142 research outputs found
Geometric invariants as detector of Hawking and Unruh effects and quantum field theory in curved space
We report on the recent results revealing the presence of geometric
invariants in all the phenomena in which vacuum condensates appear and we show
that Aharonov--Anandan phase can be used to provide the evidence of phenomena
like Hawking and Unruh effects and to test some behavior of quantum field
theory in curved space. A very precise quantum thermometer can be also built by
using geometric invariants.Comment: 7 pags. arXiv admin note: substantial text overlap with
arXiv:1311.289
Spontaneous supersymmetry breaking probed by geometric invariants
The presence of the Aharonov-Anandan invariant in phenomena in which vacuum
condensates are physically relevant can help to reveal the spontaneous
supersymmetry breaking induced by condensates. The analysis is presented in the
case of the Wess--Zumino model. The manifestation of the Aharonov-Anandan
invariant of atoms and their superpartners, generated at non-zero temperature,
could reveal the signature of SUSY violation in a recently proposed
experimental setup based on an optical lattice in which SUSY is broken at
non-zero temperature.Comment: 5 page
Probing Hawking and Unruh effects and quantum field theory in curved space by geometric invariants
The presence of noncyclic geometric invariant is revealed in all the
phenomena where particle generation from vacuum or vacuum condensates appear.
Aharonov--Anandan invariants then can help to study such systems and can
represent a new tool to be used in order to provide laboratory evidence of
phenomena particulary hard to be detected, such as Hawking and Unruh effects
and some features of quantum field theory in curved space simulated by some
graphene morphologies. It is finally suggested that a very precise quantum
thermometer can be built by exploiting geometric invariants properties.Comment: 9 page
Vacuum condensates as a mechanism of spontaneous supersymmetry breaking
A possible mechanism for the spontaneous breaking of SUSY, based on the
presence of vacuum condensates, is reviewed. Such a mechanism could occur in
many physical examples, both at the fundamental and emergent level, and would
be formally analogous to spontaneous SUSY breaking at finite temperature in the
TFD formalism, in which case it can be applied as well. A possible experimental
setup for detecting such a breaking through measurement of the Anandan-Aharonov
invariants associated with vacuum condensates in an optical lattice model is
proposed.Comment: 6 pages, 2 figures, review article to appear in the special issue
"Supersymmetry, Supergravity, and Superstring Phenomenology" of Advances in
High Energy Physic
Vacuum condensates, flavor mixing and spontaneous supersymmetry breaking
Spontaneous supersymmetry (SUSY) breaking is revealed in all phenomena in
which vacuum condensates are physically relevant. The dynamical breakdown of
SUSY is generated by the condensates themselves, which lift the zero point
energy. Evidence is presented in the case of the Wess-Zuimino model, and the
flavor mixing case is treated in detail.Comment: 5 page
Spontaneous Supersymmetry Breaking Induced by Vacuum Condensates
We propose a novel mechanism of spontaneous supersymmetry breaking which
relies upon an ubiquitous feature of Quantum Field Theory, vacuum condensates.
Such condensates play a crucial r\^{o}le in many phenomena. Examples include
Unruh effect, superconductors, particle mixing, and quantum dissipative
systems. We argue that in all these phenomena supersymmetry, when present, is
spontaneously broken. Evidence for our conjecture is given for the Wess--Zumino
model, that can be considered an approximation to the supersymmetric extensions
of the above mentioned systems. The magnitude of the effect is estimated for a
recently proposed experimental setup based on an optical lattice.Comment: 5 page
Thermal condensate structure and cosmological energy density of the Universe
The aim of this paper is the study of thermal vacuum condensate for scalar
and fermion fields. We analyze the thermal states at the temperature of the
cosmic microwave background (CMB) and we show that the vacuum expectation value
of the energy momentum tensor density of photon fields reproduces the energy
density and pressure of the CMB. We perform the computations in the formal
framework of the thermo field dynamics. We also consider the case of neutrinos
and thermal states at the temperature of the neutrino cosmic background.
Consistency with the estimated lower bound of the sum of the active neutrino
masses is verified. In the boson sector, non trivial contribution to the energy
of the universe is given by particles of masses of the order of
compatible with the ones of the axion-like particles. The fractal self-similar
structure of the thermal radiation is also discussed and related to the
coherent structure of the thermal vacuum.Comment: 5 page
Theory of warm ionized gases: equation of state and kinetic Schottky anomaly
Based on accurate Lennard-Jones type interaction potentials, we derive a
closed set of state equations for the description of warm atomic gases in the
presence of ionization processes. The specific heat is predicted to exhibit
peaks in correspondence to single and multiple ionizations. Such kinetic
analogue in atomic gases of the Schottky anomaly in solids is enhanced at
intermediate and low atomic densities. The case of adiabatic compression of
noble gases is analyzed in detail and the implications on sonoluminescence are
discussed. In particular, the predicted plasma electron density in a
sonoluminescent bubble turns out to be in good agreement with the value
measured in recent experiments.Comment: 7 pages, 4 figures, replaced with published versio
Mixing-induced Spontaneous Supersymmetry Breaking
It is conjectured that flavor mixing furnishes a universal mechanism for the
spontaneous breaking of supersymmetry. The conjecture is proved explicitly for
the mixing of two Wess--Zumino supermultiplets and arguments
for its general validity are given. The mechanism relies on the fact that,
despite mixing treats fermions and bosons symmetrically, both the fermionic and
the bosonic zero point energies are shifted by a positive amount and this kind
of shift does not respect supersymmetry.Comment: 5 pages, 1 figure, Eq(12) of V1 corrected to Eq(22), explicit
off-shell formulation included, one reference adde
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