Galaxy bispectrum from massive spinning particles

Dizgah, Azadeh Moradinezhad; Lee, Hayden; Muñoz, Julián B.; Dvorkin, Cora

doi:10.1088/1475-7516/2018/05/013

Cited by 78 publications

(82 citation statements)

References 159 publications

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“…5 in Ref. [49]). We take f sky = 0.34 corresponding to a coverage of 14000 deg 2 , and consider the 12 redshift bins in the range of 0.65 ≤ z ≤ 1.65.…”

Section: Methodsmentioning

confidence: 91%

“…We note that since the skew-spectra derived here are only optimal estimators for parameters appearing as amplitudes, in the case of the primordial bispectrum due to massive particles with spin, we fix the mass parameter such that ν = 3. In our previous studies on the observablity of this shape of non-Gaussianity using the galaxy bispectrum [49], we also varied the mass parameter ν.…”

Section: Methodsmentioning

confidence: 99%

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Capturing non-Gaussianity of the large-scale structure with weighted skew-spectra

Dizgah

Lee

Schmittfull

et al. 2020

J. Cosmol. Astropart. Phys.

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The forthcoming generation of wide-field galaxy surveys will probe larger volumes and galaxy densities, thus allowing for a much larger signal-to-noise ratio for higher-order clustering statistics, in particular the galaxy bispectrum. Extracting this information, however, is more challenging than using the power spectrum due to more complex theoretical modeling, as well as significant computational cost of evaluating the bispectrum signal and the error budget. To overcome these challenges, several proxy statistics have been proposed in the literature, which partially or fully capture the information in the bispectrum, while being computationally less expensive than the bispectrum. One such statistics are weighted skew-spectra, which are cross-spectra of the density field and appropriately weighted quadratic fields. Using Fisher forecasts, we show that the information in these skew-spectra is equivalent to that in the bispectrum for parameters that appear as amplitudes in the bispectrum model, such as galaxy bias parameters or the amplitude of primordial non-Gaussianity. We consider three shapes of the primordial bispectrum: local, equilateral and that due to massive particles with spin two during inflation. To obtain constraints that match those from a measurement of the full bispectrum, we find that it is crucial to account for the full covariance matrix of the skew-spectra.

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“…5 in Ref. [49]). We take f sky = 0.34 corresponding to a coverage of 14000 deg 2 , and consider the 12 redshift bins in the range of 0.65 ≤ z ≤ 1.65.…”

Section: Methodsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Capturing non-Gaussianity of the large-scale structure with weighted skew-spectra

Dizgah

Lee

Schmittfull

et al. 2020

J. Cosmol. Astropart. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…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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“…Notice that, as long as we are constraining non-Gaussianity using the halo power spectrum only, any information on the angle between k s and k is lost. One needs to look at the bispectrum [272][273][274][275][276][277][278][279][280][281][282][283][284][285][286][287] or, alternatively, to galaxy shapes [20,21] and intrinsic alignments [22] to be sensitive to it.…”

Section: The Squeezed Limit Of the Primordial Bispectrummentioning

confidence: 99%

The Hunt for Primordial Interactions in the Large-Scale Structures of the Universe

Biagetti

2019

Galaxies

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The understanding of the primordial mechanism that seeded the cosmic structures we observe today in the sky is one of the major goals in cosmology. The leading paradigm for such a mechanism is provided by the inflationary scenario, a period of violent accelerated expansion in the very early stages of evolution of the universe. While our current knowledge of the physics of inflation is limited to phenomenological models which fit observations, an exquisite understanding of the particle content and interactions taking place during inflation would provide breakthroughs in our understanding of fundamental physics at high energies. In this review, we summarize recent theoretical progress in the modeling of the imprint of primordial interactions in the large-scale structures of the universe. We focus specifically on the effects of such interactions on the statistical distribution of dark-matter halos, providing a consistent treatment of the steps required to connect the correlations generated among fields during inflation all the way to the late-time correlations of halos.

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Galaxy bispectrum from massive spinning particles

Cited by 78 publications

References 159 publications

Capturing non-Gaussianity of the large-scale structure with weighted skew-spectra

Capturing non-Gaussianity of the large-scale structure with weighted skew-spectra

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

The Hunt for Primordial Interactions in the Large-Scale Structures of the Universe

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