Theories of Dark Energy with Screening Mechanisms

Abstract

Despite the overwhelming evidence for the existence of dark energy and dark matter, their underlying fundamental physics remains unknown. This review article explores the tantalizing possibility that the dark sector includes new light degrees of freedom that mediate long-range forces on cosmological scales. To ensure consistency with laboratory and solar system tests of gravity, some screening mechanism is necessary to "hide" these degrees of freedom locally. I will focus on two broad classes of screening theories, chameleons and symmetrons, which rely respectively on the scalar field acquiring a large mass or weak coupling in the presence of large ambient matter density.

8 pages. Plenary talk at the 22nd Rencontres de Blois on Particle Physics and Cosmology, Blois, France, July 15-20, 2010. To appear in the conference proceedings

References in corpus (4)

• Multi-field galileons and higher co-dimension branes
• Non-Local Modification of Gravity and the Cosmological Constant Problem
• Stability and superluminality of spherical DBI galileon solutions
• Instabilities of Spherical Solutions with Multiple Galileons and SO(N) Symmetry

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• Halo velocity profiles in screened modified gravity theories
• Realisation of the ultra-slow roll phase in Galileon inflation and PBH overproduction
• Cosmological Constraints on sub-horizon scales modified gravity theories with MGCLASS II
• Stability of scalar perturbations in scalar-torsion $f(T,\varphi )$ gravity theories in the presence of a matter fluid
• Large fluctuations and Primordial Black Holes
• Scalar Fields Near Compact Objects: Resummation versus UV Completion
• Dark Matter Halo Sparsity of Modified Gravity Scenarios
• Towards unveiling the large-scale nature of gravity with the wavelet scattering transform
• Simulating the symmetron: domain walls and symmetry-restoring impurities
• Lectures on Screened Modified Gravity
• Constraining scalar-tensor theories from higher harmonics with GW230529
• Origin & evolution of the Universe
• Hairy Waves: Gravitational Waves in the presence of Screening Mechanism