<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi mathvariant="script">C</mml:mi></mml:math>osmo<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml:mi mathvariant="script">L</mml:mi></mml:math>attice: A modern code for lattice simulations of scalar and gauge field dynamics in an expanding universe

Figueroa, Daniel G.; Florio, Adrien; Torrentí, Francisco; Valkenburg, Wessel

doi:10.1016/j.cpc.2022.108586

Cited by 48 publications

(31 citation statements)

References 17 publications

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“…Using CosmoLattice [64,65], we performed lattice simulations to obtain β for different values of k in eq. (2.1).…”

Section: Lattice Simulationsmentioning

confidence: 99%

Effects of fragmentation on post-inflationary reheating

Garcia,

Gross,

Mambrini

et al. 2023

J. Cosmol. Astropart. Phys.

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We consider the effects of fragmentation on the post-inflationary epoch of reheating. In simple single field models of inflation, an inflaton condensate undergoes an oscillatory phase once inflationary expansion ends. The equation of state of the condensate depends on the shape of the scalar potential, V(ϕ), about its minimum. Assuming V(ϕ) ∼ ϕk , the equation of state parameter is given by w = Pϕ /ρϕ = (k - 2)/(k + 2). The evolution of condensate and the reheating process depend on k. For k ≥ 4, inflaton self-interactions may lead to the fragmentation of the condensate and alter the reheating process. Indeed, these self-interactions lead to the production of a massless gas of inflaton particles as w relaxes to 1/3. If reheating occurs before fragmentation, the effects of fragmentation are harmless. We find, however, that the effects of fragmentation depend sensitively to the specific reheating process. Reheating through the decays to fermions is largely excluded since perturbative couplings would imply that fragmentation occurs before reheating and in fact could prevent reheating from completion. Reheating through the decays to boson is relatively unaffected by fragmentation and reheating through scatterings results in a lower reheating temperature.

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“…Using CosmoLattice [64,65], we performed lattice simulations to obtain β for different values of k in eq. (2.1).…”

Section: Lattice Simulationsmentioning

confidence: 99%

Effects of fragmentation on post-inflationary reheating

Garcia,

Gross,

Mambrini

et al. 2023

J. Cosmol. Astropart. Phys.

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“…While this discussion is focused on the inflationary evolution, lattice simulations of reheating at the end of inflation can be found in Refs [47][48][49][50][51][52][53][54]4.…”

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confidence: 99%

Axion inflation in the strong-backreaction regime: decay of the Anber-Sorbo solution

von Eckardstein,

Peloso,

Schmitz

et al. 2023

J. High Energ. Phys.

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Axion inflation coupled to Abelian gauge fields via a Chern-Simons-like term of the form $$ \phi F\overset{\sim }{F} $$ ϕF F ~ represents an attractive inflationary model with a rich phenomenology, including the production of magnetic fields, black holes, gravitational waves, and the matter-antimatter asymmetry. In this work, we focus on a particular regime of axion inflation, the so-called Anber-Sorbo (AS) solution, in which the energy loss in the gauge-field production provides the dominant source of friction for the inflaton motion. We revisit the AS solution and confirm that it is unstable. Contrary to earlier numerical works that attempted to reach the AS solution starting from a regime of weak backreaction, we perform, for the first time, a numerical evolution starting directly from the regime of strong backreaction. Our analysis strongly suggests that, at least as long as one neglects spatial inhomogeneities in the inflaton field, the AS solution has no basin of attraction, not even a very small one that might have been missed in previous numerical studies. Our analysis employs an arsenal of analytical and numerical techniques, some established and some newly introduced, including (1) linear perturbation theory along the lines of ref. [1], (2) the gradient expansion formalism (GEF) developed in ref. [2], (3) a new linearized version of the GEF, and (4) the standard mode-by-mode approach in momentum space in combination with input from the GEF. All these methods yield consistent results confirming the instability of the AS solution, which renders the dynamics of axion inflation in the strong-backreaction regime even more interesting than previously believed.

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“…In order to properly assess the formation of oscillons, we will resort in what follows to non-perturbative 3 + 1 classical lattice simulations. We will make use of the recently developed CosmoLattice package [98,99]. This public code allows to solve the preheating dynamics in a self-consistent way, accounting not only for particle production but also for its backreaction effects on the homogeneous Friedmann equations (3.2) and therefore on the scale factor evolution.…”

Section: Jcap12(2023)002 3 Preheating In the Scalar Sectormentioning

confidence: 99%

Preheating in Einstein-Cartan Higgs Inflation: oscillon formation

Piani,

Rubio

2023

J. Cosmol. Astropart. Phys.

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We make use of classical lattice simulations in 3+1 dimensions to study the preheating stage of Higgs Inflation in Einstein-Cartan gravity. Focusing for concreteness on a simplified scenario involving the seminal Nieh-Yan term, we demonstrate the formation of dense and spatially localized oscillon configurations constituting up to 70% of the total energy density. The emergence of these meta-stable objects may lead to a prolonged period of matter domination, effectively modifying the post-inflationary history of the Universe as compared to the metric and Palatini counterparts. Notably, the creation of oscillons comes together with a significant gravitational wave signal, whose typical frequency lies, however, beyond the range accessible by existing and planned gravitational wave experiments. The impact of the Standard Model gauge bosons and fermions and the potential extension of our results to more general Einstein-Cartan settings is also discussed.

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CosmoLattice: A modern code for lattice simulations of scalar and gauge field dynamics in an expanding universe

Cited by 48 publications

References 17 publications

Effects of fragmentation on post-inflationary reheating

Effects of fragmentation on post-inflationary reheating

Axion inflation in the strong-backreaction regime: decay of the Anber-Sorbo solution

Preheating in Einstein-Cartan Higgs Inflation: oscillon formation

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