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Testing Horndeski gravity as dark matter with hi_class

Alessandro Casalino
(
- Trento U. and
- TIFPA-INFN, Trento
)
,
Massimiliano Rinaldi
(
- Trento U. and
- TIFPA-INFN, Trento
)

Jul 4, 2018

23 pages

Published in:

Phys.Dark Univ. 23 (2019) 100243

Published: Jan, 2019

e-Print:

1807.01995 [gr-qc]

DOI:

10.1016/j.dark.2018.11.004 (publication)

View in:

ADS Abstract Service

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Abstract: (Elsevier)

We consider a model of dark matter fluid based on a sector of Horndeski gravity. The model is very successful, at the background level, in reproducing the evolution of the Universe from early times to today. However, at the perturbative level the model fails. To show this, we use the code hi_class and we compute the matter power spectrum and the cosmic microwave background spectrum. Our results confirm, in a new and independent way, that this sector of Horndeski gravity is not viable to describe dark matter, in agreement with the recent constraints coming from the measurement of the speed of gravitational waves obtained from the observation of the neutron star merger event GW170817.

Note:

23 pages, 18 figures. References added, minor corrections, version accepted for publication in Physics of The Dark Universe

cosmic background radiation: spectrum
matter: power spectrum
gravitation: model
dark matter
gravitational radiation
neutron star
numerical calculations

References(24)

Figures(18)

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