330 citations · 3.6k across the 68 of their papers we have counts for
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hep-th2006★ 46 cited
Causality Constrains Higher Curvature Corrections to Gravity
A. Gruzinov, M. Kleban
We show that causality constrains the sign of quartic Riemann corrections to the Einstein-Hilbert action. Our constraint constitutes a restriction on candidate theories of quantum…
hep-th2006★ 50 cited
Transitions Between de Sitter Minima
Puneet Batra, Matthew Kleban
We investigate the cosmological signatures of instantons mediating tunneling between de Sitter minima. For generic potentials the Coleman-de Luccia instanton does not necessarily e…
astro-ph2006★ 40 cited
Gravitational Backreaction of Matter Inhomogeneities
A. Gruzinov, M. Kleban, M. Porrati +1
The non-linearity of Einstein's equations makes it possible for small-scale matter inhomogeneities to affect the Universe at cosmological distances. We study the size of such effec…