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- P. Avelino2 profiles18 · h 34
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- Centro de Astrofísica da Universidade do PortoPT76 papers
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29 papers · 1 filter
Phase-space noncommutative extension of the Robertson-Schroedinger formulation of Ozawa's uncertainty principle
Catarina Bastos, Alex E. Bernardini, Orfeu Bertolami +2
We revisit Ozawa's uncertainty principle (OUP) in the framework of noncommutative (NC) quantum mechanics. We derive a matrix version of OUP accommodating any NC structure in the ph…
Decay constants of the pion and its excitations in holographic QCD
Alfonso Ballon-Bayona, Gastao Krein, Carlisson Miller
We investigate the leptonic decay constants of the pion and its excitations with a 5-d holographic model for quantum chromodynamics. We prove numerically that the leptonic decay co…
Li abundances in F stars: planets, rotation and galactic evolution
E. Delgado Mena, S. Bertrán de Lis, V. Zh. Adibekyan +7
We find that hot jupiter host stars within the T range 5900-6300K show lower Li abundances, by 0.14 dex, than stars without detected planets. This offset has a signi…
The Gaia-ESO Survey: Chromospheric Emission, Accretion Properties, and Rotation in Velorum and Chamaeleon I
A. Frasca, K. Biazzo, A. C. Lanzafame +33
We use the fundamental parameters delivered by the GES consortium in the first internal data release to select the members of Vel and Cha I among the UVES and GIRAFFE spectrosc…
Howson's property for semidirect products of semilattices by groups
Pedro V. Silva, Filipa Soares
An inverse semigroup is a Howson inverse semigroup if the intersection of finitely generated inverse subsemigroups of is finitely generated. Given a locally finite action $…
BGLS: A Bayesian formalism for the generalised Lomb-Scargle periodogram
A. Mortier, J. P. Faria, C. M. Correia +2
Context. Frequency analyses are very important in astronomy today, not least in the ever-growing field of exoplanets, where short-period signals in stellar radial velocity data are…