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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)
Reading disability (RD), or dyslexia, is a common heterogeneous syndrome with a large genetic component. Several studies have consistently found evidence for a quantitative-trait locus (QTL) within the 17 Mb (14.9 cM) that span D6S109 and D6S291 on chromosome 6p21.3-22. To characterize further linkage to the QTL, to define more accurately the location and(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)
BACKGROUND Hepatitis C virus (HCV) is a plus-strand RNA virus that replicates by amplification of genomic RNA from minus strands leading to accumulation of almost one thousand copies per cell under in vitro cell culture conditions. In contrast, HCV RNA copy numbers in livers of infected patients appear to be much lower, estimated at a few copies per cell.(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)
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)
We present an ultraviolet extension of the " simplest little Higgs " model. The model marries the simplest little Higgs at low energies to two copies of the " littlest Higgs " at higher energies. The result is a weakly coupled theory below 100 TeV with a naturally light Higgs. The higher cutoff suppresses the contributions of strongly coupled dynamics to(More)