135 research outputs found
A Theory of algebraic integration
In this paper we study the problem of quantizing theories defined over a
nonclassical configuration space. If one follows the path-integral approach,
the first problem one is faced with is the one of definition of the integral
over such spaces. We consider this problem and we show how to define an
integration which respects the physical principle of composition of the
probability amplitudes for a very large class of algebras.Comment: 7 pages, LaTeX (or Latex, etc). Contribution to the Path Integral
from peV to TeV Conference, Florence-Italy, August 25-29, 199
Anisotropic Color Superconductivity
We discuss the possibility that in finite density QCD an anisotropic phase is
realized. This case might arise for quarks with different chemical potential
and/or different masses. In this phase crystalline structures may be formed. We
consider this possibility and we describe, in the context of an effective
lagrangian, the corresponding phonons as the Nambu-Goldstone bosons associated
to the breaking of the space symmetries.Comment: LaTex 17 pages, 6 figures. Contributed paper to the International
Workshop SCGT 02 "Strong Coupling Gauge Theories and Effective Field
Theories", 10-13 December 2002, Nagoya, Japa
On the Ground State of QCD inside a Compact Stellar Object
We describe the effects of the strange quark mass and of the color and
electric neutrality on the superconducing phases of QCD.Comment: Invited talk at the 2006 International Workshop SCGT 06 "Origin of
Mass and Strong Coupling Gauge Theories" 21-24 November 2006, Nagoya, Japan.
Latex file 15 pages. 6 figure
Effective lagrangians for QCD at high density
We describe low energy physics in the CFL and LOFF phases by means of
effective lagrangians. In the CFL case we present also how to derive
expressions for the parameters appearing in the lagrangian via weak coupling
calculations taking advantage of the dimensional reduction of fermion physics
around the Fermi surface. The Goldstone boson of the LOFF phase turns out to be
a phonon satisfying an anisotropic dispersion relation.Comment: LaTex 10 pages. No figures. Invited talk at the Conference
"QCD@work", Martinafranca (Bari), June 16-20, 200
The impact of atomic precision measurements in high energy physics
In this talk I discuss the relevance of atomic physics in understanding some
important questions about elementary particle physics. A particular attention
is devoted to atomic parity violation measurements which seem to suggest new
physics beyond the Standard Model. Atomic physics might also be relevant in
discovering possible violations of the CPT symmetry.Comment: Talk given at the XVII International Conference on Atomic Physics,
ICAP 2000, Florence, June 4-9, 2000. LaTeX, p.16. A sentence and a reference
have been modifie
Non-relativistic Spinning Particle in a Newton-Cartan Background
We construct the action of a non-relativistic spinning particle moving in a
general torsionless Newton-Cartan background. The particle does not follow the
geodesic equations, instead the motion is governed by the non-relativistic
analog of Papapetrou equation. The spinning particle is described in terms of
Grassmann variables. In the flat case the action is invariant under the
non-relativistic analog of space-time vector supersymmetry.Comment: Published versio
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