Nonperturbative decay of supersymmetric flat directions

Gümrükçüoğlu, A. Emir; Olive, Keith A.; Peloso, Marco; Sexton, Matthew G.

doi:10.1103/physrevd.78.063512

Cited by 25 publications

(18 citation statements)

References 35 publications

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“…The case of oscillations of a multi-component field is neither captured well by our analysis 13 , see e.g. [90][91][92][93][94]. We speculate nonetheless, that the non-linear dynamics after the initial excitation in all these scenarios, is probably very similar to the one after parametric resonance.…”

Section: Discussionmentioning

confidence: 62%

Parametric resonance in the early Universe—a fitting analysis

Figueroa

Torrentí

2017

J. Cosmol. Astropart. Phys.

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Abstract. Particle production via parametric resonance in the early Universe, is a nonperturbative, non-linear and out-of-equilibrium phenomenon. Although it is a well studied topic, whenever a new scenario exhibits parametric resonance, a full re-analysis is normally required. To avoid this tedious task, many works present often only a simplified linear treatment of the problem. In order to surpass this circumstance in the future, we provide a fitting analysis of parametric resonance through all its relevant stages: initial linear growth, non-linear evolution, and relaxation towards equilibrium. Using lattice simulations in an expanding grid in 3 + 1 dimensions, we parametrize the dynamics' outcome scanning over the relevant ingredients: role of the oscillatory field, particle coupling strength, initial conditions, and background expansion rate. We emphasize the inaccuracy of the linear calculation of the decay time of the oscillatory field, and propose a more appropriate definition of this scale based on the subsequent non-linear dynamics. We provide simple fits to the relevant time scales and particle energy fractions at each stage. Our fits can be applied to post-inflationary preheating scenarios, where the oscillatory field is the inflaton, or to spectator-field scenarios, where the oscillatory field can be e.g. a curvaton, or the Standard Model Higgs.arXiv:1609.05197v2 [astro-ph.CO]

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Section: Discussionmentioning

confidence: 62%

Parametric resonance in the early Universe—a fitting analysis

Figueroa

Torrentí

2017

J. Cosmol. Astropart. Phys.

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“…The case of oscillations of a multi-component field is neither captured by our analysis 12 , see e.g. [80][81][82][83][84][85]. Besides, there are also scenarios where the mechanism responsible for the particle production is not parametric resonance, e.g.…”

Section: Discussionmentioning

confidence: 96%

Gravitational wave production from preheating: parameter dependence

Figueroa

Torrentí

2017

J. Cosmol. Astropart. Phys.

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Parametric resonance is among the most efficient phenomena generating gravitational waves (GWs) in the early Universe. The dynamics of parametric resonance, and hence of the GWs, depend exclusively on the resonance parameter q. The latter is determined by the properties of each scenario: the initial amplitude and potential curvature of the oscillating field, and its coupling to other species. Previous works have only studied the GW production for fixed value(s) of q. We present an analytical derivation of the GW amplitude dependence on q, valid for any scenario, which we confront against numerical results. By running lattice simulations in an expanding grid, we study for a wide range of q values, the production of GWs in post-inflationary preheating scenarios driven by parametric resonance. We present simple fits for the final amplitude and position of the local maxima in the GW spectrum. Our parametrization allows to predict the location and amplitude of the GW background today, for an arbitrary q. The GW signal can be rather large, as h 2 Ω GW (f p ) 10 −11 , but it is always peaked at high frequencies f p 10 7 Hz. We also discuss the case of spectator-field scenarios, where the oscillatory field can be e.g. a curvaton, or the Standard Model Higgs.1 Note that this differs from the case of Higgs-Inflation [24,25], where the post-inflationary decay of the SM Higgs via parametric resonance [26][27][28][29], belongs to the context of preheating, as the Higgs rather plays there the role of the inflaton, instead of a spectator field.2 Note that we do not consider the case of 'oscillons', which correspond to stable field configurations formed whenever a field oscillates around the minimum of its potential, as long as the potential shape meets certain circumstances, see e.g. [54,55]. For the GW production from oscillons see [56,57].3 There exists nonetheless a parameter-fit analysis of the GW production in Hybrid preheating [49], but this corresponds to a spinodal instability of the daughter field modes, not to parametric resonance.

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“…Consider a classical scalar field φ : M B → R in a Bianchi type-I spacetime with Hamilton density H = T (π; g) + V(φ; g). The effective potential V includes the inflaton potential [16]…”

Section: Anisotropic Preludementioning

confidence: 99%

Quantum complete prelude to inflation

Hofmann¹,

Schneider²,

Urban³

2019

Phys. Rev. D

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It is shown that the inflationary paradigm admits quantum complete extensions of space-time. The extended inflationary spacetimes still have geodesic borders, but quantum fields are prohibited from migrating across these borders by their evolution semigroups. The geodesic singularities lurking across the borders lack a physical description because the evolution semigroups give vanishing probabilistic support to quantum fields for populating regions bordering on these singularities. As an example, anisotropic Bianchi type-I cosmologies are shown to be quantum complete preludes to inflation. They admit Kasner-like geometries close to their geodesic borders. Quantum fields enjoy a contractive evolution in these asymptotic regions and ultimately become free. As a consequence, quantum probes cannot migrate across the geodesic border of Bianchi type-I cosmologies.

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Nonperturbative decay of supersymmetric flat directions

Cited by 25 publications

References 35 publications

Parametric resonance in the early Universe—a fitting analysis

Parametric resonance in the early Universe—a fitting analysis

Gravitational wave production from preheating: parameter dependence

Quantum complete prelude to inflation

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