Reheating after relaxation of large cosmological constant

被引:0
作者
Martens, Paul [1 ]
Mukohyama, Shinji [1 ,2 ]
Namba, Ryo [3 ]
机构
[1] Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys & Quantum Informat, Kyoto 6068502, Japan
[2] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan
[3] RIKEN Interdisciplinary Theoret & Math Sci iTHEMS, Wako, Saitama 3510198, Japan
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2022年 / 11期
关键词
dark energy theory; cosmology of theories beyond the SM; physics of the early universe; modified gravity;
D O I
10.1088/1475-7516/2022/11/047
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a cosmological model of an early-time scenario that incorporates a relaxation process of the would-be large vacuum energy, followed by a reheating era connecting to the standard hot big bang universe. Avoiding fine-tuning the cosmological constant is achieved by the dynamics of a scalar field whose kinetic term is modulated by an inverse power of spacetime curvature [1, 2]. While it is at work against radiative corrections to the dark energy, this mechanism alone would wipe out not only the vacuum energy but also all other matter contents. Our present work aims to complete the scenario by exploiting a null-energy-condition violating sector whose energy is eventually transferred to a reheating sector. We provide an explicit example of this process and thus a concrete scenario of the cosmic onset that realizes the thermal history of the Universe with a negligible cosmological constant.
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页数:31
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