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13 papers · 2 filters
Inhomogeneous Structures in Holographic Superfluids: I. Dark Solitons
Ville Keranen, Esko Keski-Vakkuri, Sean Nowling +1
We begin an investigation of inhomogeneous structures in holographic superfluids. As a first example, we study domain wall like defects in the 3+1 dimensional Einstein-Maxwell-Higg…
Electrostatics approach to closed string pair production from a decaying D-brane
Niko Jokela, Matti Jarvinen, Esko Keski-Vakkuri
We consider the emission of two closed string tachyons from a decaying Dp-brane in bosonic string theory. We study the high energy limit of the emission amplitude by using an analo…
On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll
Diana Battefeld, Thorsten Battefeld
We compute analytic expressions for the non-linearity parameters characterizing the bi- and tri-spectrum of primordial curvature perturbations generated during an inflationary epoc…
Can Seiberg-Witten Map Bypass Noncommutative Gauge Theory No-Go Theorem?
M. Chaichian, P. Presnajder, M. M. Sheikh-Jabbari +1
There are strong restrictions on the possible representations and in general on the matter content of gauge theories formulated on noncommutative Moyal spaces, termed as noncommuta…
Dark Solitons in Holographic Superfluids
Ville Keranen, Esko Keski-Vakkuri, Sean Nowling +1
We construct dark soliton solutions in a holographic model of a relativistic superfluid. We study the length scales associated with the condensate and the charge density depletion,…
Gauge field theories with covariant star-product
M. Chaichian, A. Tureanu, G. Zet
A noncommutative gauge theory is developed using a covariant star-product between differential forms defined on a symplectic manifold, considered as the space-time. It is proven th…