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Full-Text Articles in Physics
Neutrino Cosmology After Wmap 7-Year Data And Lhc First Z′ Bounds, Luis Alfredo Anchordoqui, Haim Goldberg
Neutrino Cosmology After Wmap 7-Year Data And Lhc First Z′ Bounds, Luis Alfredo Anchordoqui, Haim Goldberg
Haim Goldberg
The gauge-extended U(1)C×SU(2)L×U(1)IR×U(1)L model elevates the global symmetries of the standard model (baryon number B and lepton number L) to local gauge symmetries. The U(1)L symmetry leads to three superweakly interacting right-handed neutrinos. This also renders a B-L symmetry nonanomalous. The superweak interactions of these Dirac states permit νR decoupling just above the QCD phase transition: 175≲TνRdec/MeV≲250. In this transitional region, the residual temperature ratio between νL and νR generates extra relativistic degrees of freedom at BBN and at the CMB epochs. Consistency with both WMAP 7-year data and recent estimates of the primordial 4He mass fraction is achieved for …
Probing Minimal Supergravity Via The Extreme Universe Space Observatory, Luis Anchordoqui, Haim Goldberg, Pran Nath
Probing Minimal Supergravity Via The Extreme Universe Space Observatory, Luis Anchordoqui, Haim Goldberg, Pran Nath
Haim Goldberg
An analysis is carried out within mSUGRA of the estimated number of events originating from upward moving ultrahigh energy neutralinos passing through Earth’s crust that could be detected by the Extreme Universe Space Observatory (EUSO). The analysis exploits a recently proposed technique that differentiates ultrahigh energy neutralinos from ultrahigh energy neutrinos using their different absorption lengths in the Earth’s crust. It is shown that for the part of the parameter space, where the neutralino is mostly a B-ino and with squark mass ∼1TeV, EUSO could see ultrahigh energy neutralino events within mSUGRA models with essentially no background. In the energy …
Scalar Modifications To Gravity From Unparticle Effects May Be Testable, Haim Goldberg, Pran Nath
Scalar Modifications To Gravity From Unparticle Effects May Be Testable, Haim Goldberg, Pran Nath
Haim Goldberg
Interest has focused recently on low energy implications of a nontrivial scale invariant sector of an effective field theory with an IR fixed point, manifest in terms of “unparticles” with peculiar properties. If unparticle stuff exists it could couple to the stress tensor and mediate a new “fifth” force (“ungravity”). Under the assumption of strict conformal invariance in the hidden sector down to low energies, we compute the lowest order ungravity correction to the Newtonian gravitational potential and find scale invariant power law corrections of type (RG/r)2dU⁻1, where dU is an anomalous unparticle dimension and RG is a characteristic length …