193 research outputs found
Probing Confinement with Chromomagnetic Fields
Using the lattice Schr\"odinger functional we study vacuum dynamics of SU(3)
gauge theory at finite temperature. The vacuum is probed by means of an
external constant Abelian chromomagnetic field. We find that by increasing the
strength of the applied external field the deconfinement temperature decreases
towards zero. This implies that strong enough Abelian chromomagnetic fields
destroy confinement of color.Comment: Lattice2002(topology). 3 pages, 3 figure
RXJ1856.5-3754 and RXJ0720.4-3125 are P-Stars
P-stars are a new class of compact stars made of up and down quarks in
-equilibrium with electrons in a chromomagnetic condensate. P-stars are
able to account for compact stars with , as well as stars
comparable to canonical neutron stars. We show that P-stars once formed are
absolutely stable, for they cannot decay into neutron or strange stars. We
convincingly argue that the nearest isolated compact stars RXJ1856.5-3754 and
RXJ0720.4-3125 could be interpreted as P-stars with
and .Comment: 18 pages, 2 figures, revised version, to appear in JCA
Magnetars: Structure and evolution from p-star models
P-stars are compact stars made of up and down quarks in -equilibrium
with electrons in a chromomagnetic condensate. We discuss p-stars endowed with
super strong dipolar magnetic field which, following consolidated tradition in
literature, are referred to as magnetars. We show that soft gamma-ray repeaters
and anomalous -ray pulsars can be understood within our theory. We find a
well defined criterion to distinguish rotation powered pulsars from magnetic
powered pulsars. We show that glitches, that in our magnetars are triggered by
magnetic dissipative effects in the inner core, explain both the quiescent
emission and bursts in soft gamma-ray repeaters and anomalous -ray pulsars.
We account for the braking glitch from SGR 1900+14 and the normal glitch from
AXP 1E 2259+586 following a giant burst. We discuss and explain the observed
anti correlation between hardness ratio and intensity. Within our magnetar
theory we are able to account quantitatively for light curves for both
gamma-ray repeaters and anomalous -ray pulsars. In particular we explain the
puzzling light curve after the June 18, 2002 giant burst from AXP 1E 2259+586.Comment: 42 pages, 15 figures, accepted for publication in Astronomy &
Astrophysic
The High Temperature Superconductivity in Cuprates
We discuss the high-temperature superconductivity in copper oxide ceramics.
We propose an effective Hamiltonian to describe the dynamics of electrons or
holes injected into the copper oxide layers. We show that our approach is able
to account for both the pseudogap and the superconductivity gap. For the
hole-doped cuprates we discuss in details the underdoped, optimal doped, and
overdoped regions of the phase diagram. In the underdoped region we determine
the doping dependence of the upper critical magnetic field, the vortex region,
and the discrete states bounded to the core of isolated vortices. We explain
the origin of the Fermi arcs and Fermi pockets. Moreover, we discuss the
recently reported peculiar dependence of the specific heat on the applied
magnetic field. We determine the critical doping where the pseudogap vanishes.
We find that in the overdoped region the superconducting transition is
described by the conventional d-wave BCS theory. We discuss the optimal doping
region and the crossover between the underdoped region and the overdoped
region. We also discuss briefly the electron-doped cuprate superconductors.Comment: 40 pages, 13 figures, revised version accepted for publication in La
Rivista del Nuovo Ciment
Evidence of the true Higgs boson at the LHC Run 2
The aim of the present note is to compare the recent LHC data at with our previous theoretical proposal that the true Higgs boson
should be a broad heavy resonance with mass around . We focus
on the so-called golden channel where the pair of Z bosons
decay leptonically to , being either an
electron or a muon. We use the data collected by the ATLAS and CMS
Collaborations at with an integrated luminosity of and respectively. We find that the experimental
data from both the LHC Collaborations do display in the golden channel a rather
broad resonance structure around with a sizeable statistical
significance. Our theoretical expectations seem to be in fair good agreement
with the experimental observations. Combining the data from both the ATLAS and
CMS Collaborations we obtain an evidence of the heavy Higgs boson in this
channel with an estimated statistical significance of more than five standard
deviations.Comment: Modern Physics Letters A Vol. 33, No. 1 (2019) 1950137 (9 pages) DOI:
10.1142/S0217732319501372. arXiv admin note: substantial text overlap with
arXiv:1707.05605, arXiv:1609.0961
Dynamical Gap Generation in Topological Insulators
We developed a quantum field theoretical description for the surface states
of three-dimensional topological insulators. Within the relativistic quantum
field theory formulation, we investigated the dynamics of low-lying surface
states in an applied transverse magnetic field. We argued that, by taking into
account quantum fluctuations, in three-dimensional topological insulators there
is dynamical generation of a gap by a rearrangement of the Dirac sea. By
comparing with available experimental data we found that our theoretical
results allowed a consistent and coherent description of the Landau level
spectrum of the surface low-lying excitations. Finally, we showed that the
recently detected zero-Hall plateau at the charge neutral point could be
accounted for by chiral edge states residing at the magnetic domain boundaries
between the top and bottom surfaces of the three-dimensional topological
insulator.Comment: 28 pages, 8 figures; revised version accepted for publication in EPJ
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