Quantum interference in gravitational particle production

Basso, Edward; Chung, Daniel J. H.; Kolb, Edward W.; Long, Andrew J.

doi:10.1007/jhep12(2022)108

Cited by 10 publications

(10 citation statements)

References 67 publications

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“…For masses m m φ , the leading channel is kinematically blocked, and the next open channel, φφφ → χχ, dominates for 2m < 3m φ , Minimally-coupled theory, scalar Π leading to a steeper power-law envelope, n k ∝ k −9/2 . The oscillatory features superimposed on the power law are due to interference between different scattering channels from φ to χ [64].…”

Section: Minimal Matter Couplingmentioning

confidence: 97%

“…After inflation, the inflaton oscillates about the minimum of its potential with an angular frequency m φ , which imprints oscillatory features onto the spectrum of the gravitationally produced particles with ∆k = O(m φ ). In this regime, where particle production is governed by coherent inflaton field oscillations on a quadratic potential, gravitational particle production can be described as scattering and annihilation of inflaton particles [60][61][62][63][64]. For Minimally-coupled theory, tensor Minimally-coupled theory, vector Minimally-coupled theory, scalar B…”

Section: Minimal Matter Couplingmentioning

confidence: 99%

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Cosmological gravitational particle production of massive spin-2 particles

Kolb¹,

Ling²,

Long³

et al. 2023

Preprint

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The phenomenon of cosmological gravitational particle production (CGPP) is expected to occur during the period of inflation and the transition into a hot big bang cosmology. Particles may be produced even if they only couple directly to gravity, and so CGPP provides a natural explanation for the origin of dark matter. In this work we study the gravitational production of massive spin-2 particles assuming two different couplings to matter. We evaluate the full system of mode equations, including the helicity-0 modes, and by solving them numerically we calculate the spectrum and abundance of massive spin-2 particles that results from inflation on a hilltop potential. We conclude that CGPP might provide a viable mechanism for the generation of massive spin-2 particle dark matter during inflation, and we identify the favorable region of parameter space in terms of the spin-2 particle's mass and the reheating temperature. As a secondary product of our work, we identify the conditions under which such theories admit ghost or gradient instabilities, and we thereby derive a generalization of the Higuchi bound to Friedmann-Robertson-Walker (FRW) spacetimes.

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Section: Minimal Matter Couplingmentioning

confidence: 97%

Section: Minimal Matter Couplingmentioning

confidence: 99%

Cosmological gravitational particle production of massive spin-2 particles

Kolb¹,

Ling²,

Long³

et al. 2023

Preprint

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show abstract

“…[69][70][71][72][73][74] and more recently in e.g., refs. [75][76][77]. While GPP is an effect of tiny magnitude, it is possible for the energy density of particles produced gravitationally to be large at late times in comparison to other fields.…”

Section: Gravitational Particle Productionmentioning

confidence: 99%

Completely dark matter from rapid-turn multifield inflation

Kolb

Long

McDonough

et al. 2023

J. High Energ. Phys.

Self Cite

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We study cosmological gravitational particle production as applied to “rapid-turn” models of inflation involving two scalar fields. We are interested in the production of massive spin-0 particles that only interact gravitationally and provide a candidate for the dark matter. Specifically, we study two models of rapid-turn multifield inflation, motivated in part by the de Sitter swampland conjecture, that are distinguished by the curvature of field space and the presence or absence of field space ‘angular momentum’ conservation. We find that one of these models leads to insufficient particle production and cannot explain the observed dark matter relic abundance. The second model is able to explain the origin of spin-0 dark matter via gravitational production, and we identify the relevant region of parameter space that is consistent with measurements of the dark-matter relic abundance, the dark-matter-photon isocurvature perturbations, and the spectrum of curvature perturbations that is probed by cosmological observations. Our work demonstrates the compatibility of the de Sitter swampland conjecture with completely dark matter.

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“…One unavoidable contribution to the dark sector abundance is the production through tree level graviton exchange, also known as gravitational freeze-in [1,2]. This is efficient if the reheating temperature is close to the experimental bound from inflation T R | max ≈ 5 × 10 15 GeV and rapidly declines for smaller values. Another generic mechanism is particle production due the time dependent background [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…We do not consider here the model dependent contribution to particle production from inflaton scatterings[10][11][12][13][14][15][16].…”

mentioning

confidence: 99%

Jump starting the dark sector with a phase transition

Redi

Tesi

2023

J. High Energ. Phys.

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We study the possibility to populate the dark sector through a phase transition. We will consider secluded dark sectors made of gauge theories, Randall-Sundrum scenarios and conformally coupled elementary particles. These sectors have in common the fact that the action is approximately Weyl invariant, implying that particle production due to time dependent background is strongly suppressed. In particular no significant production takes place during inflation allowing to avoid strong isocurvature constraints from CMB. As we will show, if the scale of inflation is large compared to the dynamical mass scale, these sectors automatically undergo a phase transition that in the simplest cases is controlled by the Hubble parameter. If the phase transition takes place during reheating or radiation the abundance obtained can be larger than particle production and production from the SM plasma. For phase transitions completing during radiation domination, the DM mass is predicted in the range 108 GeV while larger values are required for phase transitions occurring during reheating.

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Quantum interference in gravitational particle production

Cited by 10 publications

References 67 publications

Cosmological gravitational particle production of massive spin-2 particles

Cosmological gravitational particle production of massive spin-2 particles

Completely dark matter from rapid-turn multifield inflation

Jump starting the dark sector with a phase transition

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