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11 papers · 2 filters
Cyclic Inflation
Tirthabir Biswas, Stephon Alexander
We present an inflationary model that is geodesically complete and does not suffer from the transplanckian problem. In most inflationary models, massless (conformal) scalar field f…
Quantum spinning strings in AdS_4 x CP^3: testing the Bethe Ansatz proposal
Tristan McLoughlin, Radu Roiban, Arkady A. Tseytlin
Recently, an asymptotic Bethe Ansatz that is claimed to describe anomalous dimensions of "long" operators in the planar N=6 supersymmetric three-dimensional Chern-Simons-matter the…
Stable de Sitter Vacua in 4 Dimensional Supergravity Originating from 5 Dimensions
O. Ogetbil
The five dimensional stable de Sitter ground states in N=2 supergravity obtained by gauging SO(1,1) symmetry of the real symmetric scalar manifold (in particular a generic Jordan f…
Manifest Ultraviolet Behavior for the Three-Loop Four-Point Amplitude of N=8 Supergravity
Z. Bern, J. J. M. Carrasco, L. J. Dixon +2
Using the method of maximal cuts, we obtain a form of the three-loop four-point scattering amplitude of N=8 supergravity in which all ultraviolet cancellations are made manifest. T…
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
Luis F. Alday, Radu Roiban
We review, in a self-contained and pedagogical manner, recent developments and techniques for the evaluation of the scattering amplitudes of planar N=4 SYM theory at both weak and…
The cosmological BCS mechanism and the Big Bang Singularity
Stephon Alexander, Tirthabir Biswas
We provide a novel mechanism that resolves the Big Bang Singularity present in FRW space-times without the need for ghost fields. Building on the fact that a four-fermion interacti…