Arteaga-Velazquez J.C.,University of Morelia
Journal of Physics: Conference Series | Year: 2015
The High Altitude Water Cherenkov (HAWC) observatory is a ground-based air- shower detector designed to study cosmic rays and gamma rays with energies from 100 GeV up to 100 TeV. HAWC simultaneously surveys 2sr of the northern sky with a high duty cycle > 90% in search for photons from point and extended sources, diffuse emission, transient events and other astrophysical phenomena at multi-TeV scales against the background of cosmic rays. In fact, the study of this background will open also the possibility of doing cosmic ray physics in the GeV - TeV regime and even to perform solar studies at HAWC. The observatory will consist of a densely packed array of 300 water Cherenkov tanks (4.5 m tall and 7.3 m diameter with 4 photomultipliers each) distributed on a 22 000 m2 surface. Deployment started in March 2012 on a plateau situated on the Sierra Negra Volcano in the state of Puebla, Mexico, at an altitude of 4100 m. Construction is expected to be finished by the first months of 2015. In the mean time, HAWC has been taking data with a partial array and preliminary results have been already obtained. In this contribution, the results from the latest HAWC observations will be presented. © Published under licence by IOP Publishing Ltd.
Campos R.G.,University of Morelia
European Physical Journal Plus | Year: 2015
A Cauchy-type integral formula is used to obtain the value of a fractional derivative of a power function at the negative real axis. This new result highlights the lack of time-reversal symmetry of a fractional differential operator of noninteger order in Newtonian mechanics. © 2015, Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg.
Das A.K.,University of Rochester |
Das A.K.,Saha Institute of Nuclear Physics |
Frenkel J.,University of Sao Paulo |
Schubert C.,University of Morelia
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2013
We study the behavior of the dynamical fermion mass when infrared divergences and mass shell singularities are present in a gauge theory. In particular, in the massive Schwinger model in covariant gauges we find that the pole of the fermion propagator is divergent and gauge dependent at one loop, but the leading singularities cancel in the quenched rainbow approximation. On the other hand, in physical gauges, we find that the dynamical fermion mass is finite and gauge independent at least up to one loop. © 2013 Elsevier B.V.
Do internet, social network and other educational tools influence in the development of nervous anorexia and bulimia? [¿influyen el Internet, las redes sociales electrónicas y otras herramientas educativas en el desarrollo de anorexia y bulimia nervosas?]
Samano Orozco L.F.,University of Morelia
Nutricion Clinica y Dietetica Hospitalaria | Year: 2013
In recent years eating disorders have increased their presence in Mexico. It has been suggested that internet and social network which promote restrictive behavior influence and may be responsible for this increment. Nowadays, internet plays a fundamental roll in the teaching-learning process and a very important tool in informal education, however, the use of internet and social network haven't been significantly related to the development of those eating disorders. On the other hand, one of the most accepted models about influential factors of the mentioned disorders leaves out the possibility that constant contact with these technology tools favors the development of anorexia and bulimia and other unspecified problems if we do not have the presence of other important factors.
Wagner E.,University of Morelia
Journal of Physics: Conference Series | Year: 2016
Hilbert space representations of quantum SU(2) by multiplication operators on a local chart are constructed, where the local chart is given by tensor products of square integrable functions on a quantum disc and on the classical unit circle. The actions of generators of quantum SU(2), generators of the opposite algebra, and noncommutative partial derivatives are computed on a Hilbert space basis. © Published under licence by IOP Publishing Ltd.