1,358 research outputs found
Towards unravelling the structural distribution of ultra-high-energy cosmic ray sources
We investigate the possibility that near future observations of
ultra-high-energy cosmic rays (UHECRs) can unveil their local source
distribution, which reflects the observed local structures if their origins are
astrophysical objects. In order to discuss this possibility, we calculate the
arrival distribution of UHE protons taking into account their propagation
process in intergalactic space i.e. energy losses and deflections by
extragalactic magnetic field (EGMF). For a realistic simulation, we construct
and adopt a model of a structured EGMF and UHECR source distribution, which
reproduce the local structures actually observed around the Milky Way. The
arrival distribution is compared statistically to their source distribution
using correlation coefficient. We specially find that UHECRs above
eV are best indicators to decipher their source distribution within
100 Mpc, and detection of about 500 events on all the sky allows us to unveil
the local structure of UHE universe for plausible EGMF strength and the source
number density. This number of events can be detected by five years observation
by Pierre Auger Observatory.Comment: 7pages, 4 figures, submitted to Ap
A "Gauged" Peccei-Quinn Symmetry
The Peccei-Quinn (PQ) solution to the strong problem requires an
anomalous global symmetry, the PQ symmetry. The origin of such a
convenient global symmetry is quite puzzling from the theoretical point of view
in many aspects. In this paper, we propose a simple prescription which provides
an origin of the PQ symmetry. There, the global PQ symmetry is virtually
embedded in a gauged PQ symmetry. Due to its simplicity, this mechanism
can be implemented in many conventional models with the PQ symmetry.Comment: 5 pages, 1 figure
Diboson Resonance as a Portal to Hidden Strong Dynamics
We propose a new explanation for excess events observed in the search for a
high-mass resonance decaying into dibosons by the ATLAS experiment. The
resonance is identified as a composite spin- particle that couples to the
Standard Model gauge bosons via dimension-5 operators. The excess events can be
explained if the dimension-5 operators are suppressed by a mass scale of -) TeV. We also construct a model of hidden strong gauge dynamics
which realizes the spin- particle as its lightest composite state, with
appropriate couplings to Standard Model gauge bosons.Comment: 21 pages, 4 figure
Persistent increase in the amount of aquaporin-5 in the apical plasma membrane of rat parotid acinar cells induced by a muscarinic agonist SNI-2011
AbstractSNI-2011 induces the long-lasting increase in the amount of aquaporin-5 (AQP5) in apical plasma membranes (APMs) of rat parotid acini in a concentration-dependent manner. This induction was inhibited by p-F-HHSiD, U73122, TMB-8, or dantrolene but not by bisindolmaleimide or H-7, indicating that SNI-2011 acting at M3 muscarinic receptors induced translocation of AQP5 via [Ca2+]i elevation but not via the activation of protein kinase C. In contrast, acetylcholine induced a transient translocation of AQP5 to APMs. SNI-2011 induces long-lasting oscillations of [Ca2+]i in the presence of extracellular Ca2+. Thus, SNI-2011 induces a long-lasting translocation of AQP5 to APMs coupled with persistent [Ca2+]i oscillations
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