Pre-inflationary relics in the CMB?

Gruppuso, A.; Kitazawa, Noriaki; Mandolesi, N.; Natoli, P.; Sagnotti, A.

doi:10.1016/j.dark.2015.12.001

Cited by 53 publications

(83 citation statements)

References 66 publications

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“…[4] (see also [47,[50][51][52][53][55][56][57] for a nonexhaustive list of works analyzing features with P lanck data). In table 1 we show for each models the best-fit parameters for the standard cosmological parameters and for the extra parameters obtained with P lanck TT + lowP [4].…”

Section: Current Constraints From Cmbmentioning

confidence: 99%

Probing primordial features with future galaxy surveys

Ballardini

Finelli⋆

Fedeli

et al. 2016

J. Cosmol. Astropart. Phys.

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Abstract. We study the capability of future measurements of the galaxy clustering power spectrum to probe departures from a power-law spectrum for primordial fluctuations. On considering the information from the galaxy clustering power spectrum up to quasi-linear scales, i.e. k < 0.1 h Mpc −1 , we present forecasts for DESI, Euclid and SPHEREx in combination with CMB measurements. As examples of departures in the primordial power spectrum from a simple power-law, we consider four P lanck 2015 best-fits motivated by inflationary models with different breaking of the slowroll approximation. These four representative models provide an improved fit to CMB temperature anisotropies, although not at statistical significant level. As for other extensions in the matter content of the simplest ΛCDM model, the complementarity of the information in the resulting matter power spectrum expected from these galaxy surveys and in the primordial power spectrum from CMB anisotropies can be effective in constraining cosmological models. We find that the three galaxy surveys can add significant information to CMB to better constrain the extra parameters of the four models considered.

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Section: Current Constraints From Cmbmentioning

confidence: 99%

Probing primordial features with future galaxy surveys

Ballardini

Finelli⋆

Fedeli

et al. 2016

J. Cosmol. Astropart. Phys.

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“…We came to it from a different perspective in [17,19,24], and the work in [32] differs from previous or other present approaches in three respects: the well-motivated parametrization in eqs. (4.3) and (4.4), the use of the best available data from Planck 2013 and from Planck 2015, including polarization effects, and above all the use of a sequence of wider Galactic masks.…”

Section: )mentioning

confidence: 99%

“…On the other hand, if ∆ is not introduced, widening the mask does affect the determinations to some extent. In [32] we thus obtained, with f sky = 39%, the optimal detection ∆ = (0.351 ± 0.114) × 10 5) which corresponds to about 99% CL and to the red curves in fig. 7.…”

Section: )mentioning

confidence: 99%

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Low-ℓ CMB from string-scale SUSY breaking?

Sagnotti

2016

Mod. Phys. Lett. A

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Models of inflation are instructive playgrounds for supersymmetry breaking in Supergravity and String Theory. In particular, combinations of branes and orientifolds that are not mutually BPS can lead to brane supersymmetry breaking, a phenomenon where non-linear realizations are accompanied, in tachyon-free vacua, by the emergence of steep exponential potentials. When combined with milder terms, these exponentials can lead to slow-roll after a fast ascent and a turning point. This leaves behind distinctive patterns of scalar perturbations, where pre-inflationary peaks can lie well apart from an almost scale invariant profile. I review recent attempts to connect these power spectra to the low-ℓ CMB, and a corresponding one-parameter extension of ΛCDM with a low-frequency cut ∆. A detailed likelihood analysis led to ∆ = (0.351 ± 0.114) × 10 −3 Mpc −1 , at 99.4% confidence level, in an extended Galactic mask with f sky = 39%, to be compared with a nearby value at 88.5% in the standard Planck 2015 mask with f sky = 94%. In these scenarios one would be confronted, in the CMB, with relics of an epoch of deceleration that preceded the onset of slow-roll.

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“…We now elaborate on a possible fundamental origin for this effect. 40,41 Lack of power at large angular scales is a typical manifestation of early departures from slowroll, which follow naturally the emergence from an initial singularity. As explained in Refs.…”

Section: 39mentioning

confidence: 99%

Recent results and perspectives on cosmology and fundamental physics from microwave surveys

Burigana

Battistelli

Benetti

et al. 2017

The Fourteenth Marcel Grossmann Meeting

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Recent cosmic microwave background (CMB) data in temperature and polarization have reached high precision in estimating all the parameters that describe the current socalled standard cosmological model. Recent results about the integrated Sachs-Wolfe (ISW) effect from CMB anisotropies, galaxy surveys, and their cross-correlations are presented. Looking at fine signatures in the CMB, such as the lack of power at low multipoles, the primordial power spectrum (PPS) and the bounds on non-Gaussianities, complemented by galaxy surveys, we discuss inflationary physics and the generation of primordial perturbations in the early universe. Three important topics in particle physics, the bounds on neutrinos masses and parameters, on thermal axion mass and on the neutron lifetime derived from cosmological data are reviewed, with attention to the comparison with laboratory experiment results. Recent results from cosmic polarization rotation (CPR) analyses aimed at testing the Einstein equivalence principle (EEP) are presented. Finally, we discuss the perspectives of next radio facilities for the improvement of the analysis of future CMB spectral distortion experiments.Keywords: Cosmology; background radiations; radio; microwave; origin and formation of the universe; particle-theory and field-theory models of the early universe; observational cosmology; large scale structure of the universe; dark matter; dark energy; elementary particle processes.

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Pre-inflationary relics in the CMB?

Cited by 53 publications

References 66 publications

Probing primordial features with future galaxy surveys

Probing primordial features with future galaxy surveys

Low-ℓ CMB from string-scale SUSY breaking?

Recent results and perspectives on cosmology and fundamental physics from microwave surveys

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