr-qchep-th

Global dynamics of the hyperbolic Chiral-Phantom model

We perform a detailed analysis of the asymptotic behavior of a multifield cosmological model with phantom terms. Specifically, we consider the Chiral-Phantom model consisting of two scalar fields with a mixed kinetic term, while one scalar field has negative kinetic energy, that is, it has phantom properties. We show that the Hubble function can change sign, and we study the global evolution of the field equation in the finite and infinity regions with the use of Poincaré variables. We find that in the Chiral-Phantom model the limit of the quintessence scalar field is recovered while the cosmo…

2021-12-12gr-qchep-th

An Emergent Universe supported by chiral cosmological fields in Einstein--Gauss--Bonnet gravity

We propose the application of the chiral cosmological model (CCM) for the Einstein--Gauss--Bonnet (EGB) theory of gravitation with the aim of finding new models of the Emergent Universe (EmU) scenario. We analysed the EmU supported by two chiral cosmological fields for a spatially flat universe, while we have used three chiral fields when we investigated open and closed universes. To prove the validity of the EmU scenario we fixed the scale factor and found the exact solution by decomposition of EGB equations and solving the chiral field dynamics equation. To this end, we suggested the decompo…

2014-05-28gr-qc

$f(R,(\nabla R)^2,\square R)$引力的手征自引力模型的宇宙学解

Cosmological solutions of a chiral self-gravitating model of $f(R,(\nabla R)^2,\square R)$ gravity

本研究将修正$f(R,(\nabla R)^2,\u25a1R)$引力约化为带标量场的爱因斯坦引力并构造特殊手征自引力模型，在FRW时空中求得零势与常势下的多种宇宙学精确解。

2024-10-09gr-qc

统一暴胀与原初黑洞形成的手性宇宙学模型构建

Construction of Chiral Cosmological Models Unifying Inflation and Primordial Black Hole Formation

本文提出基于 Starobinsky $R+R^2$ 模型构建 $F(R,\xi)$ 引力的方法，证明双场手性模型势可由初等函数求得，并通过特殊选择统一描述暴胀与原初黑洞形成。

2024-01-22gr-qc