David Elazzar Kaplan

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We present a model of electroweak symmetry breaking in which the Higgs boson is a pseudo-Nambu-Goldstone boson. By embedding the standard models SU (2) × U (1) into an SU (4) × U (1) gauge group, one-loop quadratic divergences to the Higgs mass from gauge and top loops are canceled automatically with the minimal particle content. The potential contains a(More)
We propose a new framework for mediating supersymmetry breaking through an extra dimension. It predicts positive scalar masses and solves the supersymmetric flavor problem. Supersymmetry breaks on a " source " brane that is spatially separated from a parallel brane on which the standard model matter fields and their superpartners live. The gauge and gaugino(More)
We study a symmetry, schematically Energy → – Energy, which suppresses matter contributions to the cosmological constant. The requisite negative energy fluctuations are identified with a " ghost " copy of the Standard Model. Gravity explicitly, but weakly, violates the symmetry, and naturalness requires General Relativity to break down at short distances(More)
It is known that one can add D-term contributions for U (1) Y and U (1) B−L to the anomaly-mediated supersymmetry breaking to make the superparticle spectrum phenomenologically viable. We point out that this can be done without spoiling its important virtue, namely the ultraviolet insensitivity. This framework can be derived from su-persymmetry breaking and(More)
The minimal supersymmetric standard model, and extensions, have stringent upper bounds on the mass of the lightest Higgs boson if perturbativity up to the Planck scale is assumed. We argue that these bounds are softened tremendously if the Higgs is charged under an asymptotically free gauge group. We present a model with an additional SU (2) gauge group(More)
Little Higgs theories are an exciting new possibility for physics at TeV energies. In the Standard Model the Higgs mass suffers from an instability under radiative corrections. This " hierarchy problem " motivates much of current physics beyond the Standard Model research. Little Higgs theories offer a new and very promising solution to this problem in(More)
The measured values of two electroweak gauge couplings appear to obey an approximate (5%) SU (3) relation. Unless this is an accident caused by fortuitous Planck-scale physics, it suggests the presence of an SU (3) symmetry near the electroweak scale. We propose this to be a local SU (3) which spontaneously " mixes " with SU (2) × U (1) near a TeV. Although(More)
We present a supersymmetric model of flavor. A single U(1) gauge group is responsible for both generating the flavor spectrum and communicating supersym-metry breaking to the visible sector. The problem of Flavor Changing Neutral Currents is overcome, in part using an 'Effective Supersymmetry' spectrum among the squarks, with the first two generations very(More)
We consider a simple class of models in which the relic density of dark matter is determined by the baryon asymmetry of the universe. In these models a B −L asymmetry generated at high temperatures is transfered to the dark matter, which is charged under B − L. The interactions that transfer the asymmetry decouple at temperatures above the dark matter mass,(More)