☆ 4.6 Article

Time-sliced perturbation theory II: baryon acoustic oscillations and infrared resummation

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2016)

期刊

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

卷 -, 期 7, 页码 -

出版社

IOP Publishing Ltd

DOI: 10.1088/1475-7516/2016/07/028

关键词

baryon acoustic oscillations; cosmological perturbation theory; galaxy clustering; power spectrum

类别

Astronomy & Astrophysics Physics, Particles & Fields

资金

INFN
Swiss National Science Foundation
RFBR grant [14-02-00894]

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Reagent

摘要

We use time-sliced perturbation theory (TSPT) to give an accurate description of the infrared non-linear effects affecting the baryonic acoustic oscillations (BAO) present in the distribution of matter at very large scales. In TSPT this can be done via a systematic resummation that has a simple diagrammatic representation and does not involve uncontrollable approximations. We discuss the power counting rules and derive explicit expressions for the resummed matter power spectrum up to next-to leading order and the bispectrum at the leading order. The two-point correlation function agrees well with N-body data at BAO scales. The systematic approach also allows to reliably assess the shift of the baryon acoustic peak due to non-linear effects.

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Detecting stochastic gravitational waves with binary resonance

Diego Blas, Alexander C. Jenkins

Summary: This study presents a new method for calculating the orbital evolution of binary systems and develops statistical formalism for searching gravitational waves in different types of observational data.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Galaxy luminosity function pipeline for cosmology and astrophysics

Nashwan Sabti, Julian B. Munoz, Diego Blas

Summary: Observations of high-redshift galaxies provide a valuable tool for studying the physics of reionization. In this study, the UV galaxy luminosity function is analyzed to extract cosmological and astrophysical parameters. Various uncertainties and systematics, including cosmic variance and dust extinction, are accounted for. The results show weak sensitivity to astrophysical modeling and calibration of the halo mass function. The analysis is validated with mock data from hydrodynamical simulations and provides constraints on astrophysical parameters and the halo-galaxy connection.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Refined ultralight scalar dark matter searches with compact atom gradiometers

Leonardo Badurina, Diego Blas, Christopher McCabe

Summary: This study analyzes and corrects the ULDM signal in vertical atom gradiometers searching for linearly-coupled scalar dark matter. It provides sensitivity estimates for a compact 10 m gradiometer and discusses optimal experimental parameters to enhance the search range. The results show that these devices can explore regions of dark matter parameter space that are not yet constrained.

PHYSICAL REVIEW D (2022)

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