Unique Fingerprints of Alternatives to Inflation in the Primordial Power Spectrum

Chen, Xingang; Loeb, Abraham; Xianyu, Zhong-Zhi

doi:10.1103/physrevlett.122.121301

Cited by 34 publications

(30 citation statements)

References 91 publications

(129 reference statements)

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“…By measuring a particular "channel"the squeezed limit -of 3-point function, one could extract the mass of the heavy particle as resonance peaks [8,9,12] and its spin as angular distribution [12][13][14] of the correlation. Related ideas can turn the very early universe physics into classical [15][16][17] and quantum [18,19] standard clocks to measure the expansion history of the very early universe.…”

Section: Introductionmentioning

confidence: 99%

A cosmological Higgs collider

Wang

Xianyu

2020

J. High Energ. Phys.

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The quantum fluctuations of the Higgs field during inflation could be a source of primordial density perturbations through Higgs-dependent inflaton decay. By measuring primordial non-Gaussianities, this so-called Higgs-modulated reheating scenario provides us a unique chance to probe Higgs interactions at extremely high energy scale, which we call the Cosmological Higgs Collider (CHC). We realize CHC in a simple scenario where the inflaton decays into Higgs-portal scalars, taking account of the decay of the Higgs fluctuation amplitude after inflation. We also calculate the CHC signals of Standard Model particles, namely their imprints in the squeezed bispectrum, which can be naturally large. The concept of CHC can be straightforwardly generalized to cosmological isocurvature colliders with other types of isocurvature perturbations.

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Section: Introductionmentioning

confidence: 99%

A cosmological Higgs collider

Wang

Xianyu

2020

J. High Energ. Phys.

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“…This is the focus of the "cosmological collider physics" program [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. For various recent ideas in this direction see, [18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Cosmological collider physics and the curvaton

Kumar

Sundrum

2020

J. High Energ. Phys.

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Primordial non-Gaussianity signatures of extremely heavy particles are reexamined within a simple alternative to the standard inflationary paradigm, in which the primordial fluctuations and the inflationary spacetime expansion are sourced by two different fields. The curvaton scenario provides an example of this in which the distinct roles are played by the curvaton and the inflaton fields, respectively. We study couplings of the curvaton to heavy particles with masses of order the inflationary Hubble scale, and show that they can lead to non-Gaussian signals orders of magnitude larger than those in standard inflation, consistent with explicit effective field theory control of inflationary dynamics. This brings various motivated particle physics signatures, such as loops of heavy gauge-charged scalars and fermions, within future observational reach. The curvaton paradigm can be viewed as a partial UV completion of effective field theories of only inflationary fluctuations in which large non-Gaussian signals of heavy particles have also been discussed, but in which inflationary dynamics is not explicitly derived.

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“…See Refs. [13,32] for a power-law dependence in k in alternatives scenarios to inflation. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Lensing anomaly and oscillations in the primordial power spectrum

Domènech

Kamionkowski

2019

J. Cosmol. Astropart. Phys.

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The latest analysis of the cosmic microwave background by the Planck team finds more smoothing of the acoustic peaks in the temperature power spectrum than predicted by ΛCDM. Here we investigate whether this additional smoothing can be mimicked by an oscillatory feature, generated during inflation, that is similar to the acoustic peaks but out of phase. We consider oscillations generated by oscillating modulations of the background-e.g., due to heavy fields or modulated potentials-and by sharp features. We show that it is difficult to induce oscillations that are linear (or almost linear) in k by oscillatory modulations of the background. We find, however, that a sharp bumpy feature in the sound speed of perturbations is able to produce the desired oscillations. The scenario can be tested by combining CMB and BAO data. * domenech@thphys.uni-heidelberg.de † kamion@jhu.edu 1 A L parametrizes a rescaling of the lensing power spectrum such that A L = 1 for ΛCDM [5].

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Unique Fingerprints of Alternatives to Inflation in the Primordial Power Spectrum

Cited by 34 publications

References 91 publications

A cosmological Higgs collider

A cosmological Higgs collider

Cosmological collider physics and the curvaton

Lensing anomaly and oscillations in the primordial power spectrum

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