5,012 research outputs found
CPT violations in Astrophysics and Cosmology
Full text linkIn this paper it is given a brief review of the current limits on the
magnitude of CPT and Lorentz Invariance violations, currently predicted in
connection with quantum gravity and string/M-theory, that can be derived from
astrophysical and cosmological data. Even if not completely unambiguous, these
observational tests of fundamental physics are complementary to the ones
obtained by accelerator experiments and by ground or space based direct
experiments, because potentially can access very high energies and large
distances.Comment: 13 pages, Invited Paper to the Frascati Workshop 2007 Vulcano
(Italy), May 28 - June 2, 2007-Corrected minor typos and added reference
High energy neutrino astronomy with MACRO
Get PDFA large area underground detector with accurate muon tracking and directionality can be used for the search of extraterrestrial sources of high energy neutrinos. The sensitivity of the MACRO detector to possible sources of neutrinos was evaluated with a Monte-Carlo simulation of the neutrino interaction in the rock and and of the detection in the real apparatus. Two categories of possible neutrino sources are discussed in comparison with the detector sensitivity. Promising candidate objects for this search appear to be the two binary X-ray sources in the southern key Vela X1 and LMC X4, which are known to emit gamma rays up to the 10,000 TeV region
LHC, Astrophysics and Cosmology
Get PDFIn this paper we discuss the impact on cosmology of recent results obtained by the LHC (Large Hadron Collider) experiments in the 2011-2012 runs, respectively at √s = 7 and 8 TeV. The capital achievement of LHC in this period has been the discovery of a spin-0 particle with mass 126 GeV/c2, very similar to the Higgs boson of the Standard Model of Particle Physics. Less exciting, but not less important, negative results of searches for Supersymmetric particles or other exotica in direct production or rare decays are discussed in connection with particles and V.H.E. astronomy searches for Dark Matter
CP VIOLATIONS (AND MORE) AFTER THE FIRST TWO YEARS OF LHCB
Get PDFThe most interesting cosmological open problems, baryon asymmetry, dark matter, inflation and dark energy, are not explained by the standard model of particle physics (SM). The finalgoal of the Large Hadron Collider an experimental verification of the SM in the Higgs sector, and also a search for evidence of new physics beyond it. In this paper we will report some of the results obtained in 2010 and 2011, from the LHCb experiment dedicated to the study of CP violations and rare decays of heavy quarks
Spectral Observations of the 2019 South American Total Solar Eclipse
Get PDFOn July 2, 2019, a total solar eclipse was visible in parts of Chile and Ar-gentina. I joined the Solar Wind Sherpas, an international group of scientists,engineers, students, and eclipse enthusiasts, to South America to make obser-vations of the solar corona (the Sun’s upper atmosphere) during the eclipse.The Sherpas were split into three teams along the path of totality and my groupwas stationed at Mamalluca Observatory in Vicuna, Chile. One of the instru-ments we used at this side was a three-channel (red, green, and blue) spectrom-eter designed by A. Ding, of Hawai’i’s Institute for Astronomy. Spectra from thecorona can be used to study coronal composition and ion speeds. I helped as-semble and align the spectrometer in Chile and performed preliminary analysisof spectral data taken at our site
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