Stochastic formalism for U(1) gauge fields in axion inflation
Stochastic formalism for U(1) gauge fields in axion inflation
复制标题
轴子膨胀中 U(1) 规范场的随机形式
DOI:
10.1088/1475-7516/2022/12/026
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发表时间:
2022
影响因子:
6.4
通讯作者:
Tada Yuichiro
中科院分区:
文献类型:
--
作者:
Fujita Tomohiro;Mukaida Kyohei;Tada Yuichiro
We develop the stochastic formalism for U (1) gauge fields that has the Chern-Simons coupling to a rolling pseudo-scalar field during inflation. The Langevin equations for the physical electromagnetic fields are derived and the analytic solutions are studied. Using numerical simulation we demonstrate that the electromagnetic fields averaged over the Hubble scale continuously change their direction and their amplitudes fluctuate around the analytically obtained expectation values. Though the isotropy is spontaneously broken by picking up a particular local Hubble patch, each Hubble patch is understood independent and the isotropy is conserved globally by averaging all the Hubble patches.
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DOI:
--
发表时间:
2016
期刊:
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