Cluster-Void Degeneracy Breaking: Modified Gravity in the Balance

  title={Cluster-Void Degeneracy Breaking: Modified Gravity in the Balance},
  author={Martin Sahl'en and Joseph I. Silk},
  journal={Physical Review D},
Combining galaxy cluster and void abundances is a novel, powerful way to constrain deviations from General Relativity and the $\Lambda$CDM model. For a flat $w$CDM model with growth of large-scale structure parameterized by the redshift-dependent growth index $\gamma(z) = \gamma_0 + \gamma_1 z/(1+z)$ of linear matter perturbations, combining void and cluster abundances in future surveys with Euclid and the 4-metre Multi-Object Spectroscopic Telescope (4MOST) could improve the Figure of Merit… 

Figures and Tables from this paper

Cosmic voids in modified gravity models with massive neutrinos

Cosmic voids are progressively emerging as a new viable cosmological probe. Their abundance and density profiles are sensitive to modifications of gravity, as well as to dark energy and neutrinos.

Non-comoving baryons and cold dark matter in cosmic voids

We examine the fully relativistic evolution of cosmic voids constituted by baryons and cold dark matter (CDM), represented by two non-comoving dust sources in a $$\varLambda $$ΛCDM background. For

Study of cubic Galileon gravity using N -body simulations

We use N-body simulation to study the structure formation in the Cubic Galileon Gravity model where along with the usual kinetic and potential term we also have a higher derivative self-interaction

Cosmic voids: a novel probe to shed light on our Universe.

Cosmic voids, the less dense patches of the Universe, are promising laboratories to extract cosmological information. Thanks to their unique low density character, voids are extremely sensitive to

Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

Voids are promising cosmological probes. Nevertheless, every cosmological test based on voids must necessarily employ methods to identify them in redshift space. Therefore, redshift-space distortions

Cosmological exploitation of the size function of cosmic voids identified in the distribution of biased tracers

Cosmic voids are large underdense regions that, together with galaxy clusters, filaments and walls, build-up the large-scale structure of the Universe. The void size function provides a powerful

Cosmological exploitation of cosmic void statistics. New numerical tools in the CosmoBolognaLib to extract cosmological constraints from the void size function

New methods to model the size function of cosmic voids are implemented, in both observed and simulated samples of dark matter and biased tracers, to allow a high versatility in comparing independent results.

Galaxy clusters and cosmic voids in modified gravity scenarios

The so-called 'cosmic web', comprising cosmic voids and galaxy clusters, has been proven to be extremely sensitive to deviations from General Relativity. This could be further investigated by futur

Non-comoving baryons and cold dark matter in cosmic voids

We examine the fully relativistic evolution of cosmic voids constituted by baryons and cold dark matter (CDM), represented by two non-comoving dust sources in a Λ\documentclass[12pt]{minimal}




Combining galaxy cluster and void abundances breaks the degeneracy between mean matter density &OHgr; m ?> and power-spectrum normalization &sgr; 8 ?> . For the first time for voids, we constrain

Future Galaxy Cluster Surveys: The Effect of Theory Uncertainty on Constraining Cosmological Parameters

Using the Fisher matrix formalism, we quantitatively investigate the constraints on a 10-dimensional space of cosmological parameters, which may be obtained with future cluster surveys. We explore

Cosmological Parameters from Observations of Galaxy Clusters

Studies of galaxy clusters have proved crucial in helping to establish the standard model of cosmology, with a Universe dominated by dark matter and dark energy. A theoretical basis that describes

Counting voids to probe dark energy

We show that the number of observed voids in galaxy redshift surveys is a sensitive function of the equation of state of dark energy. Using the Fisher matrix formalism we find the error ellipses in

Growth index after the Planck results

The growth index gamma L was proposed to investigate the possible deviation from the standard Lambda CDM model and Einstein's gravity theory in a dynamical perspective. Recently, thanks to the

A combined measurement of cosmic growth and expansion from clusters of galaxies, the CMB and galaxy clustering

Combining galaxy cluster data from the ROSAT All-Sky Survey and the Chandra Xray Observatory, cosmic microwave background data from the Wilkinson Microwave Anisotropy Probe, and galaxy clustering

Next Generation Cosmology: Constraints from the Euclid Galaxy Cluster Survey

We study the characteristics of the galaxy cluster samples expected from the European Space Agency's Euclid satellite and forecast constraints on parameters describing a variety of cosmological

Conjoined constraints on modified gravity from the expansion history and cosmic growth

In this paper we present conjoined constraints on several cosmological models from the expansion history $H(z)$ and cosmic growth $f\sigma_8(z)$. The models we study include the CPL $w_0w_a$

The XMM Cluster Survey: forecasting cosmological and cluster scaling-relation parameter constraints

We forecast the constraints on the values of s8, Om and cluster scaling-relation parameters which we expect to obtain from the XMM Cluster Survey (XCS). We assume a flat cold dark matter Universe and

Voids in massive neutrino cosmologies

Cosmic voids are a promising environment to characterize neutrino-induced effects on the large-scale distribution of matter in the universe. We perform a comprehensive numerical study of the