Abstract / Description of output
We explore the signatures of quintessence and modified gravity theories
in the relativistic description of galaxy clustering within a
parametrized post-Friedmann framework. For this purpose, we develop a
calibration method to consistently account for horizon-scale effects in
the linear parametrized post-Friedmann perturbations of minimally and
nonminimally coupled scalar-tensor theories and test it against the full
model-specific fluctuations. We further study the relativistic effects
in galaxy clustering for the normal and self-accelerating branches of
the Dvali-Gabadadze-Porrati braneworld model as well as for
phenomenological modifications of gravity. We quantify the impact of
modified gravity and dark energy models on galaxy clustering by
computing the velocity-to-matter density ratio F, the velocity
contribution R, and the potential contribution P and give an estimate of
their detectability in future galaxy surveys. Our results show that, in
general, the relativistic correction contains additional information on
gravity and dark energy, which needs to be taken into account in
consistent horizon-scale tests of departures from ΛCDM using the
galaxy-density field.
Original language | English |
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Pages (from-to) | 104019 |
Journal | Physical Review D, particles, fields, gravitation, and cosmology |
Volume | 87 |
Publication status | Published - 1 May 2013 |
Keywords / Materials (for Non-textual outputs)
- Modified theories of gravity
- Mathematical and relativistic aspects of cosmology
- Galaxy clusters
- Relativity and gravitation