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51 papers · 1 filter
The Polyakov loop and the heat kernel expansion at finite temperature
E. Megias, E. Ruiz Arriola, L. L. Salcedo
The lower order terms of the heat kernel expansion at coincident points are computed in the context of finite temperature quantum field theory for flat space-time and in the presen…
Determination of m_s and |V_us| from hadronic tau decays
E. Gamiz, M. Jamin, A. Pich +2
The mass of the strange quark is determined from SU(3)-breaking effects in the tau hadronic width. Compared to previous analyses, the contributions from scalar and pseudoscalar spe…
Lobe Advance Velocities in the Extragalactic Compact Symmetric Object 4C 31.04
M. Giroletti, G. Giovannini, G. B. Taylor +3
We report on the results of a two epoch study of the low power Compact Symmetric Object 4C 31.04. Observations performed with the VLBA at 5 GHz in 1995 and 2000 have yielded images…
Leibnizian, Galilean and Newtonian structures of spacetime
Antonio N. Bernal, Miguel Sánchez
The following three geometrical structures on a manifold are studied in detail: (1) Leibnizian: a non-vanishing 1-form plus a Riemannian metric $\h$ on its annhilator vector bu…
A catalog of warps in spiral and lenticular galaxies in the Southern hemisphere
M. L. Sanchez-Saavedra, E. Battaner, A. Guijarro +2
A catalog of optical warps of galaxies is presented. This can be considered complementary to that reported by Sanchez-Saavedra et al., with 42 galaxies in the northern hemisphere,…
A New 5-Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon
F. Cornet, P. Jankowski, M. Krawczyk +1
New, radiatively generated, LO quark (u,d,s,c,b) and gluon densities in a real, unpolarized photon are presented. We perform a global 3-parameter fit, based on LO DGLAP evolution e…