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27 papers · 2 filters
Stability in Einstein-Scalar Gravity with a Logarithmic Branch
Aaron J. Amsel, Matthew M. Roberts
We investigate the non-perturbative stability of asymptotically anti-de Sitter gravity coupled to tachyonic scalar fields with mass saturating the Breitenlohner-Freedman bound. Suc…
A Proof Of Ghost Freedom In de Rham-Gabadadze-Tolley Massive Gravity
Mehrdad Mirbabayi
We identify different helicity degrees of freedom of Fierz-Paulian massive gravity around generic backgrounds. We show that the two-parameter family proposed by de Rham, Gabadadze,…
On Black Holes in Massive Gravity
L. Berezhiani, G. Chkareuli, C. de Rham +2
In massive gravity the so-far-found black hole solutions on Minkowski space happen to convert horizons into a certain type of singularities. Here we explore whether these singulari…
Universality of the Volume Bound in Slow-Roll Eternal Inflation
Sergei Dubovsky, Leonardo Senatore, Giovanni Villadoro
It has recently been shown that in single field slow-roll inflation the total volume cannot grow by a factor larger than e^(S_dS/2) without becoming infinite. The bound is saturate…
(Small) Resonant non-Gaussianities: Signatures of a Discrete Shift Symmetry in the Effective Field Theory of Inflation
Siavosh R. Behbahani, Anatoly Dymarsky, Mehrdad Mirbabayi +1
We apply the Effective Field Theory of Inflation to study the case where the continuous shift symmetry of the Goldstone boson πis softly broken to a discrete subgroup. This case in…
Horava gravity vs. thermodynamics: the black hole case
D. Blas, S. Sibiryakov
Under broad assumptions breaking of Lorentz invariance in gravitational theories leads to tension with unitarity because it allows for processes that apparently violate the second…