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328 papers · 1 filter
Effective actions at finite temperature
Ashok Das, J. Frenkel
This is a more detailed version of our recent paper where we proposed, from first principles, a direct method for evaluating the exact fermion propagator in the presence of a gener…
Star-forming regions in the intragroup medium of compact groups of galaxies
S. Torres-Flores, C. Mendes de Oliveira, D. F. de Mello +4
We present the results of a multiwavelength campaign searching for young objects in the intragroup medium of seven compact groups of galaxies: HCG 2, 7, 22, 23, 92, 100 and NGC 92.…
Age distribution of the central stars of galactic disk planetary nebulae
W. J. Maciel, R. D. D. Costa, T. E. P. Idiart
The determination of ages of central stars of planetary nebulae (CSPN) is a complex problem, and there is presently no single method that can be generally applied. We have develope…
Normalization procedure for relaxation studies in NMR quantum information processing
A. Gavini-Viana, A. M. Souza, D. O. Soares-Pinto +5
NMR quantum information processing studies rely on the reconstruction of the density matrix representing the so-called pseudo-pure states (PPS). An initially pure part of a PPS sta…
Revisiting the fossil group candidates UGC 842 and NGC 6034
Raimundo Lopes de Oliveira, Eleazar Rodrigo Carrasco, Claudia Mendes de Oliveira +4
We present a new insight on NGC 6034 and UGC 842, two groups of galaxies previously reported in the literature as being fossil groups. The study is based on optical photometry and…
Self-dual Hopfions
L. A. Ferreira, A. C. Riserio do Bonfim
We construct static and time-dependent exact soliton solutions with non-trivial Hopf topological charge for a field theory in 3+1 dimensions with the target space being the two dim…