The tunneling wavefunction in Kantowski-Sachs quantum cosmology
The tunneling wavefunction in Kantowski-Sachs quantum cosmology
复制标题
康托夫斯基-萨克斯量子宇宙学中的隧道波函数
DOI:
10.1088/1475-7516/2022/08/069
复制
发表时间:
2022
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
We use a path-integral approach to study the tunneling wave function in quantum cosmology with spatial topology S 1× S 2 and positive cosmological constant (the Kantowski-Sachs model). If the initial scale factors of both S 1 and S 2 are set equal to zero, the wave function describes (semiclassically) a universe originating at a singularity. This may be interpreted as indicating that an S 1× S 2 universe cannot nucleate out of nothing in a non-singular way. Here we explore an alternative suggestion by Halliwell and Louko that creation from nothing corresponds in this model to setting the initial volume to zero. We find that the only acceptable version of this proposal is to fix the radius of S 1 to zero, supplementing this with the condition of smooth closure (absence of a conical singularity). The resulting wave function predicts an inflating universe of high anisotropy, which however becomes locally isotropic at late times. Unlike the de Sitter model, the total nucleation probability is not exponentially suppressed, unless a Gauss-Bonnet term is added to the action.
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影响因子:
4.4
作者:
V. Rubakov
通讯作者:
V. Rubakov
DOI:
10.1103/physrevd.39.2206
发表时间:
1989
期刊:
Physical review. D, Particles and fields
影响因子:
--
作者:
J. Halliwell;J. Louko
通讯作者:
J. Louko
影响因子:
4.4
作者:
J. Louko;T. Vachaspati
通讯作者:
T. Vachaspati
影响因子:
6.4
作者:
A. Barvinsky;A. Kamenshchik
通讯作者:
A. Kamenshchik
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
Y. Zel’dovich;A. A. Starobinskii
通讯作者:
A. A. Starobinskii