Probing higher-spin fields from inflation with higher-order statistics of the CMB

Bordin, Lorenzo; Cabass, Giovanni

doi:10.1088/1475-7516/2019/06/050

Cited by 18 publications

(19 citation statements)

References 38 publications

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“…One of the most striking results of this research program is the non-Gaussianity due to higher spin particles, and in particular the angular dependence ζζζ ∝ P s (cos θ) due to the exchange of a single spin-s boson [12]. This prompted a flurry of activity, and possibilities for observing [86][87][88][89][90][91][92][93][94] the signature of higher spin particles.…”

Section: Discussionmentioning

confidence: 99%

Higher spin supersymmetry at the cosmological collider: sculpting SUSY rilles in the CMB

Alexander

Gates

Jenks

et al. 2019

J. High Energ. Phys.

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We study the imprint of higher spin supermultiplets on cosmological correlators, namely the non-Gaussianity of the cosmic microwave background. Supersymmetry is used as a guide to introduce the contribution of fermionic higher spin particles, which have been neglected thus far in the literature. This necessarily introduces more than just a single additional fermionic superpartner, since the spectrum of massive, higher spin supermultiplets includes two propagating higher spin bosons and two propagating higher spin fermions, which all contribute to the three point function. As an example we consider the half-integer superspin Y = s + 1/2 supermultiplet, which includes particles of spin values j = s + 1, j = s + 1/2, j = s + 1/2 and j = s. We compute the curvature perturbation 3-point function for higher spin particle exchange and find that the known P s (cos θ) angular dependence is accompanied by superpartner contributions that scale as P s+1 (cos θ) and m P m s (cos θ), with P s and P m s defined as the Legendre and Associated Legendre polynomials respectively. We also compute the tensor-scalar-scalar 3-point function, and find a complicated angular dependence as an integral over products of Legendre and associated Legendre polynomials.

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Section: Discussionmentioning

confidence: 99%

Higher spin supersymmetry at the cosmological collider: sculpting SUSY rilles in the CMB

Alexander

Gates

Jenks

et al. 2019

J. High Energ. Phys.

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“…This will be explored in some depth in an upcoming publication (Kalaja et al). See also Bordin and Cabass[82] and Babich and Zaldarriaga[74] for some further insights.…”

mentioning

confidence: 99%

The primordial information content of Rayleigh Anisotropies

Coulton,

Beringue,

Meerburg

2020

Preprint

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Anisotropies in the cosmic microwave background (CMB) are primarily generated by Thomson scattering of photons by free electrons. Around the time of recombination, the Thomson scattering probability quickly diminishes as the free electrons combine with protons to form neutral hydrogen. This production of neutral hydrogen enables a new type of scattering to occur: Rayleigh scattering of photons by hydrogen atoms. Unlike Thomson scattering, Rayleigh scattering is frequency dependent resulting in the generation of anisotropies with a different spectral dependence. Unfortunately the Rayleigh scattering efficiency rapidly decreases with the expansion of the neutral universe, with the result that only a small percentage of photons are scattered off of neutral hydrogen after recombination. Although the effect is very small, future CMB missions with higher sensitivity and improved frequency coverage are poised to measure the effect of Rayleigh scattering. The uncorrelated component of the Rayleigh anisotropies contains unique information on the primordial perturbations that could potentially be leveraged to expand our knowledge of the early universe. In this paper we explore whether measurements of Rayleigh scattering anisotropies can be used to constrain primordial non-Gaussianity and examine the hints of anomalies found by WMAP and Planck satellites. We show that the additional Rayleigh information has the potential to improve primordial non-Gaussianity constraints over pure Thompson constraints by 30%, or more. Primordial bispectra that are not of the local type benefit the most from these additional scatterings, which we attribute to the different scale dependence of the Rayleigh anisotropies. Unfortunately this different scaling means that Rayleigh measurements can not be used to constrain anomalies or features on large scales. On the other hand, anomalies that may persist to smaller scales, such as the potential power asymmetry seen in WMAP and Planck, could be improved by the addition of Rayleigh measurements.

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“…This will be explored in some depth in an upcoming publication (Kalaja et al). See also Bordin and Cabass [83] and Babich and Zaldarriaga [75] for some further insights. expectations from mode counting.…”

Section: Results: Primordial Non-gaussianity Constraints With Rayleigh Scatteringmentioning

confidence: 99%

Primordial information content of Rayleigh anisotropies

Coulton

Beringue²,

Meerburg

2021

Phys. Rev. D

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Anisotropies in the cosmic microwave background (CMB) are primarily generated by Thomson scattering of photons by free electrons. Around the time of recombination, the Thomson scattering probability quickly diminishes as the free electrons combine with protons to form neutral hydrogen. This production of neutral hydrogen enables a new type of scattering to occur: Rayleigh scattering of photons by hydrogen atoms. Unlike Thomson scattering, Rayleigh scattering is frequency dependent resulting in the generation of anisotropies with a different spectral dependence. Unfortunately the Rayleigh scattering efficiency rapidly decreases with the expansion of the neutral universe, with the result that only a small percentage of photons are scattered off of neutral hydrogen after recombination. Although the effect is very small, future CMB missions with higher sensitivity and improved frequency coverage are poised to measure the effect of Rayleigh scattering. The uncorrelated component of the Rayleigh anisotropies contains unique information on the primordial perturbations that could potentially be leveraged to expand our knowledge of the early universe. In this paper we explore whether measurements of Rayleigh scattering anisotropies can be used to constrain primordial non-Gaussianity and examine the hints of anomalies found by WMAP and Planck satellites. We show that the additional Rayleigh information has the potential to improve primordial non-Gaussianity constraints over pure Thompson constraints by 30%, or more. Primordial bispectra that are not of the local type benefit the most from these additional scatterings, which we attribute to the different scale dependence of the Rayleigh anisotropies. Unfortunately this different scaling means that Rayleigh measurements cannot be used to constrain anomalies or features on large scales. On the other hand, anomalies that may persist to smaller scales, such as the potential power asymmetry seen in WMAP and Planck, could be improved by the addition of Rayleigh scattering measurements.

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Probing higher-spin fields from inflation with higher-order statistics of the CMB

Cited by 18 publications

References 38 publications

Higher spin supersymmetry at the cosmological collider: sculpting SUSY rilles in the CMB

Higher spin supersymmetry at the cosmological collider: sculpting SUSY rilles in the CMB

The primordial information content of Rayleigh Anisotropies

Primordial information content of Rayleigh anisotropies

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