Onset of dark energy from cosmological scalarization and gravitational wave speed

IF 2.8 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
H. Mohseni Sadjadi
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引用次数: 0

Abstract

This study investigates the emergence of dark energy during the matter-dominated era through spontaneous cosmological scalarization in the scalar-Ricci-Gauss-Bonnet model. Our model aligns with the conjecture that the speed of gravitational waves at low redshifts is nearly equal to the speed of light, implying that the Gauss-Bonnet invariant does not directly contribute to late-time acceleration and suggesting that scalarization begins in the radiation-dominated era. The Gauss-Bonnet coupling stabilizes the quintessence field at an initial fixed point with negligible dark energy density during the radiation era. As the Universe expands, the Ricci coupling induces a tachyonic transition in the quintessence field, driving the evolution of dark energy.

暗能量从宇宙尺度化和引力波速度开始
本研究通过标量-里奇-高斯-邦尼特模型中的自发宇宙学标化研究了物质主导时代暗能量的出现。我们的模型与引力波在低红移时的速度几乎等于光速的猜想一致,这意味着高斯-博内不变量并不直接导致晚时间的加速,并表明尺度化始于辐射主导的时代。在辐射时代,高斯-邦纳耦合使精萃场稳定在初始固定点,暗能量密度可忽略不计。随着宇宙的膨胀,利玛窦耦合在精粹场中引发了速子跃迁,推动了暗能量的演化。
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来源期刊
General Relativity and Gravitation
General Relativity and Gravitation 物理-天文与天体物理
CiteScore
4.60
自引率
3.60%
发文量
136
审稿时长
3 months
期刊介绍: General Relativity and Gravitation is a journal devoted to all aspects of modern gravitational science, and published under the auspices of the International Society on General Relativity and Gravitation. It welcomes in particular original articles on the following topics of current research: Analytical general relativity, including its interface with geometrical analysis Numerical relativity Theoretical and observational cosmology Relativistic astrophysics Gravitational waves: data analysis, astrophysical sources and detector science Extensions of general relativity Supergravity Gravitational aspects of string theory and its extensions Quantum gravity: canonical approaches, in particular loop quantum gravity, and path integral approaches, in particular spin foams, Regge calculus and dynamical triangulations Quantum field theory in curved spacetime Non-commutative geometry and gravitation Experimental gravity, in particular tests of general relativity The journal publishes articles on all theoretical and experimental aspects of modern general relativity and gravitation, as well as book reviews and historical articles of special interest.
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