Contributions from primordial non-Gaussianity and general relativity to the galaxy power spectrum

Martinez-Carrillo, Rebeca; Hidalgo, Juan Carlos; Malik, Karim A.; Pourtsidou, Alkistis

doi:10.1088/1475-7516/2021/12/025

Cited by 2 publications

(2 citation statements)

References 69 publications

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“…On the other hand, through a galaxy occupation method (such as HOD [68]), one can probe the galaxy bias parameters which modulate the contribution of the relativistic and PNG terms in the powers spectrum (see e.g. [16,18,69]) and forecast constraints to PNG parameters from the resulting polyspectra (see e.g. [70]).…”

Section: Jcap03(2022)048mentioning

confidence: 99%

Including relativistic and primordial non-Gaussianity contributions in cosmological simulations by modifying the initial conditions

Enríquez

Hidalgo

Valenzuela

2022

J. Cosmol. Astropart. Phys.

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We present a method to implement relativistic corrections to the evolution of dark matter structures in Newtonian simulations of a ΛCDM universe via the initial conditions. We take the nonlinear correspondence between the Lagrangian (Newtonian) evolution of dark matter inhomogeneities and the synchronous-comoving (relativistic) matter density description, and use it to promote the relativistic constraint as the initial condition for numerical simulations of structure formation. In this case, the incorporation of Primordial non-Gaussianity (PNG) contributions as initial conditions is straightforward. We implement the relativistic, f NL and g NL contributions as initial conditions for the L-PICOLA code, and compute the power spectrum and bispectrum of the evolved matter field. We focus specifically on the case of largest values of non-Gaussianity allowed at 1-σ by Planck observations (f NL = −4.2 and g NL = −7000). As a checkup, we show consistency with the one-loop perturbative prescription and with a fully relativistic simulation (GRAMSES) on the adequate scales. Our results confirm that both relativistic and PNG features are most prominent at very large scales and for squeezed triangulations. We discuss future prospects to probe these two contributions in the bispectrum of the matter density distribution.

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Section: Jcap03(2022)048mentioning

confidence: 99%

Including relativistic and primordial non-Gaussianity contributions in cosmological simulations by modifying the initial conditions

Enríquez

Hidalgo

Valenzuela

2022

J. Cosmol. Astropart. Phys.

Self Cite

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“…The much richer phenomenology of inflation however raises the question if optimizing a survey for f loc NL is the same as optimizing for understanding inflation more broadly. For example, degeneracies [151][152][153] and largeangle (systematic) effects [105,[154][155][156][157][158] that limit the local PNG measurement may not impact other changes to the statistics. Similarly, some variations in the observational strategy or target selection may not significantly affect the constraining power on f loc NL , but could yield a vast increase in the insights that we can gain on other inflationary observables.…”

Section: Discussionmentioning

confidence: 99%

Light fields during inflation from BOSS and future galaxy surveys

Green,

Guo,

Han

et al. 2024

J. Cosmol. Astropart. Phys.

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Primordial non-Gaussianity generated by additional fields present during inflation offers a compelling observational target for galaxy surveys. These fields are of significant theoretical interest since they offer a window into particle physics in the inflaton sector. They also violate the single-field consistency conditions and induce a scale-dependent bias in the galaxy power spectrum. In this paper, we explore this particular signal for light scalar fields and study the prospects for measuring it with galaxy surveys. We find that the sensitivities of current and future surveys are remarkably stable for different configurations, including between spectroscopic and photometric redshift measurements. This is even the case at non-zero masses where the signal is not obviously localized on large scales. For realistic galaxy number densities, we demonstrate that the redshift range and galaxy bias of the sample have the largest impact on the sensitivity in the power spectrum. These results additionally motivated us to explore the potentially enhanced sensitivity of Vera Rubin Observatory's LSST through multi-tracer analyses. Finally, we apply this understanding to current data from the last data release of the Baryon Oscillation Spectroscopic Survey (BOSS DR12) and place new constraints on light fields coupled to the inflaton.

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Contributions from primordial non-Gaussianity and general relativity to the galaxy power spectrum

Cited by 2 publications

References 69 publications

Including relativistic and primordial non-Gaussianity contributions in cosmological simulations by modifying the initial conditions

Including relativistic and primordial non-Gaussianity contributions in cosmological simulations by modifying the initial conditions

Light fields during inflation from BOSS and future galaxy surveys

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