Quantum cosmology, eternal inflation, and swampland conjectures
Quantum cosmology, eternal inflation, and swampland conjectures
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量子宇宙学、永恒膨胀和沼泽猜想
DOI:
10.1088/1475-7516/2023/04/034
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发表时间:
2023
影响因子:
6.4
通讯作者:
Vilenkin, Alexander
中科院分区:
文献类型:
--
作者:
Fanaras, Georgios;Vilenkin, Alexander
In light of the recent swampland conjectures, we explore quantum cosmology and eternal inflation beyond the slow roll regime. We consider a model of a closed universe with a scalar field ϕ in the framework of tunneling approach to quantum cosmology. The scalar field potential is assumed to have a maximum at ϕ= 0 and can be approximated in its vicinity as V (ϕ)≈ 3H 2-1/2m 2 ϕ 2. Using the instanton method, we find that for m< 2H the dominant nucleation channel for the universe is tunneling to a homogeneous, spherical de Sitter space. For larger values of m/H, the most probable tunneling is to an inhomogeneous closed universe with a domain wall wrapped around its equator. We determine the quantum state of the field ϕ in the nucleated universe by solving the Wheeler-DeWitt equation with tunneling boundary conditions. Our results agree with earlier work which assumed a slow-roll regime m≪ H. We finally show that spherical universes nucleating with m< 2H undergo stochastic eternal inflation with inflating regions forming a fractal of dimension d> 2. For larger values of m the field ϕ is unstable with respect to formation of domain walls and cannot be described by a perturbative stochastic approach.
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影响因子:
4.4
作者:
V. Rubakov
通讯作者:
V. Rubakov
DOI:
10.1140/epjc/s10052-020-8412-x
发表时间:
2020
期刊:
The European physical journal. C, Particles and fields
影响因子:
--
作者:
Wang Z;Brandenberger R;Heisenberg L
通讯作者:
Heisenberg L
DOI:
--
发表时间:
1991
期刊:
Physical Review D, Particles and fields
影响因子:
--
作者:
Samuel;Hiscock
通讯作者:
Hiscock
DOI:
10.1002/prop.201800094
发表时间:
2018-10
期刊:
Fortschritte der Physik
影响因子:
--
作者:
G. Dvali;César Gómez;S. Zell
通讯作者:
G. Dvali;César Gómez;S. Zell
影响因子:
4.4
作者:
Andrei Linde
通讯作者:
Andrei Linde