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5 papers · 1 filter
A general Extraplolation Theorem for absolutely summing operators
Daniel Pellegrino, Joedson Santos, Juan B. Seoane-Sepúlveda
In this note we prove a general version of the Extrapolation Theorem, extending the classical linear extrapolation theorem due to B. Maurey. Our result shows, in particular, that t…
Study of the first-order phase transition in the classical and quantum random field Heisenberg model on a simple cubic lattice
Ricardo de Sousa, Douglas F. de Albuquerque, Alberto S. Arruda
The phase diagram of the Heisenberg ferromagnetic model in the presence of a magnetic random field (we have used bimodal distribution) of spin S=1/2 (quantum case) and …
Finding Fossil Groups: Optical Identification and X-ray Confirmation
Eric D. Miller, Eli Rykoff, Renato Dupke +6
We report the discovery of 12 new fossil groups of galaxies, systems dominated by a single giant elliptical galaxy and cluster-scale gravitational potential, but lacking the popula…
Generalizing Planck's distribution by using the Carati-Galgani model of molecular collisions
R. D. B. Carvalho, A. M. C. Souza
Classical systems of coupled harmonic oscillators are studied using the Carati-Galgani model. We investigate the consequences for Einstein's conjecture by considering that the exch…
On the mass-to-light ratios of fossil groups. Are they simply dark clusters?
Robert N. Proctor, Claudia Mendes de Oliveira, Renato Dupke +4
Defined as X-ray bright galaxy groups with large differences between the luminosities of their brightest and second brightest galaxies, "fossil groups" are believed to be some of t…