Particle production during inflation in light of Planck data

Battefeld, Diana; Battefeld, Thorsten; Fiene, Daniel; Platz, Friedrich Hund

doi:10.1103/physrevd.89.123523

Cited by 12 publications

(14 citation statements)

References 213 publications

(300 reference statements)

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“…An inflaton potential with a step was studied in the Einstein frame [45] (see also [46]) and shown to result in oscillations in the power spectra. Fading oscillatory features in the primordial scalar power spectrum can also occur from jumps in the potential [47][48][49][50][51], particle production during inflation [52][53][54] or turns in the inflaton trajectory in the landscape of heavy fields [55][56][57][58][59]. For a discussion of observed features in the primordial power spectrum, see for instance [60] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Effect of transitions in the Planck mass during inflation on primordial power spectra

et al. 2014

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We study the effect of sudden transitions in the effective Planck mass during inflation on primordial power spectra. Specifically, we consider models in which this variation results from the non-minimal coupling of a Brans-Dicke type scalar field. We find that the scalar power spectra develop features at the scales corresponding to those leaving the horizon during the transition. In addition, we observe that the tensor perturbations are largely unaffected, so long as the variation of the Planck mass is below the percent level. Otherwise, the tensor power spectra exhibit damped oscillations over the same scales. Due to significant features in the scalar power spectra, the tensor-to-scalar ratio r shows variation over the corresponding scales. Thus, by studying the spectra of both scalar and tensor perturbations, one can constrain sudden but small variations of the Planck mass during inflation. We illustrate these effects with a number of benchmark singleand two-field models. In addition, we comment on their implications and the possibility to alleviate the tension between the observations of the tensor-to-scalar ratio performed by the Planck and BICEP2 experiments.

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Section: Introductionmentioning

confidence: 99%

Effect of transitions in the Planck mass during inflation on primordial power spectra

et al. 2014

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“…An interesting generalization has also been considered in [149][150][151][152] xli , where motivated by string theoretic considerations, the effects of traversing multiple intervals in field space where massless fields appear along (or nearby) the inflaton trajectory was considered. In the limiting case where these regions appear frequently (while satisfying (79) throughout), a limiting velocity results for the inflaton due to continual particle production as inflation progresses.…”

Section: Light Particle Content and Particle Productionmentioning

confidence: 99%

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

Chluba

Hamann

Patil

2015

Int. J. Mod. Phys. D

212

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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“…In fact, from the best of our knowledge, in the flat FLRW geometry, the only way to have a nonsingular universe which is geodesically complete is in the context of bouncing cosmologies [14], where in order to obtain a bounce one needs to introduce nonstandard matter fields [15] or to go beyond General Relativity [16].…”

Section: Hmentioning

confidence: 99%

Simple inflationary quintessential model

2016

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In the framework of a flat Friedmann-Lemaître-Robertson-Walker (FLRW) geometry, we present a non-geodesically past complete model of our universe without the big bang singularity at finite cosmic time, describing its evolution starting from its early inflationary era up to the present accelerating phase. We found that a hydrodynamical fluid with nonlinear equation of state could result in such scenario, which after the end of this inflationary stage, suffers a sudden phase transition and enters into the stiff matter dominated era, and the universe becomes reheated due to a huge amount of particle production. Finally, it asymptotically enters into the de Sitter phase concluding the present accelerated expansion. Using the reconstruction technique, we also show that, this background provides an extremely simple inflationary quintessential potential whose inflationary part is given by the well-known 1-dimensional Higgs potential, i.e., a Double Well Inflationary potential, and the quintessential one by an exponential potential that leads to a deflationary regime after this inflation, and it can depict the current cosmic acceleration at late times. Moreover the Higgs potential leads to a power spectrum of the cosmological perturbations which fit well with the latest Planck estimations. Further, we compared our viable potential with some known inflationary quintessential potential, which shows that our quintessential model, that is, the Higgs potential combined with the exponential one, is an improved version of them because it contains an analytic solution that allows us to perform all analytic calculations. Finally, we have shown that the introduction of a non zero cosmological constant simplifies the potential considerably with an analytic behavior of the background which again permits us to evaluate all the quantities analytically. INTRODUCTIONThe complete evolution of our universe is still a mystery, and probably, one of the most interesting topics in the history of cosmology. Until now, we have some theories describing different phases of our universe, in agreement with the latest observations, which tell us that our universe underwent a rapid accelerating phase during its very early evolution, namely, the inflation [1, 2], and presently it is going through a phase of accelerated expansion [3,4]. The gap between these two successive accelerating expansions is described by three sequential decelerated phases, the first one is the stiff matter dominated era, then there was a radiation dominated phase, and finally, before its current accelerating phase, the universe was matter dominated. However, since the beginning of modern cosmology, the big bang still remains as one of the controversial issues for cosmologists. Hence, it has been questioned several times, and alternatively, an existence of some kind of "nonsingular" universe (a model of our universe without finite cosmic time singularity) [5] has been proposed just to replace this big bang singularity, but the evolution of the universe will remain same. As a ...

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Particle production during inflation in light of Planck data

Cited by 12 publications

References 213 publications

Effect of transitions in the Planck mass during inflation on primordial power spectra

Effect of transitions in the Planck mass during inflation on primordial power spectra

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

Simple inflationary quintessential model

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