Volume 584, December 2015
|Number of page(s)||9|
|Section||Cosmology (including clusters of galaxies)|
|Published online||20 November 2015|
Cosmological simulations with hydrodynamics of screened scalar-tensor gravity with non-universal coupling
Institute of Theoretical Astrophysics, University of Oslo,
PO Box 1029 Blindern,
e-mail: email@example.com; firstname.lastname@example.org
Received: 26 May 2015
Accepted: 2 October 2015
Aims. We study the effects of letting dark matter and gas in the Universe couple to the scalar field of the symmetron model, a modified gravity theory, with varying coupling strength. We also search for a way to distinguish between universal and non-universal couplings in observations.
Methods. The research is performed utilising a series of hydrodynamic, cosmological N-Body simulations, studying the resulting power spectra and galaxy halo properties, such as density and temperature profiles.
Results. In the cases of universal couplings, the deviations in the baryon fraction from ΛCDM are smaller than in the cases of non-universal couplings throughout the halos. The same is apparent in the power spectrum baryon bias, defined as the ratio of gas to dark matter power spectrum. Deviations of the density profiles and power spectra from the ΛCDM reference values can differ significantly between dark matter and gas because the dark matter deviations are mostly larger than the deviations in the gas.
Key words: hydrodynamics / galaxies: halos / gravitation / cosmology: theory / large-scale structure of Universe
© ESO, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.