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Ultraviolet Behavior of N = 8 supergravity

Description: In these lectures the author describes the remarkable ultraviolet behavior of N = 8 supergravity, which through four loops is no worse than that of N = 4 super-Yang-Mills theory (a finite theory). I also explain the computational tools that allow multi-loop amplitudes to be evaluated in this theory - the KLT relations and the unitarity method - and sketch how ultraviolet divergences are extracted from the amplitudes.
Date: June 7, 2010
Creator: Dixon, Lance J.
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Partner: UNT Libraries Government Documents Department
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Large-N volume independence in conformal and confining gauge theories

Description: Consequences of large N volume independence are examined in conformal and confining gauge theories. In the large N limit, gauge theories compactified on R{sup d-k} x (S{sup 1}){sup k} are independent of the S{sup 1} radii, provided the theory has unbroken center symmetry. In particular, this implies that a large N gauge theory which, on R{sup d}, flows to an IR fixed point, retains the infinite correlation length and other scale invariant properties of the decompactified theory even when compac… more
Date: August 26, 2010
Creator: Unsal, Mithat & Yaffe, Laurence G.
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Partner: UNT Libraries Government Documents Department
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Naturalness from Runaways in Direct Mediation

Description: Postulating that the NMSSM singlet is a meson of a microscopic confining theory opens up new model-building possibilities. Based on this, we construct calculable models of direct mediation that solve the {mu}/B{mu} problem and simultaneously lead to realistic phenomenology. The singlet that couples to the Higgs fields develops a runaway produced by soft interactions, then stabilized by a small superpotential perturbation. The mechanism is first realized in an O'Raifeartaigh model of direct gaug… more
Date: February 7, 2011
Creator: Schafer-Nameki, Sakura; Tamarit, Carlos & Torroba, Gonzalo
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Partner: UNT Libraries Government Documents Department
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Top Quark Amplitudes with an Anomolous Magnetic Moment

Description: The anomalous magnetic moment of the top quark may be measured during the first run of the LHC at 7 TeV. For these measurements, it will be useful to have available tree amplitudes with t{bar t} and arbitrarily many photons and gluons, including both QED and color anomalous magnetic moments. In this paper, we present a method for computing these amplitudes using the Britto-Cachazo-Feng-Witten recursion formula. Because we deal with an effective theory with higher-dimension couplings, there are … more
Date: June 23, 2011
Creator: Larkoski, Andrew J. & Peskin, Michael E.
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Partner: UNT Libraries Government Documents Department
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Unitarity Constraints on Asymmetric Freeze-In

Description: This paper considers unitarity and CPT constraints on asymmetric freeze-in, the use of freeze-in to store baryon number in a dark sector. In this scenario, Sakharov's out of equilibrium condition is satisfied by placing the visible and hidden sectors at different temperatures while a net visible baryon number is produced by storing negative baryon number in a dark sector. It is shown that unitarity and CPT lead to unexpected cancellations. In particular, the transfer of baryon number cancels co… more
Date: August 15, 2011
Creator: Hook, Anson
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Partner: UNT Libraries Government Documents Department
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AdS/QCD, Light-Front Holography, and Sublimated Gluons

Description: The gauge/gravity duality leads to a simple analytical and phenomenologically compelling nonperturbative approximation to the full light-front QCD Hamiltonian - 'Light-Front Holography', which provides a Lorentz-invariant first-approximation to QCD, and successfully describes the spectroscopy of light-quark meson and baryons, their elastic and transition form factors, and other hadronic properties. The bound-state Schroedinger and Dirac equations of the soft-wall AdS/QCD model predict linear Re… more
Date: February 16, 2012
Creator: Brodsky, Stanley J. & de Teramond, Guy F.
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Partner: UNT Libraries Government Documents Department
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On Fayet-Iliopoulos Terms and de Sitter Vacua in Supergravity: Some Easy Pieces

Description: We clarify a number of issues on Fayet-Iliopoulos (FI) terms in supergravity, keeping the formalism at a minimum and making use of explicit examples. We explain why, if the U(1) vector is massive everywhere in field space, FI terms are not genuine and can always be redefined away or introduced when they are not present. We formulate a simple anomaly-free model with a genuine FI term, a classically stable de Sitter (dS) vacuum and no global symmetries. We explore the relation between N = 2 and N… more
Date: March 27, 2012
Creator: Catino, Francesca; Villadoro, Giovanni & Zwirner, Fabio
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Partner: UNT Libraries Government Documents Department
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