357 research outputs found
On the implications of a dilaton in gauge theory
Some recent work on the implications of a dilaton in 4d gauge theories are
revisited. In part I of this paper we see how an effective dilaton coupling to
gauge kinetic term provides a simple attractive mechanism to generate
confinement. In particular, we put emphasis on the derivation of confining
analytical solutions and look into the problem how dilaton degrees of freedom
modify Coulom potential and when a confining phase occurs. In part II, we solve
the semi-relativistic wave equation, for Dick interquark potential using the
Shifted l-expansion technique (SLET) in the heavy quarkonium sector. The
results of this phenomenological analysis proves that these effective theories
can be relevant to model quark confinement and may shed some light on
confinement mechanism.Comment: 8 pages. Talk given at CTP Symposium on Supersymmetry at LHC:
Theoretical and Experimental Prospectives, Cairo, Egypt, 11-14 Mar 200
Phase transitions and geothermodynamics of black holes in dRGT massive gravity
In this paper, we study the thermodynamics and geothermodynamics of spherical
black hole solutions in dRGT massive gravity in a new extended phase space.
Inspired by the work of Kastor et al. [1], by interpreting the graviton mass as
a thermodynamical variable, we propose a first law of thermodynamics which
include a mass term and establish a new Smarr Formula. Then, we perform a
thermodynamical analysis to reveal the existence of a critical behavior for
black holes in dRGT massive gravity with two different critical points through
canonical and grand canonical ensembles. To consolidate these results, we make
use of the thermodynamical geometry formalism, with the HPEM and the Gibbs free
energy metrics, to derive the singularities of Ricci scalar curvatures and show
that they coincide with those of the capacities. The effect of different values
of the spacetime parameters on the stability conditions is also discussed.Comment: 22 pages, Latex file, 10 figures, accepted in EPJ
Probing DDM and ML quantum concepts in shape phase transitions of -unstable nuclei
In a recent paper (S. Ait El Korchi et al. 2020 EPL 132 52001), we explored,
inside the context of Critical Point Symmetries (CPSs) X(3) and Z(4), a
correlation between two exceedingly known quantum concepts, the Minimal Length
(ML) and the Deformation-Dependent Mass (DDM), that are commonly applied in
various areas of physics. Such a correlation has been strongly identified in
transition nuclei by calculating some physical observables of that quantum
system, like as energy spectra, moments of inertia and transition
probabilities. In this paper we extend that study to E(5) dynamical symmetry
corresponding to the shape phase transition U(5)O(6). The
experimental realization of the models was found to occur in some nuclei, using
the existing phenomenological potentials : Infinite Square Well, Davidson and
Kratzer, whose models fits provide the best agreement. Importantly the
calculations performed in this work using these potentials corroborate the fact
that the revealed correlation between both quantum concepts is not
destructively affected by the presence of other model parameters and hence its
existence is independent of the form or type of the used potential.
Undoubtedly, the present work will open the way for more investigations of this
correlation in the limits of other critical points symmetries in nuclear shape
phase transitions which play today a major role in nuclear structure research
from theoretical as well as experimental point of view.Comment: 31 pages, 3 figures, accepted in Nuclear Physics
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