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20 papers · 2 filters
Renormalization group flows in a Lifshitz-like four fermi model
Avinash Dhar, Gautam Mandal, Partha Nag
We study renormalization group flows in the Lifshitz-like -flavour four fermi model discussed in 0905.2928. In the large- limit, a nontrivial flow occurs in only one of all p…
The Next-to-Simplest Quantum Field Theories
Shailesh Lal, Suvrat Raju
We describe new on-shell recursion relations for tree-amplitudes in N=1 and N=2 gauge theories and use these to show that the structure of the S-matrix in pure N=1 and N=2 gauge th…
Perturbative tests of non-perturbative counting
Atish Dabholkar, Joao Gomes
We observe that a class of quarter-BPS dyons in N=4 theories with charge vector (Q, P) and with nontrivial values of the arithmetic duality invariant I := gcd (Q wedge P) are nonpe…
Holography of Charged Dilaton Black Holes
Kevin Goldstein, Shamit Kachru, Shiroman Prakash +1
We study charged dilaton black branes in . Our system involves a dilaton coupled to a Maxwell field with dilaton-dependent gauge coupling, ${1\over g^2} = f^2(ϕ…
Phases of one dimensional large N gauge theory in a 1/D expansion
Gautam Mandal, Manavendra Mahato, Takeshi Morita
We consider large N Yang Mills theory with D adjoint scalar fields in d dimensions for d=0 or 1. We show the existence of a non-trivial saddle point of the functional integral at l…
Fuzzy Killing Spinors and Supersymmetric D4 action on the Fuzzy 2-sphere from the ABJM Model
Horatiu Nastase, Constantinos Papageorgakis
Our recent construction arXiv:0903.3966 for the fuzzy 2-sphere in terms of bifundamentals, discovered in the context of the ABJM model, is shown to be explicitly equivalent to the…
Emission from the D1D5 CFT: Higher Twists
Steven G. Avery, Borun D. Chowdhury
We study a certain class of nonextremal D1D5 geometries and their ergoregion emission. Using a detailed CFT computation and the formalism developed in arXiv:0906.2015 [hep-th], we…
Aspects of monopole operators in N=6 Chern-Simons theory
Seok Kim, Kallingalthodi Madhu
We study local operators of U(N)xU(N) N=6 Chern-Simons-matter theory including a class of magnetic monopole operators. To take into account the interaction of monopoles and basic f…
Slowly Varying Dilaton Cosmologies and their Field Theory Duals
Adel Awad, Sumit R. Das, Archisman Ghosh +2
We consider a deformation of the solution of IIB supergravity obtained by taking the boundary value of the dilaton to be time dependent. The time dependence is ta…
Emission from the D1D5 CFT
Steven G. Avery, Borun D. Chowdhury, Samir D. Mathur
It is believed that the D1D5 brane system is described by an 'orbifold CFT' at a special point in moduli space. We first develop a general formulation relating amplitudes in a d-di…
Stable Non-Supersymmetric Throats in String Theory
Shamit Kachru, Dusan Simic, Sandip P. Trivedi
We construct a large class of non-supersymmetric AdS-like throat geometries in string theory by taking non-supersymmetric orbifolds of supersymmetric backgrounds. The scale of SUSY…
String spectra near some null cosmological singularities
Kallingalthodi Madhu, K. Narayan
We construct cosmological spacetimes with null Kasner-like singularities as purely gravitational solutions with no other background fields turned on. These can be recast as anisotr…
Asymptotically free four-fermi theory in 4 dimensions at the z=3 Lifshitz-like fixed point
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We show that a Nambu-Jona-Lasinio type four-fermion coupling at the z=3 Lifshitz-like fixed point in 3+1 dimensions is asymptotically free and generates a mass scale dynamically. T…
Weak Field Black Hole Formation in Asymptotically AdS Spacetimes
Sayantani Bhattacharyya, Shiraz Minwalla
We use the AdS/CFT correspondence to study the thermalization of a strongly coupled conformal field theory that is forced out of its vacuum by a source that couples to a marginal o…
The Power of the Higgs Mechanism: Higher-Derivative BLG Theories
Bobby Ezhuthachan, Sunil Mukhi, Constantinos Papageorgakis
We use the novel Higgs mechanism of arXiv:0803.3218 to determine the leading higher-derivative corrections to the Euclidean N = 8 Bagger-Lambert-Gustavsson field theory. The result…
Lumps of plasma in arbitrary dimensions
Jyotirmoy Bhattacharya, Subhaneil Lahiri
We use the AdS/CFT correspondence in a regime in which the field theory reduces to fluid dynamics to construct an infinite class of new black objects in Scherk-Schwarz compactified…
The fuzzy S^2 structure of M2-M5 systems in ABJM membrane theories
Horatiu Nastase, Constantinos Papageorgakis, Sanjaye Ramgoolam
We analyse the fluctuations of the ground-state/funnel solutions proposed to describe M2-M5 systems in the level-k mass-deformed/pure Chern-Simons-matter ABJM theory of multiple me…
No entropy enigmas for N=4 dyons
Atish Dabholkar, Monica Guica, Sameer Murthy +1
We explain why multi-centered black hole configurations where at least one of the centers is a large black hole do not contribute to the indexed degeneracies in theories with N=4 s…
Modification of Gravitational Anomaly Method in Hawking Radiation
Takeshi Morita
We discuss an ambiguity of the derivation of the Hawking radiation through the gravitational anomaly method and propose modifications of this method such that it reproduces the cor…
Intersecting branes and NambuJona-Lasinio model
Avinash Dhar, Partha Nag
We discuss chiral symmetry breaking in the intersecting brane model of Sakai and Sugimoto at weak coupling for a generic value of separation between the flavour and anti-$…