3,583 research outputs found
Low-scale inflation in a model of dark energy and dark matter
We present a complete particle physics model that explains three major
problems of modern cosmology: inflation, dark matter and dark energy, and also
gives a mechanism for leptogenesis. The model has a new gauge group
that grows strong at a scale eV. We focus on the
inflationary aspects of the model. Inflation occurs with a Coleman-Weinberg
potential at a low scale, down to \sim 6\times 10^5\gev, being compatible
with observational data.Comment: 5 two-column pages, RevTex4; two reference added and minor changes
made in the text; published in JCA
A phenomenological Theory of Fermion Masses and Mixings
A phenomenological theory of fermion masses and mixings is constructed within
the framework of a four- family symmetry. It is found that the most favored set
of relevant CKM elements are , ,
, , , with . The top quark
mass is predicted to be 258 GeV at 1 GeV with its physical mass approximately
equal to 153 GeV. The Majorana scale associated with the fourth neutrino is
bound from above to be 6.4 TeV.Comment: 13 pages RevTeX, INPP-UVA-94-
Teeny, tiny Dirac neutrino masses: an unorthodox point of view
There are now strong hints suggesting that neutrinos do have a mass after
all. If they do have a mass, it would have to be tiny. Why is it so? Is it
Dirac or Majorana? Can one build a model in which a teeny, tiny Dirac neutrino
mass arises in a natural way? Can one learn something else other than just
neutrino masses? What are the extra phenomenological consequences of such a
model? These are the questions that I will try to focus on in this talk.Comment: 11 pages, 2 figures, LateX, aipproc style. Talk presented at the
Second Tropical Workshop on Particle Physics and Cosmology, Neutrino and
Flavor Physics, 1-6 May 2000, San Juan, Puerto Ric
The Lifetime Frontier: Search for New Physics with Long-Lived Particles
The search for new physics with long-lived particles is an ongoing and
thriving effort in the High Energy Physics community which necessitates new
search strategies such as novel algorithms, novel detectors, etc...For these
reasons, one could perhaps add another frontier, the Lifetime Frontier, to the
standard three (Energy, Intensity and Cosmic). In this talk, I will describe a
BSM physics model whose characteristic signatures are decays of new (mirror)
fermions at displaced vertices, a domain belonging to the Lifetime Frontier. It
is a model of {\em non-sterile} right-handed neutrinos whose masses are
proportional to the electroweak scale . The model
proposed a solution to the strong CP problem with a surprising connection
between the sizes of the neutrino masses and the -angle which
contributes to the neutron electric dipole moment.Comment: 6 pages, 3 figures, contribution to the 2019 EW/QCD/Gravitation
session of the 54th Rencontres de Morion
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