279 research outputs found
Inconsistence of super-luminal Cern-Opera neutrino speed with observed SN1987A burst and neutrino mixing for any imaginary neutrino mass
We tried to fit in any way the recent Opera-Cern claims of a neutrino
super-luminal speed with observed Supernova SN1987A neutrino burst and all (or
most) neutrino flavor oscillation. We considered three main frame-works: (1) A
tachyon imaginary neutrino mass, whose timing is nevertheless in conflict with
observed IMB-Kamiokande SN1987A burst by thousands of billion times longer. (2)
An ad hoc anti-tachyon model whose timing shrinkage may accommodate SN1987A
burst but greatly disagree with energy independent Cern-Opera super-luminal
speed. (3) A split neutrino flavor speed (among a common real mass relativistic
neutrino electron component and a super-luminal neutrino {\mu}) in an ad hoc
frozen speed scenario that is leading to the prompt neutrino de-coherence and
the rapid flavor mixing (between electron and muon ones) that are in conflict
with most oscillation records. Therefore we concluded that an error must be
hidden in Opera-Cern time calibration (as indeed recent rumors seem to
confirm). We are also reminding the relevance of the guaranteed minimal
atmospheric neutrino mass whose detection may be achieved by a milliseconds
graviton-neutrino split time delay among gravity burst and neutronization
neutrino peak in any future SN explosion in Andromeda recordable in Megaton
neutrino detector.Comment: 5 pages, 4 figures, corrected and updated atmospheric neutrino
simulatio
An apparent GRBs evolution around us or a sampling of thin GRB beaming jets?
The gamma ray burst apparent average isotropic power versus their red-shift
of all known GRB (Sept.2009) is reported. It calls for an unrealistic Gamma Ray
Burst Evolution around us or it just probe the need of a very thin gamma
precession-jet model. These precessing and spinning jet are originated by
Inverse Compton and-or Synchrotron Radiation at pulsars or micro-quasars
sources, by ultra-relativistic electrons. These Jets are most powerful at
Supernova birth, blazing, once on axis, to us and flashing GRB detector. The
trembling of the thin jet (spinning, precessing, bent by magnetic fields)
explains naturally the observed erratic multi-explosive structure of different
GRBs and its rare re-brightening. The jets are precessing (by binary companion
or inner disk asymmetry) and decaying by power law on time scales to a few
hours. GRB blazing occurs inside the observer cone of view only a seconds
duration times; because relativistic synchrotron (or IC) laws the jet angle is
thinner in gamma but wider in X band. Its apparent brightening is so well
correlated with its hardness (The Amati correlation). This explain the wider
and longer X GRB afterglow duration and the (not so much) rare presence of
X-ray precursors well before the apparent main GRB explosion. The jet lepton
maybe originated by an inner primary hadron core (as well as pions and muons
secondary Jets). The EGRET, AGILE and Fermi few hardest and late GeV gamma
might be PeV neutron beta decay in flight observed in-axis under a relativistic
shrinkage.Comment: 13 pages, 11 figures, Vulcano 200
The XRF080109-SN2008D and a decade of GRB-Jet-SN connection
Last and nearest GRB-XRF 080109 has been an exceptional lesson on GRB nature.
After a decade (since 25 April 08) we know that Supernovae may often contain a
Jet. Its persistent activity may shine on axis as a GRBs. Such a persistent,
thin beamed gamma jet may be powered by either a BH (Black Holes) or Pulsars.
Late stages of these jets may loose the SN traces and appear as a short GRB or
a long orphan GRB (depending on jet angular velocity and view angle). XRF are
peripherical viewing of the jets. These precessing and spinning gamma jet are
originated by Inverse Compton and-or Synchrotron Radiation at pulsars or
micro-quasars sources, by ultra-relativistic electrons. These Jets are most
powerful at Supernova birth, blazing, once on axis, to us and flashing GRB
detector. The trembling of the thin jet explains naturally the observed erratic
multi-explosive structure of different GRBs. The jets are precessing (by binary
companion or inner disk asymmetry) and decaying by power on time scales of few
hours, but they keep staying inside the observer cone view only a few seconds
duration times (GRB); the jet is thinner in gamma and wider in X band. This
explain the wider and longer X GRB afterglow duration and the rare presence of
X-ray precursors.Comment: 11 pages, 12 figure
Why Tau First?
Electron neutrino has been the first neutral lepton to be foreseen and
discovered last century. The un-ordered muon and its neutrino arose later by
cosmic rays. The tau discover, the heaviest, the most unstable charged lepton,
was found surprisingly on 1975. Its neutrino was hardly revealed just on 2000.
So why High Energy Neutrino Astronomy should rise first via tau neutrino, the
last, the most rare one? The reasons are based on a chain of three favorable
coincidences found last decade: the neutrino masses and their flavor mixing,
the UHECR opacity on Cosmic Black Body (GZK cut off on BBR), the amplified tau
air-shower decaying in flight. Indeed guaranteed UHE GZK tau neutrinos, feed by
muon mixing, while skimming the Earth might lead to boosted UHE tau, mostly
horizontal ones. These UHE lepton decay in flight are spread, amplified, noise
free Air-Shower: a huge event for an unique particle. To be observed soon:
within Auger sky, in present decade. Its discover may sign of the first tau
appearance.Comment: 8 pages, 4 figure
Splitting neutrino masses and showering into Sky
Neutrino masses might be as light as a few time the atmospheric neutrino mass
splitting. High Energy ZeV cosmic neutrinos (in Z-Showering model) might hit
relic ones at each mass in different resonance energies in our nearby Universe.
