766 research outputs found
Vacuum Energy, EoS, and the Gluon Condensate at Finite Baryon Density in QCD
The Equation of States (EoS) plays the crucial role in all studies of neutron
star properties. Still, a microscopical understanding of EoS remains largely an
unresolved problem. We use 2-color QCD as a model to study the dependence of
vacuum energy (gluon condensate in QCD) as function of chemical potential
\mu\ll \Lambda_{QCD} where we find very strong and unexpected dependence on
. We present the arguments suggesting that similar behavior may occur in
3-color QCD in the color superconducting phases. Such a study may be of
importance for analysis of EoS when phenomenologically relevant parameters
(within such models as MIT Bag model or NJL model) are fixed at zero density
while the region of study lies at much higher densities not available for
terrestrial tests.Comment: Talk at " Quark Confinement and the Hadron Spectrum VII", Ponta
Delgada, September 2-7, 200
Revealing Randall-Sundrum Hidden Valleys
We study 5D gauge symmetries in the Randall-Sundrum geometry that are hidden
from the standard model through either small 5D gauge coupling, or through
vanishing quantum numbers for the standard model fields. Geometric warping of
5D gravity creates a TeV scale bridge from the standard model to the hidden
sector gauge fields. We apply these concepts to a revival of the electroweak
axion model, in which the dynamics of Peccei-Quinn symmetry breaking occur at
the TeV scale.Comment: 29 pages, 3 figures, 3 table
Intrinsic Strange/Charmed Quarks Inside of a Strangeless/Charmless Hadron
We discuss few, apparently different, but actually tightly related problems:
a)Strangeness in the nucleon; b) B --> eta' decays; c)Intrinsic charm in the
proton spin problem. We argue that all these problems have a common origin and
related to the OZI rule violation in 0^{\pm} vacuum channels . It leads to a
noticeable role of a nonvalence component with 0^{\pm} quantum numbers in a
hadron.}Comment: Talk given at the ``HADRON 97'' BNL, Brookhaven, August 24-28, 1997,
To be published in the proceeding
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