Dissipative inflation via scalar production

Creminelli, Paolo; Kumar, Soubhik; Salehian, Borna; Santoni, Luca

doi:10.1088/1475-7516/2023/08/076

J. Cosmol. Astropart. Phys.

2023

DOI: 10.1088/1475-7516/2023/08/076

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Dissipative inflation via scalar production

Paolo Creminelli,

Soubhik Kumar,

Borna Salehian

et al.

Abstract: We describe a new mechanism that gives rise to dissipation during cosmic inflation. In the simplest implementation, the mechanism requires the presence of a massive scalar field with a softly-broken global U(1) symmetry, along with the inflaton field. Particle production in this scenario takes place on parametrically sub-horizon scales, at variance with the case of dissipation into gauge fields. Consequently, the backreaction of the produced particles on the inflationary dynamics can be treated in a local mann… Show more

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Cited by 2 publications

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“…4. To avoid this problem, and generate a stable steady-state dissipative regime, Ref [56]. recently provided a construction, based on scalar field interactions, that can generate an "instantaneous" sensitivity of the backreaction to the particle production.…”

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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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mentioning

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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In-in formalism for the entropy of quantum fields in curved spacetimes

Colas,

Grain,

Kaplanek

et al. 2024

J. Cosmol. Astropart. Phys.

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We show how to compute the purity and entanglement entropy for quantum fields in a systematic perturbative expansion. To that end, we generalize the in-in formalism to non-unitary dynamics (i.e. accounting for the presence of an environment) and to the calculation of quantum information measures, which are not observables in the usual sense. This allows us to reduce the problem to one involving standard correlation functions, and to organize their computation in a diagrammatic expansion for which we construct the corresponding Feynman rules. As an illustration, we apply the formalism to a cosmological setting inspired by the effective field theory of inflation. We find that at late times, non-linear loop corrections share the same time behavior as the linear contribution, and only yield a slight redressing of the purity. In particular, when the environment is heavy compared to the Hubble scale, the phenomenon of recoherence previously encountered is robust to the class of non-linear extensions considered. Bridging the gap between perturbative quantum field theory and open quantum systems paves the way to a better understanding of renormalization and resummation in open effective field theories. It also enables a more systematic exploration of quantum information properties in field theoretic settings.

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Dissipative inflation via scalar production

Cited by 2 publications

References 46 publications

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

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

In-in formalism for the entropy of quantum fields in curved spacetimes

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