Poincaré Gauge Gravity: stability, phenomenology, and prospects.

Abstract: Poincaré Gauge Gravity is a theory quadratic in both curvature and torsion, which is constructed by requiring that the gravitational theory must be invariant under local Poincaré transformations. In this talk I will present the main outcomes of my PhD thesis related to this theory. First, I will expose some results about the stability of the quadratic Poincaré Gauge Lagrangian, and prove that only the two scalar degrees of freedom can propagate without introducing pathologies. I will make emphasis on the form of the bi-scalar stable Lagrangian, and give some applications of this particular theory. Then, in order to see which kind Black Hole solutions we can expect in Poincaré Gauge theories, I will study Birkhoff's and no-hair theorems under physically relevant conditions. Finally, I will show an ultraviolet extension of Poincaré Gauge theories by introducing non-local terms into the action, which can ameliorate the singular behaviour at large energies. I will present solutions of this theory at the linear level, and prove that such solutions are ghost- and singularity-free

astrophysicscondensed mattergeneral relativity and quantum cosmologyhigh energy physicsmathematical physicsclassical physicsgeneral physics

Audience: researchers in the topic

Theoretical physics seminar @ Tartu