Multi-field cold and warm inflation and the de Sitter swampland conjectures

Bertolami, Orfeu; Sá, Paulo M.

doi:10.1088/1475-7516/2022/09/001

Cited by 14 publications

(10 citation statements)

References 38 publications

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“…These last requirements are consistent with constraints arising from the CMB data [12] (see Ref. [13] for a detailed discussion), ǫ < 0.0044 (6) and η = −0.015 ± 0.006, (7) whose values, clearly, do not match the requirements on c 2 and c 3 .…”

Section: Introductionsupporting

confidence: 83%

“…Actually, it can be shown that the incompatibility remains for whatever number of scalar fields drives inflation provided their kinetic energy terms are canonical [13]. However, it is possible to reconcile the swampland conjectures with observations in the context of warm inflationary models [14,15] in the regime of strong dissipation for one [16,17] or more scalar fields [13].…”

Section: Introductionmentioning

confidence: 95%

“…[50] non-canonical kinetic energy terms have been considered. More recently, it has been shown that multi-field inflation cannot be made compatible with the swampland conjectures without a significant amount of dissipation [13].…”

Section: Inflation In the Nonminimally Coupled Theorymentioning

confidence: 99%

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Theories of gravity with nonminimal matter-curvature coupling and the de Sitter swampland conjectures

Bertolami¹,

Gomes²,

Sá³

2023

Preprint

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We discuss, in the context of alternative theories of gravity with nonminimal coupling between matter and curvature, if inflationary solutions driven by a single scalar field can be reconciled with the swampland conjectures about the emergence of de Sitter solutions in string theory. We find that the slow-roll conditions are incompatible with the swampland conjectures for a fairly generic inflationary solution in such alternative theories of gravity.

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Section: Introductionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 95%

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Theories of gravity with nonminimal matter-curvature coupling and the de Sitter swampland conjectures

Bertolami¹,

Gomes²,

Sá³

2023

Preprint

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“…Moreover, there are several papers in the literature which studied WI using some quasi-de Sitter form of scale factor, e.g., intermediate and logamediate inflation, and other noncanonical versions of field theory, e.g., tachyonic fields, in the high dissipative regime [117][118][119][120][121][122][123][124][125], while there have been also many studies involving different forms of inflaton potentials and in other interesting contexts [79,111,[126][127][128][129][130][131][132][133][134][135][136][137][138][139][140][141][142][143][144].…”

Section: B Other Applications and Recent Results In Wimentioning

confidence: 99%

Recent developments in warm inflation

Kamali¹,

Motaharfar²,

Ramos³

2023

Preprint

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Warm inflation, its different particle physics model implementations and the implications of dissipative particle production for its cosmology are reviewed. First, we briefly present the background dynamics of warm inflation and contrast it with the cold inflation picture. An exposition of the space of parameters for different well-motivated potentials, which are ruled out, or severely constrained in the cold inflation scenario, but not necessarily in warm inflation, is provided. Next, the quantum field theory aspects in realizing explicit microscopic models for warm inflation are given. This includes the derivation of dissipation coefficients relevant in warm inflation for different particle field theory models. The dynamics of cosmological perturbations in warm inflation are then described. The general expression for the curvature scalar power spectrum is shown. We then discuss in details the relevant regimes of warm inflation, the weak and strong dissipative regimes. We also discuss the results predicted in these regimes of warm inflation and how they are confronted with the observational data. We explain how the dissipative dynamics in warm inflation can address several long-standing issues related to (post-) inflationary cosmology. This includes recent discussions concerning the so-called swampland criteria and how warm inflation can belong to the landscape of string theory.

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“…Interestingly, the dissipation features of warm inflation are quite relevant for matching inflation with the so-called swampland conjectures (see, for instance,[17][18][19]). …”

mentioning

confidence: 91%

Seeding the vacuum with entropy: the Chaplygin-like vacuum hypothesis

Bertolami

2023

Class. Quantum Grav.

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It is proposed that the vacuum admits two different phases as described by the Chaplygin equation of state or its generalised version: a phase where the energy density behaves as if dominated by non-relativistic matter and a de Sitter phase. The particle production due to the expansion that takes place at the matter-like phase can generate entanglement entropy and provide, through interactions, the environment that turn gravitational quantum features into classical ones. In the ensued de Sitter phase, the cosmological constant can be suppressed by inflation.

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Multi-field cold and warm inflation and the de Sitter swampland conjectures

Cited by 14 publications

References 38 publications

Theories of gravity with nonminimal matter-curvature coupling and the de Sitter swampland conjectures

Theories of gravity with nonminimal matter-curvature coupling and the de Sitter swampland conjectures

Recent developments in warm inflation

Seeding the vacuum with entropy: the Chaplygin-like vacuum hypothesis

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