Zobrazeno 1 - 10
of 556
pro vyhledávání: '"Scharf G"'
The integrated Berry curvature is a geometric property that has dramatic implications on material properties. This study investigates the integrated Berry curvature and other scattering mechanisms through their contribution to the anomalous Hall effe
Externí odkaz:
http://arxiv.org/abs/2401.09539
Autor:
Grigore, D. R., Scharf, G.
We analyze 2+1-dimensional gravity in the framework of quantum gauge theory. We find that Einstein gravity has a trivial physical subspace which reflects the fact that the classical solution in empty space is flat. Therefore we study massive gravity
Externí odkaz:
http://arxiv.org/abs/1008.1308
Autor:
Grigore, D. R., Scharf, G.
Publikováno v:
Gen.Rel.Grav.43:1323-1336,2011
We continue our investigation of massive gravity in the massless limit of vanishing graviton mass. From gauge invariance we derive the most general coupling between scalar matter and gravity. We get further couplings beside the standard coupling to t
Externí odkaz:
http://arxiv.org/abs/0912.1112
Autor:
Scharf, G.
As previously observed the massless limit of massive gravity leads to a modification of general relativity. Here we study spherically symmetric solutions of the modified field equations which contain normal matter together with a dark energy density.
Externí odkaz:
http://arxiv.org/abs/0901.1797
Autor:
Grigore, D. R., Scharf, G.
We determine the most general form of the interaction between the gravitational field and an arbitrary Yang-Mills system of fields (massless and massive). We work in the perturbative quantum framework of the causal approach (of Epstein and Glaser) an
Externí odkaz:
http://arxiv.org/abs/0808.3444
Autor:
Scharf, G.
Massive gravity previously constructed as the spin-2 quantum gauge theory is studied in the classical limit. The vector-graviton field v which does not decouple in the limit of vanishing graviton mass gives rise to a modification of general relativit
Externí odkaz:
http://arxiv.org/abs/0711.3749
Autor:
Grigore, D. R., Scharf, G.
Publikováno v:
Class.Quant.Grav.25:225008,2008
Both massless and massive gravity are derived from descent equations (Wess-Zumino consistency conditions). The massive theory is a continuous deformation of the massless one.
Comment: 8 pages, no figure
Comment: 8 pages, no figure
Externí odkaz:
http://arxiv.org/abs/0711.0869
Publikováno v:
Eur.Phys.J.C23:545-550,2002
The results concerning the $e^+e^-$ production in peripheral highly relativistic heavy-ion collisions presented in a recent paper by Baltz {\em{et al.}} are rederived in a very straightforward manner. It is shown that the solution of the Dirac equati
Externí odkaz:
http://arxiv.org/abs/hep-ph/0112193
Autor:
Scharf, G., Wellmann, M.
In the framework of causal perturbation theory we analyze the gauge structure of a massless self-interacting quantum tensor field. We look at this theory from a pure field theoretical point of view without assuming any geometrical aspect from general
Externí odkaz:
http://arxiv.org/abs/hep-th/9903055
Autor:
Aste, Andreas, Scharf, G"unter, Walther, Urs
Publikováno v:
Nuovo Cim. A111 (1998) 323-327
The importance of a rigorous definition of the singular degree of a distribution is demonstrated on the case of two-dimensional QED (Schwinger model). Correct mathematical treatment of second order vacuum polarization in the perturbative approach is
Externí odkaz:
http://arxiv.org/abs/hep-th/9805022