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29 papers · 1 filter
Induced representations of quantum kinematical algebras
O. Arratia, M. A. del Olmo
We construct the induced representations of the null-plane quantum Poincaré and quantum kappa Galilei algebras in (1+1) dimensions. The induction procedure makes use of the concept…
Lie symmetries of difference equations
D. Levi, J. Negro, M. A. del Olmo
The discrete heat equation is worked out in order to illustrate the search of symmetries of difference equations. It is paid an special attention to the Lie structure of these symm…
All electron and pseudopotential study of the spin polarization of the V (001) surface: LDA versus GGA
R. Robles, J. Izquierdo, A. Vega +1
The spin-polarization at the V(001) surface has been studied by using different local (LSDA) and semilocal (GGA) approximations to the exchange-correlation potential of DFT within…
Discrete derivatives and symmetries of difference equations
D. Levi, J. Negro, M. A. del Olmo
We show on the example of the discrete heat equation that for any given discrete derivative we can construct a nontrivial Leibniz rule suitable to find the symmetries of discrete e…
Quantum Jordanian twist
Vladimir Lyakhovsky, Alexandr Mirolubov, Mariano del Olmo
The quantum deformation of the Jordanian twist F_qJ for the standard quantum Borel algebra U_q(B) is constructed. It gives the family U_qJ(B) of quantum algebras depending on param…
A generalized linear Hubble law for an inhomogeneous barotropic Universe
J. -F. Pascual-Sánchez
In this work, I present a generalized linear Hubble law for a barotropic spherically symmetric inhomogeneous spacetime, which is in principle compatible with the acceleration of th…