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43 papers · 1 filter
Scalar perturbations of higher dimensional rotating and ultra-spinning black holes
Vitor Cardoso, George Siopsis, Shijun Yoshida
We investigate the stability of higher dimensional rotating black holes against scalar perturbations. In particular, we make a thorough numerical and analytical analysis of six-dim…
Reduction of Jacobi manifolds via Dirac structures theory
Fani Petalidou, Joana M. Nunes da Costa
We first recall some basic definitions and facts about Jacobi manifolds, generalized Lie bialgebroids, generalized Courant algebroids and Dirac structures. We establish an one-one…
New instability for rotating black branes and strings
Vitor Cardoso, José P. S. Lemos
The evolution of small perturbations around rotating black branes and strings, which are low energy solutions of string theory, are investigated. For simplicity, we concentrate on…
Is the U(1) symmetry restored at finite temperature or density?
Pedro Costa, M. C. Ruivo, C. A. de Sousa +1
We investigate the full U(3)U(3) chiral symmetry restoration, at finite temperature and density, on the basis of the three flavor Nambu-Jona-Lasinio model with the anomaly…
A Possible Boson Realization of the so(4)- and the so(3,1)-Algebra
S. Nishiyama, C. Providencia, J. da Providencia +2
As natural extensions of the boson realizations of the su(2)- and the su(1,1)-algebra, the so(4)- and the so(3,1)-algebras are presented in the form of boson realizations with four…
A Note on the Eigenvalue Problem in the su(1,1)-Algebra
S. Nishiyama, C. Providencia, J. da Providencia +2
Normalization constant in the eigenstate appearing in the eigenvalue problem of the su(1,1)-algebra is discussed. This normalization constant is expressed in terms of the Gauss' hy…