Matter bispectrum in cubic Galileon cosmologies

Journal Article · Fri Mar 01 00:00:00 EST 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/03/034· OSTI ID:22282972

Bartolo, Nicola; Bellini, Emilio; Matarrese, Sabino ^[1]; Bertacca, Daniele ^[2]

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1. Dipartimento di Fisica e Astronomia ''G. Galilei'', Università degli Studi di Padova, via Marzolo 8, I-35131, Padova (Italy)
2. Physics Department, University of the Western Cape, Cape Town 7535 (South Africa)

In this paper we obtain the bispectrum of dark matter density perturbations in the frame of covariant cubic Galileon theories. This result is obtained by means of a semi-analytic approach to second-order perturbations in Galileon cosmologies, assuming Gaussian initial conditions. In particular, we show that, even in the presence of large deviations of the linear growth-rate w.r.t. the ΛCDM one, at the bispectrum level such deviations are reduced to a few percent.

• OSTI ID: 22282972
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
COSMOLOGICAL CONSTANT
COSMOLOGY
DENSITY
DISTURBANCES
NONLUMINOUS MATTER
PERTURBATION THEORY