Jointly fitting weak lensing, X-ray and Sunyaev-Zel’dovich data to constrain scalar-tensor theories with clusters of galaxies. (arXiv:2008.00580v1 [astro-ph.CO])

Jointly fitting weak lensing, X-ray and Sunyaev-Zel’dovich data to constrain scalar-tensor theories with clusters of galaxies. (arXiv:2008.00580v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Cardone_V/0/1/0/all/0/1">Vincenzo F. Cardone</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Karmakar_P/0/1/0/all/0/1">Purnendu Karmakar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Petris_M/0/1/0/all/0/1">Marco De Petris</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Maoli_R/0/1/0/all/0/1">Roberto Maoli</a>

Degenerate higher-order scalar-tensor (DHOST) theories are considered the
most general class of scalar-tensor theories so that any constraints on them
apply to the full set of scalar-tensor models. DHOST theories modify the laws
of gravity even at galaxy clusters scale hence affecting the weak lensing (WL),
X-ray and Sunyaev-Zel’dovich observables. We derive the theoretical expression
for the lensing convergence $kappa$, and the pressure profile $P$, of clusters
in the framework of DHOST theories, and quantify how much they deviate from
their General Relativity (GR) counterparts. We argue that combined measurements
of $kappa$, $P$, and of the electron number density, $n_e$, can constrain both
the cluster and DHOST theory parameters. We carry on a Fisher matrix forecasts
analysis to investigate whether this is indeed the case considering different
scenarios for the spatial resolution and errors on the measured quantities.

Degenerate higher-order scalar-tensor (DHOST) theories are considered the
most general class of scalar-tensor theories so that any constraints on them
apply to the full set of scalar-tensor models. DHOST theories modify the laws
of gravity even at galaxy clusters scale hence affecting the weak lensing (WL),
X-ray and Sunyaev-Zel’dovich observables. We derive the theoretical expression
for the lensing convergence $kappa$, and the pressure profile $P$, of clusters
in the framework of DHOST theories, and quantify how much they deviate from
their General Relativity (GR) counterparts. We argue that combined measurements
of $kappa$, $P$, and of the electron number density, $n_e$, can constrain both
the cluster and DHOST theory parameters. We carry on a Fisher matrix forecasts
analysis to investigate whether this is indeed the case considering different
scenarios for the spatial resolution and errors on the measured quantities.

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