Numerical stochastic inflation constrained by frozen noise

被引:14
作者
Tomberg, Eemeli [1 ]
机构
[1] NICPB, Lab High Energy & Computat Phys, Ravala Pst 10, EE-10143 Tallinn, Estonia
关键词
cosmological perturbation theory; inflation; quantum field theory on curved space; primordial black holes; QUANTUM-FIELDS; DYNAMICS; PERTURBATIONS; UNIVERSE; HORIZON; SPACE;
D O I
10.1088/1475-7516/2023/04/042
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Stochastic inflation can resolve strong inflationary perturbations, which seed primordial black holes. I present a fast , accurate way to compute these perturbations in typical black hole producing single-field models, treating the short-wavelength Fourier modes beyond the de Sitter approximation. The squeezing and freezing of the modes reduces the problem to one dimension , the resulting new form of the stochastic equations, dubbed `constrained stochastic inflation,' can be solved efficiently with semi-analytical techniques and numerical importance sampling. In an example case, the perturbation distribution is resolved in seconds deep into its non-Gaussian tail, a speed-up of factor 109 compared to a previous study. Along the way, I comment on the role of the momentum constraint in stochastic inflation.
引用
收藏
页数:34
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