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10 papers · 2 filters
Black hole induced false vacuum decay: The role of greybody factors
Andrey Shkerin, Sergey Sibiryakov
We study false vacuum decay catalyzed by black holes. We consider a toy two-dimensional model of a scalar field with an unstable potential in the background of a dilaton black hole…
Yoga Dark Energy: Natural Relaxation and Other Dark Implications of a Supersymmetric Gravity Sector
C. P. Burgess, Danielle Dineen, F. Quevedo
We construct a class of 4D `yoga' (naturally relaxed) models for which the gravitational response of heavy-particle vacuum energies is strongly suppressed. The models contain three…
Beta functions of (3+1)-dimensional projectable Horava gravity
Andrei O. Barvinsky, Alexander V. Kurov, Sergey M. Sibiryakov
We derive the full set of beta functions for the marginal essential couplings of projectable Horava gravity in (3 + 1)-dimensional spacetime. To this end we compute the divergent p…
Who's Afraid of the Supersymmetric Dark? The Standard Model vs Low-Energy Supergravity
C. P. Burgess, F. Quevedo
Use of supergravity equations in astronomy and late-universe cosmology is often criticized on three grounds: (i) phenomenological success usually depends on the supergravity form f…
Axion Homeopathy: Screening Dilaton Interactions
C. P. Burgess, F. Quevedo
Cosmologically active Brans-Dicke (or dilaton) scalar fields are generically ruled out by solar system tests of gravity unless their couplings to ordinary matter are much suppresse…
Exact effective action for the O(N) vector model in the large N limit
Han Ma, Sung-Sik Lee
We present the Wilsonian effective action as a solution of the exact RG equation for the critical vector model in the large limit. Below four dimensions, the exact effec…