Preheating after multifield inflation with nonminimal couplings. II. Resonance structure

DeCross, Matthew; Kaiser, David; Prabhu, Anirudh; Prescod-Weinstein, Chanda; Sfakianakis, Evangelos I.

doi:10.1103/physrevd.97.023527

Cited by 64 publications

(106 citation statements)

References 173 publications

(292 reference statements)

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“…We have confirmed that the early growth of δφ and δχ fluctuations in our lattice simulations closely matches the behavior calculated via Floquet analysis in Ref. [18]. Beginning around 2.6 e-folds, nonlinear rescattering among the δχ fluctuations drives rapid growth of the δφ fluctuations for ξ φ = 10.…”

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confidence: 89%

Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings

et al. 2019

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We study the post-inflation dynamics of multifield models involving nonminimal couplings using lattice simulations to capture significant nonlinear effects like backreaction and rescattering. We measure the effective equation of state and typical time-scales for the onset of thermalization, which could affect the usual mapping between predictions for primordial perturbation spectra and measurements of anisotropies in the cosmic microwave background radiation. For large values of the nonminimal coupling constants, we find efficient particle production that gives rise to nearly instantaneous preheating. Moreover, the strong single-field attractor behavior that was previously identified persists until the end of preheating, thereby suppressing typical signatures of multifield models. We therefore find that predictions for primordial observables in this class of models retain a close match to the latest observations. * nguyenr@kenyon.edu † jorindev@nikhef.nl ‡ evans@nikhef.nl §

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confidence: 89%

Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings

et al. 2019

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“…However, as discussed later in Ref. [58][59][60] and independently in Ref. [61], multi-field models of inflation with nonminimal couplings to gravity can exhibit more efficient preheating behavior than previously thought, due to the contribution of the field-space structure to the effective mass of the fluctuations.…”

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confidence: 88%

Preheating after Higgs inflation: Self-resonance and gauge boson production

2019

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We perform an extensive analysis of linear fluctuations during preheating in Higgs inflation in the Einstein frame, where the fields are minimally coupled to gravity, but the field-space metric is nontrivial. The self-resonance of the Higgs and the Higgsed gauge bosons are governed by effective masses that scale differently with the nonminimal couplings and evolve differently in time. Coupled metric perturbations enhance Higgs self-resonance and make it possible for Higgs inflation to preheat solely through this channel. For ξ 100 the total energy of the Higgs-inflaton condensate can be transferred to Higgs particles within 3 efolds after the end of inflation. For smaller values of the nonminimal coupling preheating takes longer, completely shutting off at around ξ 30. The production of gauge bosons is dominated by the gauge boson mass and the field space curvature. For large values of the nonminimal coupling ξ 1000, it is possible for the Higgs condensate to transfer the entirety of its energy into gauge fields within one oscillation. For smaller values of the nonminimal coupling gauge bosons decay very quickly into fermions, thereby shutting off Bose enhancement. Estimates of non-Abelian interactions indicate that they will not suppress preheating into gauge bosons for ξ 1000.1 For inflation on the flat plateau one should consider ξ 440 (e.g. [20]). In models of hilltop or inflection point inflation, smaller values of ξ are possible, although UV corrections are expected to be larger. In order to provide a treatment of Higgs inflation as complete as possible without referring to specific unknown physics, we choose to consider a broad range of non-minimal couplings that go below ξ ≈ 400. 2 See [25] for a way to alter the predictions of α-attractor models through multi-field effects.

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“…Models in this class exhibit interesting phenomenology during and after inflation, e.g. [45][46][47][48]. 9 Considering an inflationary scenario that proceeds towards a final Minkowski minimum, one should distinguish two types of potentials.…”

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confidence: 99%

Scaling attractors in multi-field inflation

Christodoulidis

Roest

Sfakianakis

2019

J. Cosmol. Astropart. Phys.

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Multi-field inflation with a curved scalar geometry has been found to support background trajectories that violate the slow-roll, slow-turn conditions and thus have the potential to evade the swampland constraints. In order to understand how generic this novel behaviour is and what conditions lead to it, we perform a classification of dynamical attractors of two-field inflation that are of the scaling type. Scaling solutions form a oneparameter generalization of De Sitter solutions with a constant value of the first Hubble flow parameter and, as we argue and demonstrate, form a natural starting point for the study of non-slow-roll slow-turn behaviour.All scaling solutions can be classified as critical points of a specific dynamical system. We recover known multi-field inflationary attractors as approximate scaling solutions and classify their stability using dynamical system techniques. In particular, we discover that dynamical bifurcations play an integral role in the transition between geodesic and nongeodesic motion and discuss the ability of scaling solutions to describe realistic multi-field models. We revisit the criteria for background stability and show cases where the usual criteria found in the literature do not capture the background evolution of the system. arXiv:1903.06116v2 [hep-th] 29 Jul 2019 Contents 7 Summary and Discussion 32 A Coordinate transformations and isometries 34 B Hurwitz-Routh stability criterion 34 C Bifurcations in dynamical systems 35 1 There has been a growing interesting for inflationary models involving gauge fields (see e.g. Refs. [13-17]); however, in such cases, a scalar degree of freedom that takes the role of the inflaton can be identified. 2 There are a few examples in the literature which admit general analytical solutions [18-28]. These are completely integrable systems where the mini-super Lagrangian has Noether symmetries, and have been classified in Refs. [29-31].

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Preheating after multifield inflation with nonminimal couplings. II. Resonance structure

Cited by 64 publications

References 173 publications

Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings

Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings

Preheating after Higgs inflation: Self-resonance and gauge boson production

Scaling attractors in multi-field inflation

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