489 research outputs found
QED vacuum loops and Inflation
A QED-based model of a new version of Vacuum Energy has recently been
suggested, which leads to a simple, finite, one parameter representation of
Dark Energy. An elementary, obvious, but perhaps radical generalization is then
able to describe both Dark Energy and Inflation in the same framework of Vacuum
Energy. One further, obvious generalization then leads to a relation between
Inflation and the Big Bang, to the automatic inclusion of Dark Matter, and to a
possible understanding of the birth (and death) of a Universe.Comment: 10 pages and 1 figure There has been a minor modification in the
previous version (arXiv:1403.2651v1, 03/12/2014) : a reference has been added
in [3] and an Appendix has been adde
The Birth and Death of a Universe
This letter is meant to be a brief survey of several recent publications
providing a simple, sequential explanation of Dark Energy, Inflation and Dark
Matter, which leads to a simple picture of the why and the how of the Big Bang,
and thence to a possible understanding of the birth and death of a Universe.Comment: 4 pages, 1 figur
QED Vacuum Loops and Dark Energy
A QED--based "bootstrap" mechanism is suggested as an explanation for the
vacuum energy that furnished the initial impulse for Inflation, and continues
on to provide present day Dark Energy. Virtual vacuum fluctuations are assumed
to generate effective electromagnetic fields whose average value corresponds to
an effective c--number , which is itself equal to the
vacuum expectation value of the operator in the presence of that
. Lorentz invariance is manifest, as every observer would
measure the same electric field in his or her own reference frame. The model
has one arbitrary parameter , and fits the energy density of present day
Dark Energy for .Comment: 12 pages, 1 figure. arXiv admin note: text overlap with
arXiv:hep-th/0310095, arXiv:hep-th/030310
Analytic, Non-Perturbative, Gauge-invariant QCD: Nucleon Scattering and Binding Potentials
Removal of the quenched approximation in the mechanism which produced an
analytic estimate of quark-binding potentials, along with a reasonable
conjecture of the color structure of the nucleon formed by such a binding
potential, is shown to generate an effective, nucleon scattering and binding
potential. The mass-scale factor on the order of the pion mass, previously
introduced to define transverse imprecision of quark coordinates, is again
used, while the strength of the potential is proportional to the square of a
renormalized QCD coupling constant. The potential so derived does not include
corrections due to spin, angular momentum, nucleon structure, and electroweak
interactions; rather, it is qualitative in nature, showing how Nuclear Physics
can arise from fundamental QCD.Comment: 25 pages, 3 figures in REVTeX. The fifth of a series on
Non-Perturbative QCD (Eur. Phys. J. C65, 395 (2010) or arXiv:0903.2644
[hep-th], arXiv:1003.2936 [hep-th], arXiv:1103.4179 [hep-th] and
arXiv:1104.4663 [hep-th].
Non-abelian Eikonals
A functional formulation and partial solution is given of the non-abelian
eikonal problem associated with the exchange of non-interacting, charged or
colored bosons between a pair of fermions, in the large /small limit. A
simple, functional ``contiguity" prescription is devised for extracting those
terms which exponentiate, and appear to generate the leading, high-energy
behavior of each perturbative order of this simplest non-abelian eikonal
function; the lowest non-trivial order agrees with the corresponding SU(N)
perturbative amplitude, while higher-order contributions to this eikonal
generate an ``effective Reggeization" of the exchanged bosons, resembling
previous results for the perturbative amplitude. One exact and several
approximate examples are given, including an application to self-energy
radiative corrections. In particular, for this class of graphs and to all
orders in the coupling, we calculate the leading-log eikonal for SU(2). Based
on this result, we conjecture the form of the eikonal scattering amplitude for
SU(N).Comment: 19 pages, late
Non trivial generalizations of the Schwinger pair production result II
It is suggested that Schwinger's (1951) vacuum persistence probability
against pair production by an intense but constant electric field is a very
good approximation to the corresponding quantity if the field does not vary
appreciably over distances less than m/e/E/5 pagesComment: 5 page
Chemical-physical and ecological characterisation in the environmental project of a polluted coastal area: the Bagnoli case study
The Bagnoli Bay (southern Tyrrhenian Sea, Naples, Italy) has been impacted for about one century by heavy anthropogenic pollution due to an important steel plant. A multidisciplinary environmental research, aimed at the reclamation of the marine contaminated area, was planned in order to evaluate, through quantitative data, the chemical-physical and ecological characteristics of marine sediments; the latter ones are strictly related to the composition and structure of benthic foraminiferal assemblages. A comprehensive statistical approach, considering all data, was attempted in order to single out the influence of pollutants on the single species distribution. The results show strong heavy metal pollution (Fe, Mn, Pb and Zn) in the vicinity of the industrial plant. Many foraminiferal species (Haynesina germanica, Miliolinella subrotunda,Quinqueloculina parvula), have a good tolerance to some trace metals while, Bulimina sublimbata, Elphidiummacellum and Miliolinella dilatata show a good tolerance to PAHs pollution
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