Preheating with non-standard kinetic term

Lachapelle, Jean; Brandenberger, Robert H.

doi:10.1088/1475-7516/2009/04/020

Cited by 40 publications

(42 citation statements)

References 27 publications

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“…The stability/instability chart for the general Hill's equation is still poorly understood, compared to the one for the Mathieu equation, which is the simplest case of the Hill's equation (for existing studies of the Hill's equation, see Refs. [27][28][29][30][31][32][33][34][35]). As a consequence of the anharmonic oscillation of the background axion, the resonance instability which leads to the prominent emission of the GWs can be qualitatively different from the one described by the Mathieu equation.…”

Section: Introductionmentioning

confidence: 99%

Efficient self-resonance instability from axions

Fukunaga

Kitajima

Urakawa

2019

J. Cosmol. Astropart. Phys.

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It was recently shown that a coherent oscillation of an axion can cause an efficient parametric resonance, leading to a prominent emission of the gravitational waves (GWs). In this paper, conducting the Floquet analysis, we investigate the parametric resonance instability, which potentially triggers the emission of the GWs from axions. Such a resonance instability takes place, when the time evolution of the background field significantly deviates from the harmonic oscillation. Therefore, the resonance instability cannot be described by the Mathieu equation, whose stability/instability chart is well known. In this paper, introducing an explicitly calculable parameterq, which can be used to classify different types of the parametric resonance described by the general Hill's equation, we investigate the stability/instability chart for the general Hill's equation. This can also apply to the case where the background oscillation is anharmonic. We show that the flapping resonance instability, which takes place forq = O(1), typically leads to the most significant growth of the inhomogeneous modes among the self-resonance instability. We also investigate whether the flapping resonance takes place for the cosine potential or not.

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Section: Introductionmentioning

confidence: 99%

Efficient self-resonance instability from axions

Fukunaga

Kitajima

Urakawa

2019

J. Cosmol. Astropart. Phys.

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“…The search for preheating in nonminimal models began in the work of Ref. [25], where the authors showed that a canonical scalar field can enhance the effects of parametric resonance in a coupled nonminimal matter field. …”

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confidence: 99%

Preheating with Nonminimal Kinetic Terms

et al. 2013

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We present the first (3 + 1)-dimensional numerical simulations of scalar fields with nonminimal kinetic terms. As an example, we examine the existence and stability of preheating in the presence of a Dirac-Born-Infeld inflaton coupled to a canonical matter field. The simulations represent the full nonlinear theory in the presence of an expanding universe. We show that parametric resonance in the matter field along with self-resonance in the inflaton repopulate the universe with matter particles as efficiently as in traditional preheating.Scalar fields need not be Klein-Gordon-like in four dimensions; theories that include extra dimensions, whether large or small, have effective four-dimensional kinetic terms that are nonminimal. This has led to an increased interest in the dynamics of nonminimal models both to describe inflation, e.g. Dirac-Born-Infeld (DBI) inflation [1], and even more recently, dark energy [2][3][4]. In this Letter, we will focus on DBI inflation, as an example of a system for which we have a scalar degree of freedom whose behavior is self-consistent and stable and whose nonminimal behavior is central to the dynamics of the model. Here, we focus on what happens at the end of inflation when the scalar inflaton becomes inhomogeneous and its couplings to other fields are important. To our knowledge, these are the first three-dimensional lattice simulations of this type of field theory.Preheating [5][6][7][8][9][10][11][12][13][14][15][16][17] provides a mechanism by which the cold postinflationary universe can quickly and efficiently transfer energy into a matter sector, via a period of parametric resonance or a regime of tachyonic instability. For the most part, studies of preheating have focused on the existence and stability of these processes in the presence of different inflationary potentials, e.g., Refs. [17][18][19][20][21][22], multiple fields [23], and multiple decay channels [24]. DBI inflation might end with a coherently oscillating scalar field, and it has been unclear whether preheating can persist in the presence of nonlinear terms in its equation of motion. The search for preheating in nonminimal models began in the work of Ref. [25], where the authors showed that a canonical scalar field can enhance the effects of parametric resonance in a coupled nonminimal matter field.

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“…5 Derivative interactions give rise to similar particle production effects, see for instance Ref. [50].…”

Section: Heating Via Matter Interactionsmentioning

confidence: 97%

Emergent scale symmetry: Connecting inflation and dark energy

2017

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Quantum gravity computations suggest the existence of an ultraviolet and an infrared fixed point where quantum scale invariance emerges as an exact symmetry. We discuss a particular variable gravity model for the crossover between these fixed points which can naturally account for inflation and dark energy, using a single scalar field. In the Einstein-frame formulation the potential can be expressed in terms of Lambert functions, interpolating between a power-law inflationary potential and a mixed-quintessence potential. For two natural heating scenarios, the transition between inflation and radiation domination proceeds through a "graceful reheating" stage. The radiation temperature significantly exceeds the temperature of big bang nucleosynthesis. For this type of model, the observable consequences of the heating process can be summarized in a single parameter, the heating efficiency. Our quantitative analysis of compatibility with cosmological observations reveals the existence of realistic models able to describe the whole history of the Universe using only a single metric and scalar field and involving just a small number of order one parameters.Comment: 22 pages, 13 figures, matches the version published in PRD, added clarifications and references, corrected typo

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Preheating with non-standard kinetic term

Cited by 40 publications

References 27 publications

Efficient self-resonance instability from axions

Efficient self-resonance instability from axions

Preheating with Nonminimal Kinetic Terms

Emergent scale symmetry: Connecting inflation and dark energy

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