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STOLAS: STOchastic LAttice Simulation of cosmic inflation

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arxiv 2405.10692 v2 pith:75TZUN3J submitted 2024-05-17 astro-ph.CO gr-qchep-phhep-th

Yurino Mizuguchi , Tomoaki Murata , Yuichiro Tada This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords inflationstolaslatticesimulationapplicationcosmicpackageperturbation
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We develop a C++ package of the STOchastic LAttice Simulation (STOLAS) of cosmic inflation. It performs the numerical lattice simulation in the application of the stochastic-$\delta N$ formalism. STOLAS can directly compute the three-dimensional map of the observable curvature perturbation without estimating its statistical properties. In its application to two toy models of inflation, chaotic inflation and Starobinsky's linear-potential inflation, we confirm that STOLAS is well-consistent with the standard perturbation theory. Furthermore, by introducing the importance sampling technique, we have success in numerically sampling the current abundance of primordial black holes in a non-perturbative way. The package is available at https://github.com/STOchasticLAtticeSimulation/STOLAS_dist.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Nonlinear Lattice Framework for Inflation: Bridging stochastic inflation and the $\delta{N}$ formalism

    gr-qc 2026-04 unverdicted novelty 8.0 of 10

    A shear-free locally FLRW lattice framework for single-field inflation captures spatially varying expansion, curvature corrections, and nonlinear δN observables at a fraction of the cost of full numerical relativity.

  2. Harvesting primordial black holes from stochastic trees with $\texttt{FOREST}$

    astro-ph.CO 2025-01 conditional novelty 7.0 of 10

    A stochastic-branching-tree implementation of inflation, FOREST, computes curvature maps and primordial black hole mass functions with cloud-in-cloud effects included.

  3. STOchastic LAttice Simulation of hybrid inflation

    astro-ph.CO 2026-03 conditional novelty 6.0 of 10

    In hybrid inflation, stochastic noise breaks topological defects into sub-Hubble-scale structures, and only the n=1 case leaves a global imprint on the curvature perturbation.

  4. Friction in Stochastic Inflation

    astro-ph.CO 2025-11 accept novelty 6.0 of 10

    Adding a constant drift to time-reversed stochastic inflation in a flat potential yields an exact curvature distribution with exponential tails; forward and reverse delta-N formalisms differ by a factor of two in the ...

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