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121 papers · 1 filter
The variation of the electromagnetic coupling and quintessence
M. C. Bento, R. Gonzalez Felipe
The properties of quintessence are examined through the study of the variation of the electromagnetic coupling. We consider two simple quintessence models with a modified exponenti…
Noncommutative Quantum Cosmology
C. Bastos, O. Bertolami, N. Dias +1
One presents a phase-space noncommutative extension of Quantum Cosmology in the context of a Kantowski-Sachs (KS) minisuperspace model. We obtain the Wheeler-DeWitt (WDW) equation…
First results on angular distributions of thermal dileptons in nuclear collisions
NA60 Collaboration, R. Arnaldi, K. Banicz +50
The NA60 experiment at the CERN SPS has studied dimuon production in 158A GeV In-In collisions. The strong excess of pairs above the known sources found in the complete mass region…
A geometric approach to Conn's linearization theorem
Marius Crainic, Rui Loja Fernandes
We give a soft geometric proof of the classical result due to Conn stating that a Poisson structure is linearizable around a singular point (zero) at which the isotropy Lie algebra…
Spectroscopy of the unbound: One-neutron knockout reaction of Be
R. Crespo, A. Deltuva, M. Rodríguez-Gallardo +2
Full Faddeev-type calculations are performed for one-neutron knockout reaction of Be on proton target at 69 MeV/u incident energy. Inclusive transverse momentum distribution…
Iterative method to compute the Fermat points and Fermat distances of multiquarks
P. Bicudo, M. Cardoso
The multiquark confining potential is proportional to the total distance of the fundamental strings linking the quarks and antiquarks. We address the computation of the total strin…