Second-order peculiar velocity field as a novel probe of scalar-tensor theories

Abstract

We investigate the galaxy bispectrum induced by the nonlinear gravitational evolution as a possible probe to constrain degenerate higher-order scalar tensor (DHOST) theories. We find that the signal obtained from the leading kernel of second-order density fluctuations is partially hidden by the uncertainty in the nonlinear galaxy bias, and that the kernel of second-order velocity fields instead provides unbiased information on the modification of gravity theory. Based on this fact, we propose new phenomenological time-dependent functions, written as a combination of the coefficients of the second-order kernels, which is expected to trace the higher-order growth history. We then present approximate expressions for these variables in terms of parameters that characterize the DHOST theories. We also show that the resultant formulae provides new constraints on the parameter space of the DHOST theories.

19 pages, 3 figures, accepted for publication in Physical Review D

References in corpus (15)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Horndeski theory and beyond: a review
• Degenerate higher order scalar-tensor theories beyond Horndeski up to cubic order
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological implications of the configuration-space clustering wedges
• Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Cosmological implications of the Fourier space wedges of the final sample
• Modified gravity inside astrophysical bodies
• Vainshtein regime in Scalar-Tensor gravity: constraints on DHOST theories
• Towards a self-consistent analysis of the anisotropic galaxy two- and three-point correlation functions on large scales: application to mock galaxy catalogues
• Constraining modified theory of gravity with galaxy bispectrum
• On the screening mechanism in DHOST theories evading gravitational wave constraints
• Testing gravity theories with cosmic microwave background in the degenerate higher-order scalar-tensor theory
• Constraining DHOST theories with linear growth of matter density fluctuations
• UV sensitive one-loop matter power spectrum in degenerate higher-order scalar-tensor theories

Cited by in corpus (5)

• New constraints on cosmological modified gravity theories from anisotropic three-point correlation functions of BOSS DR12 galaxies
• First test of the consistency relation for the large-scale structure using the anisotropic three-point correlation function of BOSS DR12 galaxies (An explanatory video is available at https://youtu.be/Zi36ooLPhss.)
• Skewness consistency relation in large-scale structure and test of gravity theory
• Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys
• Probing gravity beyond general relativity with bispectrum multipoles of cosmological tracers: I. Theoretical Foundations