Inflationary perturbation theory is geometrical optics in phase space

Seery, David; Mulryne, David J.; Frazer, Jonathan; Ribeiro, Raquel H.

doi:10.1088/1475-7516/2012/09/010

Cited by 62 publications

(162 citation statements)

References 99 publications

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“…The main feature of the multifield models which leads to nonstandard primordial spectrum is the ability of trajectories of slow-roll fields to rotate in the field space, that occurs due to the presence of bumps and ridges in the effective multifield potential. When the slow-roll field trajectories turn in the field space, nonstandard contributions to primordial spectra can be amplified enough to be detectable in the microwave background [52][53][54].…”

Section: Jhep12(2017)036mentioning

confidence: 99%

MSSM-inspired multifield inflation

Dubinin

Петрова

Pozdeeva

et al. 2017

J. High Energ. Phys.

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Despite the fact that experimentally with a high degree of statistical significance only a single Standard Model-like Higgs boson is discovered at the LHC, extended Higgs sectors with multiple scalar fields not excluded by combined fits of the data are more preferable theoretically for internally consistent realistic models of particle physics. We analyze the inflationary scenarios which could be induced by the two-Higgs-doublet potential of the Minimal Supersymmetric Standard Model (MSSM) where five scalar fields have non-minimal couplings to gravity. Observables following from such MSSM-inspired multifield inflation are calculated and a number of consistent inflationary scenarios are constructed. Cosmological evolution with different initial conditions for the multifield system leads to consequences fully compatible with observational data on the spectral index and the tensor-to-scalar ratio. It is demonstrated that the strong coupling approximation is precise enough to describe such inflationary scenarios.

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Section: Jhep12(2017)036mentioning

confidence: 99%

MSSM-inspired multifield inflation

Dubinin

Петрова

Pozdeeva

et al. 2017

J. High Energ. Phys.

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“…[62], where ζ is evaluated by evolving the field correlation functions from horizon-crossing to the time of interest, then gauge-transforming to ζ on uniform energy hypersurface. For model examples, see [59,72]. In particular, one can see that the second terms in the moment transport expressions Eqs.…”

Section: B Relation Between τNl and Gnlmentioning

confidence: 99%

Influence of reheating on the trispectrum and its scale dependence

Leung¹,

Tarrant²,

Byrnes³

et al. 2013

J. Cosmol. Astropart. Phys.

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We study the evolution of the non-linear curvature perturbation during perturbative reheating, and hence how observables evolve to their final values which we may compare against observations. Our study includes the evolution of the two trispectrum parameters, gNL and τNL, as well as the scale dependence of both fNL and τNL. In general the evolution is significant and must be taken into account, which means that models of multifield inflation cannot be compared to observations without specifying how the subsequent reheating takes place. If the trispectrum is large at the end of inflation, it normally remains large at the end of reheating. In the classes of models we study, it remains very hard to generate τNL f 2 NL , regardless of the decay rates of the fields. Similarly, for the classes of models in which gNL τNL during slow-roll inflation, we find the relation typically remains valid during reheating. Therefore it is possible to observationally test such classes of models without specifying the parameters of reheating, even though the individual observables are sensitive to the details of reheating. It is hard to generate an observably large gNL however. The runnings, n f NL and nτ NL , tend to satisfy a consistency relation nτ NL = (3/2)n f NL regardless of the reheating timescale, but are in general too small to be observed for the class of models considered.

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“…The ensemble of separate universes can then be intuitively described as a 'bundle' in phase space (for a more detailed description see for example Refs. [57,58] and references therein), and the evolution of this bundle encodes all the information we require about the perturbed Universe.…”

Section: Background Theorymentioning

confidence: 99%

What Planck does not tell us about inflation

2013

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Planck data has not found the 'smoking gun' of non-Gaussianity that would have necessitated consideration of inflationary models beyond the simplest canonical single field scenarios. This raises the important question of what these results do imply for more general models, and in particular, multi-field inflation. In this paper we revisit four ways in which two-field scenarios can behave differently from single field models; two-field slow-roll dynamics, curvaton-type behaviour, inflation ending on an inhomogeneous hypersurface and modulated reheating. We study the constraints that Planck data puts on these classes of behaviour, focusing on the latter two which have been least studied in the recent literature. We show that these latter classes are almost equivalent, and extend their previous analyses by accounting for arbitrary evolution of the isocurvature mode which, in particular, places important limits on the Gaussian curvature of the reheating hypersurface. In general, however, we find that Planck bispectrum results only constrain certain regions of parameter space, leading us to conclude that inflation sourced by more than one scalar field remains an important possibility.

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Inflationary perturbation theory is geometrical optics in phase space

Cited by 62 publications

References 99 publications

MSSM-inspired multifield inflation

MSSM-inspired multifield inflation

Influence of reheating on the trispectrum and its scale dependence

What Planck does not tell us about inflation

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