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32 papers · 2 filters
Planckian Birth of the Quantum de Sitter Universe
J. Ambjorn, A. Gorlich, J. Jurkiewicz +1
We show that the quantum universe emerging from a nonperturbative, Lorentzian sum-over-geometries can be described with high accuracy by a four-dimensional de Sitter spacetime. By…
On the renormalization group flow of f(R)-gravity
Pedro F. Machado, Frank Saueressig
We use the functional renormalization group equation for quantum gravity to construct a non-perturbative flow equation for modified gravity theories of the form $S = \int d^dx \sqr…
Dissociation by acceleration
Kasper Peeters, Marija Zamaklar
We show that mesons, described using rotating relativistic strings in a holographic setup, undergo dissociation when their acceleration 'a' exceeds a value which scales with the an…
Recent results in four-dimensional non-perturbative string theory
Frank Saueressig
We review recent progress in understanding non-perturbative instanton corrections to the hypermultiplet moduli space in type II string compactifications on Calabi-Yau threefolds.
Comments on gluon scattering amplitudes via AdS/CFT
Luis F. Alday, Juan Maldacena
In this article we consider n gluon color ordered, planar amplitudes in N=4 super Yang Mills at strong 't Hooft coupling. These amplitudes are approximated by classical surfaces in…
Four-point functions of different-weight operators in the AdS/CFT correspondence
León Berdichevsky, Pieter Naaijkens
We calculate four-point correlation functions of two weight-2 and two weight-3 1/2-BPS operators in \mathcal{N}=4 SYM in the large N limit in supergravity approximation. By the AdS…