9,642 research outputs found
The Proton Mass and Scale-Invariant Hidden Local Symmetry for Compressed Baryonic Matter
I discuss how to access dense baryonic matter of compact stars by combining
hidden local symmetry (HLS) of light-quark vector mesons with spontaneously
broken scale invariance of a (pseudo) Nambu-Goldstone boson, dilaton, in a
description that parallels the approach to dilatonic Higgs. Some of the
surprising observations are that the bulk of proton mass is not
Nambu-Goldstonian, parity doubling emerges at high density and the EoS of
baryonic matter can be soft enough for heavy-ion processes at low density and
stiff enough at high density for solar mass neutron stars.Comment: Talk given at the Sakata Memorial Workshop on "Origin of Mass and
Strong-Coupling Gauge Theories" 3-6 March 2015, Nagoya Universit
In Search of a Pristine Signal for (Scale-)Chiral Symmetry in Nuclei
I describe the long-standing search for a "smoking-gun" signal for the
manifestation of (scale-)chiral symmetry in nuclear interactions. It is
prompted by Gerry Brown's last unpublished note, reproduced verbatim below, on
the preeminent role of pions and vector (,) mesons in providing a
simple and elegant description of strongly correlated nuclear interactions. In
this note written in tribute to Gerry Brown, I first describe a case of an
unambiguous signal in axial-charge transitions in nuclei and then combine his
ideas with the more recent development on the role of hidden symmetries in
nuclear physics. What transpires is the surprising conclusion that the
Landau-Migdal fixed point interaction , the nuclear tensor forces
and Brown-Rho scaling, all encoded in scale-invariant hidden local symmetry, as
Gerry put, "run the show and make all forces equal."Comment: To appear in G.E. Brown Memorial Volum
The Vector Manifestation and Effective Degrees of Freedom At Chiral Restoration
The role of effective degrees of freedom on the vector and axial-vector
susceptibilities and the pion velocity at chiral restoration is analyzed. We
consider two possible scenarios, one in which pions are considered to be the
only low-lying degrees of freedom -- that we shall refer to as "standard" --
and the other in which pions, vector mesons and constituent quarks (or
quasiquarks in short) are the relevant low-lying degrees of freedom -- that we
shall refer to as "vector manifestation (VM)." We show at one-loop order in
chiral perturbation theory with hidden local symmetry Lagrangian that while in
the standard scenario, the pion velocity vanishes at the chiral transition, it
instead approaches unity in the VM scenario. If the VM is realized in nature,
the chiral phase structure of hadronic matter can be much richer than that in
the standard one and the phase transition will be a smooth crossover: Sharp
vector and scalar excitations are expected in the vicinity of the critical
point. Some indirect indications that lend support to the VM scenario, and in
consequence to BR scaling, are discussed.Comment: Based on talks given at "Chiral 02," Kyoto, Japan, 7-9 October 2002
and "SCGT02," Nagoya, Japan, 10-13 December 200
Physics of Dense and Superdense Matter
I discuss a few aspects of dense hadronic matter and superdense QCD matter
that are considered to be relevant to the physics of compact astrophysical
systems. The connection between a "bottom-up approach" and a "top-down
approach" is made with the help of an effective field theory strategy. Topics
treated are meson condensation going up from low density and color
superconductivity going down from asymptotic density with the approach to the
chiral phase transition made in terms of Brown-Rho scaling.Comment: Latex 11 pages, 2 eps figures, typos correcte
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