
Семинар 11 июня 2019. Maria Jose Guzman. Modified teleparallel gravity, degrees of freedom, and local Lorentz invariance
11 июня 2019, в 12:45 Кафедра физики высоких энергий и элементарных частиц María José Guzmán Monsalve (Universidad de La Serena, Chile) Modified teleparallel gravity, degrees of freedom, and local Lorentz invariance We will introduce the theoretical foundations of the teleparallel equivalent of general relativity, a theory of gravity where the fundamental field is the vielbein or tetrad instead of the metric tensor. This defines a nontrivial spacetime where torsion describes the gravitational phenomena, provided that the curvature is set to zero. We will consider several theories of modified gravity in the teleparallel formalism, in particular f(T) gravity. This kind of theories have gained popularity in recent years due to its versatility to predict new physics in both high and low energy regimes. Some modified teleparallel schemes have been successful in smoothing black hole singularities and making new predictions in cosmology. The theory comes with additional degree(s) of freedom due to the breaking of local Lorentz symmetry, whose physical interpretation remains to be understood, and nowadays it comprehends an active field of research. We will focus on the study of the additional degrees of freedom of modified teleparallel gravities through the DiracBergmann algorithm for constrained Hamiltonian systems, and its relation with the partial violation of local Lorentz symmetry.
Отправлено Wed, 05 Jun 2019 17:54:02 +0400
