STRUCTURE FORMATION IN THE SYMMETRON MODEL
Anne-Christine DavisDAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UKBaojiu LiDAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UKDavid F. MotaInstitute of Theoretical Astrophysics, University of Oslo, 0315 Oslo, NorwayHans A. WintherInstitute of Theoretical Astrophysics, University of Oslo, 0315 Oslo, Norway
2012en
ABI
Abstract
Scalar fields, strongly coupled to matter, can be present in nature and still be invisible to local experiments if they are subject to a screening mechanism. The symmetron is one such mechanism that relies on restoration of a spontaneously broken symmetry in regions of high density to shield the scalar fifth force. We have investigated structure formation in the symmetron model by using N-body simulations and find observable signatures in both the linear and nonlinear matter power spectrum and on the halo mass function. The mechanism for suppressing the scalar fifth force in high-density regions is also found to work very well.\nReproduced with permission from the Astrophysical Journal. © IOP Publishing
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