Large scale structure forecast constraints on particle production during inflation

Chantavat, Teeraparb; Gordon, Chris; Silk, Joseph

doi:10.1103/physrevd.83.103501

Cited by 12 publications

(12 citation statements)

References 55 publications

(64 reference statements)

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“…From (125) we find the effective amplitude of the feature to be A 1,eff /A s ∼ = 0.01. This value is well within the observational bounds derived in subsection VI C, however, it should be within reach of future missions [88].…”

Section: B String Monodromy Modelssupporting

confidence: 85%

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Non‐Gaussianity from Particle Production during Inflation

Barnaby

2010

Advances in Astronomy

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In a variety of models the motion of the inflaton may trigger the production of some non-inflaton particles during inflation, for example via parametric resonance or a phase transition. Such models have attracted interest recently for a variety of reasons, including the possibility of slowing the motion of the inflaton on a steep potential. In this review we show that interactions between the produced particles and the inflaton condensate can lead to a qualitatively new mechanism for generating cosmological fluctuations from inflation. We illustrate this effect using a simple prototype model g 2 (φ − φ0) 2 χ 2 for the interaction between the inflaton, φ, and iso-inflaton, χ. Such interactions are quite natural in a variety of inflation models from supersymmetry and string theory. Using both lattice field theory simulations and analytical calculations, we study the quantum production of χ particles and their subsequent rescatterings off the condensate φ(t), which generates bremsstrahlung radiation of light inflaton fluctuations δφ. This mechanism leads to observable features in the primordial power spectrum. We derive observational constraints on such features and discuss their implications for popular models of inflation, including brane/axion monodromy. Inflationary particle production also leads to a very novel kind of nongaussian signature which may be observable in future missions. We argue that this mechanism provides a simple and well-motivated option to generate large nongaussianity, without fine-tuning the inflationary trajectory or appealing to re-summation of an infinite series of high dimension operators.This work is dedicated to the memory of Lev Kofman. PACS numbers: Contents APPENDIX A: Backreaction Effects 44 APPENDIX B: Detailed Computation of P (k) 45 B.1. Time Integrals 46 B.2. Phase Space Integrals 461 By "small" here we refer to any model where the running of the bispectrum is proportional to slow-variation parameters or arises due to loop effects. This does not necessarily mean that such running cannot lead to interesting observational signatures, see [21][22][23][24].

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Section: B String Monodromy Modelssupporting

confidence: 85%

“…In [88] Large Scale Structure forecast constraints were considered for the model (18). It was shown that, for k IR < ∼ 0.1 Mpc −1 , the constraint on A IR /A s will be strengthened to the 0.5% level by Planck or 0.1% including also data from a Square Kilometer Array (SKA).…”

Section: Overview and Summary Of The Mechanismmentioning

confidence: 99%

Non‐Gaussianity from Particle Production during Inflation

Barnaby

2010

Advances in Astronomy

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“…whereT k is defined in (67). This contribution adds up to the one of the transverse modes leading to the result (72) given in the main text.…”

Section: Appendix A: Longitudinal Vector Modementioning

confidence: 91%

“…In [40], a variety of data sets were used to perform a detailed analysis of the observational constraints on localized features with shape (76); we refer the reader to that paper for a discussion of the methodology. See also [67] for forecast constraints from Large Scale Structure data, and see [51] for a discussion of both current and forecasted constraints from measurements of the CMB energy spectrum. In the present work we are mostly interested in a feature localized on CMB scales, in which case the likelihood contours presented in [40] are approximately flat and the observational bound can be roughly summarized as:…”

Section: Phenomenologymentioning

confidence: 99%

Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton

et al. 2012

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We study the possibility that particle production during inflation could source observable gravity waves on scales relevant for Cosmic Microwave Background experiments. A crucial constraint on such scenarios arises because particle production can also source inflaton perturbations, and might ruin the usual predictions for a nearly scale invariant spectrum of nearly Gaussian curvature fluctuations. To minimize this effect, we consider two models of particle production in a sector that is only gravitationally coupled to the inflaton. For a single instantaneous burst of massive particle production, we find that localized features in the scalar spectrum and bispectrum might be observable, but gravitational wave signatures are unlikely to be detectable (due to the suppressed quadrupole moment of non-relativistic quanta) without invoking some additional effects. We also consider a model with a rolling pseudoscalar that leads to a continuous production of relativistic gauge field fluctuations during inflation. Here we find that gravitational waves from particle production can actually exceed the usual inflationary vacuum fluctuations in a regime where non-Gaussianity is consistent with observational limits. In this model observable B-mode polarization can be obtained for any choice of inflaton potential, and the amplitude of the signal is not necessarily correlated with the scale of inflation.

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“…There are many models in the literature that generate different bump-like features, each of which has its own motivation. Here we investigate the following template, which has been extensively studied as a feature generated by particle production mechanisms during inflation [80][81][82][83][84]:…”

Section: Bump Featurementioning

confidence: 99%

The future of primordial features with large-scale structure surveys

Chen

Dvorkin

Huang

et al. 2016

J. Cosmol. Astropart. Phys.

109

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Primordial features are one of the most important extensions of the StandardRecent results from Cosmic Microwave Background (CMB) experiments, in particular the Planck space mission [1,2], have confirmed to high confidence a Standard Model of cosmology in which the Universe is spatially flat, with nearly Gaussian primordial perturbations with a power-law power spectrum which is, close to but not, scale-invariant. These characteristics, together with the observation of super-horizon perturbations via the large-scale temperature-E-mode polarization anti-correlation [3], are all consistent with predictions of the simplest inflationary models [4][5][6], and make possible to distinguish among different inflationary models, and between inflation and alternative-to-inflation models (e.g. [7,8]). In the simplest single-field models of inflation, the inflaton field driving inflation is a canonical scalar field slowly rolling on a smooth potential. While classes of inflationary models and alternative-to-inflation models have been ruled out by available data, future data will make possible to address the next challenges: to seek further evidence for inflation, and to shed light on the physics of inflationary models. There are three complementary routes: primordial non-Gaussianity, which probes the (self)interactions of fields in the primordial Universe; primordial gravity waves, as they leave a signature in the CMB polarization pattern and are directly related to the energy scale of the primordial Universe; and departures from a smooth power spectrum in the form of specific features. In this paper we study the imprints of the latter signals on the large-scale structure of the Universe and make forecasts of their detectability.An important class of beyond-Standard-Model feature signals is the scale-dependent oscillatory signal in the power spectrum of the curvature perturbations. Depending on their natures, these signals provide a variety of valuable information on the physics of the primordial Universe. Broadly speaking, we will study the following several classes of models, their

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Large scale structure forecast constraints on particle production during inflation

Cited by 12 publications

References 55 publications

Non‐Gaussianity from Particle Production during Inflation

Non‐Gaussianity from Particle Production during Inflation

Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton

The future of primordial features with large-scale structure surveys

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