Irruption of massive particle species during inflation

Fedderke, Michael A.; Kolb, Edward W.; Wyman, Mark

doi:10.1103/physrevd.91.063505

Cited by 40 publications

(43 citation statements)

References 44 publications

(156 reference statements)

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“…We note xxxix In general this is not a consistent assumption to make if the background trajectory is turning in field space [97], however given (83), it can be shown that this is a consistent assumption to make even at the level of the effective action [80]. that in our derivation, the ψ quanta do not need to become exactly massless xl at φ * , as has typically been considered in the literature, only that the scale µ be such that the adiabatic condition (82) be violated, which can happen for reasonable values consistent with slow roll and the existence of the appropriate hierarchies between the mass of the heavy quanta and H. Of course, particle production is parametrically enhanced when the ψ quanta become exactly massless, as considered in [143][144][145][146][147][148], whose results can be viewed as a particular case of the treatment elaborated upon here.…”

Section: Light Particle Content and Particle Productionmentioning

confidence: 96%

Features and new physical scales in primordial observables: Theory and observation

Chluba

Hamann

Patil

2015

Int. J. Mod. Phys. D

208

233

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June 22, 20152 All cosmological observations to date are consistent with adiabatic, Gaussian and nearly scale invariant initial conditions. These findings provide strong evidence for a particular symmetry breaking pattern in the very early universe (with a close to vanishing order parameter, ), widely accepted as conforming to the predictions of the simplest realizations of the inflationary paradigm. However, given that our observations are only privy to perturbations, in inferring something about the background that gave rise to them, it should be clear that many different underlying constructions project onto the same set of cosmological observables. Features in the primordial correlation functions, if present, would offer a unique and discriminating window onto the parent theory in which the mechanism that generated the initial conditions is embedded. In certain contexts, simple linear response theory allows us to infer new characteristic scales from the presence of features that can break the aforementioned degeneracies among different background models, and in some cases can even offer a limited spectroscopy of the heavier degrees of freedom that couple to the inflaton. In this review, we offer a pedagogical survey of the diverse, theoretically well grounded mechanisms which can imprint features into primordial correlation functions in addition to reviewing the techniques one can employ to probe observations. These observations include cosmic microwave background anisotropies and spectral distortions as well as the matter two and three point functions as inferred from large-scale structure and potentially, 21 cm surveys.

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Section: Light Particle Content and Particle Productionmentioning

confidence: 96%

Features and new physical scales in primordial observables: Theory and observation

Chluba

Hamann

Patil

2015

Int. J. Mod. Phys. D

208

233

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“…The Superheavy Dark Matter (SHDM) φ, based on the possibility of particle production due to time varying gravitational fields, is an alternative DM scenario [19][20][21][22][23][24][25][26][27][28][29]. This scenario is based on three hypotheses: (a) SHDM in the early Universe never reaches LTE; (b) SHDM has a mass with the same order of magnitude as the inflaton mass; (c) the lifetime of SHDM exceeds the age of the Universe, that is τ φ ≫ t 0 [17,18].…”

Section: Introductionmentioning

confidence: 99%

Hints on the existence of superheavy dark matter and ultrahigh energy dark matter in extreme energy cosmic rays observations

2019

Physics of the Dark Universe

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In the present paper, it is assumed that there exist two dark matter particles: superheavy dark matter particles (SHDM), whose mass ∼ inflaton mass, and lighter fermion dark matter particles (LFDM) which are the ultra-relativistic products of its decay. The event rates of LFDM measured by the Pierre Auger observatory (Auger) are evaluated in the energy range between 1 EeV and 1 ZeV at the zenith angles between 0 • and 60 • when the different lifetimes of decay of SHDM. Thus it is proved that the possibility of measurement of these LFDM at Auger. Based on the assumption that the detection efficiency for a shower caused by LFDM is set to be 100%, the LFDM contribution to the energy spectrum of extreme energy cosmic rays (EECRs) is discussed. And it is found that there are some hints on the existence of SHDM and LFDM in the past EECRs observations.

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“…Indeed, the idea was originally introduced 7 as a means for reheating after inflation. Since 5 subsequent work [8][9][10][11] has elaborated on the basic scheme into a model with coupling between two scalar fields.…”

Section: Resonant Particle Production During Inflationmentioning

confidence: 99%

Evidence for Planck-scale resonant particle production during inflation from the CMB power spectrum

Mathews¹,

Gangopadhyay²,

Ichiki³

et al. 2017

The Fourteenth Marcel Grossmann Meeting

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The power spectrum of the cosmic microwave background from both the Planck and WMAP data exhibits a slight dip for multipoles in the range of l = 10−30. We show that such a dip could be the result of the resonant creation of massive particles that couple to the inflaton field. For our best-fit models, the epoch of resonant particle creation reenters the horizon at a wave number of k * ∼ 0.0011 ± 0.0004 (h Mpc −1 ). The amplitude and location of this feature corresponds to the creation of a number of degenerate fermion species of mass ∼ (8 − 11)/λ 3/2 m pl during inflation where λ ∼ (1.0 ± 0.5)N −2/5 is the coupling constant between the inflaton field and the created fermion species, while N is the number of degenerate species. Although the evidence is of marginal statistical significance, this could constitute new observational hints of unexplored physics beyond the Planck scale.

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Irruption of massive particle species during inflation

Cited by 40 publications

References 44 publications

Features and new physical scales in primordial observables: Theory and observation

Features and new physical scales in primordial observables: Theory and observation

Hints on the existence of superheavy dark matter and ultrahigh energy dark matter in extreme energy cosmic rays observations

Evidence for Planck-scale resonant particle production during inflation from the CMB power spectrum

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