Inhomogeneous Structures in Holographic Superfluids: I. Dark Solitons (2009)
Keranen, Ville, Keski-Vakkuri, Esko, Nowling, Sean, Yogendran, K. P.
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-Higgs theory, which was...
Dark Solitons in Holographic Superfluids (2009)
Keranen, Ville, Keski-Vakkuri, Esko, Nowling, Sean, Yogendran, K. P.
We construct dark soliton solutions in a holographic model of a relativistic superfluid. By adjusting the chemical potential, we study the variation of the depletion of charge density at the...
Winding effects on brane/anti-brane pairs (2009)
Jokela, Niko, Jarvinen, Matti, Nowling, Sean
We study a brane/anti-brane configuration which is separated along a compact direction by constructing a tachyon effective action which takes into account transverse scalars. Such an action is...
Topological Entanglement Entropy in Chern-Simons Theories and Quantum Hall Fluids (2008)
Dong, Shiying, Fradkin, Eduardo, Leigh, Robert G., Nowling, Sean
We compute directly the entanglement entropy of spatial regions in Chern-Simons gauge theories in 2+1 dimensions using surgery. We use these results to determine the universal topological piece of...
The Rolling Tachyon Boundary Conformal Field Theory on an Orbifold (2006)
Kawai, Shinsuke, Keski-Vakkuri, Esko, Leigh, Robert G., Nowling, Sean
We consider the non-trivial boundary conformal field theory with exactly marginal boundary deformation. In recent years this deformation has been studied in the context of rolling tachyons and...
Fractional S-branes on a Spacetime Orbifold (2006)
Kawai, Shinsuke, Keski-Vakkuri, Esko, Leigh, Robert G., Nowling, Sean
Unstable D-branes are central objects in string theory, and exist also in time-dependent backgrounds. In this paper we take first steps to studying brane decay in spacetime orbifolds. As a concrete...
Brane Decay from the Origin of Time (2005)
Kawai, Shinsuke, Keski-Vakkuri, Esko, Leigh, Robert G., Nowling, Sean
We present a novel scenario where matter in a spacetime originates from a decaying brane at the origin of time. The decay could be considered as a ``Big Bang''-like event at X^0=0. The closed string...
The Taming of Closed Time-like Curves (2003)
Biswas, Rahul, Keski-Vakkuri, Esko, Leigh, Robert G., Nowling, Sean, Sharpe, Eric
We consider a $R^{1,d}/Z_2$ orbifold, where $Z_2$ acts by time and space reversal, also known as the embedding space of the elliptic de Sitter space. The background has two potentially dangerous...