This non-degenerated density and energy must split UHE Z-boson secondaries (in
Z-Burst model) leading to multi injection of UHECR nucleons within future
extreme AUGER energy. Secondaries of Z-Burst as neutral gamma, below a few tens
EeV are better surviving local GZK cut-off and they might explain recent Hires
BL-Lac UHECR correlations at small angles. A different high energy resonance
must lead to Glashow's anti-neutrino showers while hitting electrons in matter.
In air, Glashow's anti-neutrino showers lead to collimated and directional
air-showers offering a new Neutrino Astronomy. At greater energy around PeV,
Tau escaping mountains and Earth and decaying in flight are effectively
showering in air sky. These Horizontal showering is splitting by geomagnetic
field in forked shapes. Such air-showers secondaries release amplified and
beamed gamma bursts (like observed TGF), made also by muon and electron pair
bundles, with their accompanying rich Cherenkov flashes. Also planet' s largest
(Saturn, Jupiter) atmosphere limbs offer an ideal screen for UHE GZK and
Z-burst tau neutrino, because their largest sizes. Titan thick atmosphere and
small radius are optimal for discovering up-going resonant Glashow resonant
showers. Earth detection of Neutrino showering by twin Magic Telescopes on top
mountains, or by balloons and satellites arrays facing the limbs are the
simplest and cheapest way toward UHE Neutrino Astronomy .Comment: 4 pages, 7 figures; an author's name correction and Journal Referenc
Foreseeing Neutrino spectra in Deep Core
Atmospheric muon neutrino in Deep Core (whose rate and spectra might be soon
available) should exhibit a suppression (due to tens GeV up-going muon neutrino
converted into tau flavor) that must be imprinted in out-coming rate spectra.
We estimate here our independent muon neutrino spectra based on SK and its
projected record on Deep Core Channels. Our estimate (based on cosmic rays,
muon records and tested Super-Kamiokande (SK) data) differs both in shape and
in rate from other previous published spectra. The expected rate might exhibit
a minimum near channel 6 of Deep Core strings and it should manifest strong
signature for flavor mixing (mostly between channel 4--15)and a relevant
anomaly for eventual CPT violation (MINOS like) written at channel 3--6,whose
statistical weight (mainly at channel 5) might soon confirm or dismiss MINOS
CPT claim. At the flux minimum around channel 6, (a flux suppressed respect the
non oscillated case at least by an order of magnitude) the atmospheric neutrino
paucity offers a better windows to a twenty GeV Neutrino Astronomy. Therefore
by doubling the string array we may foresee a richer rate and a more complete
(zenith and azimuth) atmospheric neutrino distribution and an exciting first
twenty GeV Astronomy.Comment: 8 pages, 8 figure
Effect of lifestyle changes on erectile dysfunction in obese men: a randomized controlled trial
Context: Healthy lifestyle factors are associated with maintenance of erectile function in men. Objective: To determine the effect of weight loss and increased physical activity on erectile and endothelial functions in obese men. Design, Setting, and Patients: Randomized, single-blind trial of 110 obese men (body mass index ≥30) aged 35 to 55 years, without diabetes, hypertension, or hyperlipidemia, who had erectile dysfunction that was determined by having a score of 21 or less on the International Index of Erectile Function (IIEF). The study was conducted from October 2000 to October 2003 at a university hospital in Italy. Interventions: The 55 men randomly assigned to the intervention group received detailed advice about how to achieve a loss of 10% or more in their total body weight by reducing caloric intake and increasing their level of physical activity. Men in the control group (n=55) were given general information about healthy food choices and exercise. Main Outcomes Measures: Erectile function score, levels of cholesterol and tryglycerides, circulating levels of interleukin 6, interleukin 8, and C-reactive protein, and endothelial function as assessed by vascular responses to L-arginine. Results: After 2 years, body mass index decreased more in the intervention group (from a mean [SD] of 36.9 [2.5] to 31.2 [2.1]) than in the control group (from 36.4 [2.3] to 35.7 [2.5]) (P<.001), as did serum concentrations of interleukin 6 (P=.03), and C-reactive protein (P=.02). The mean (SD) level of physical activity increased more in the intervention group (from 48 [10] to 195 [36] min/wk; P<.001) than in the control group (from 51 [9] to 84 [28] min/wk; P<.001). The mean (SD) IIEF score improved in the intervention group (from 13.9 [4.0] to 17 [5]; P<.001), but remained stable in the control group (from 13.5 [4.0] to 13.6 [4.1]; P=.89). Seventeen men in the intervention group and 3 in the control group (P=.001) reported an IIEF score of 22 or higher. In multivariate analyses, changes in body mass index (P=.02), physical activity (P=.02), and C-reactive protein (P=.03) were independently associated with changes in IIEF score. Conclusion: Lifestyle changes are associated with improvement in sexual function in about one third of obese men with erectile dysfunction at baseline
A comparative approach to understanding tissue-specific expression of uncoupling protein 1 expression in adipose tissue
Peer reviewedPublisher PD
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