This line investigates the quantum processes in intense gravitational fields and the appearance of new spatiotemporal symmetries. The combination of Quantum Field Theory with General Relativity is studied and its application to black holes (Hawking radiation) and to Cosmology (primitive universe, inflation, etc.). The classic and quantum aspects of the modification of einstenian gravity are also investigated as well as the use of supersymmetry and non-commutative geometries in the search for a quantum theory of gravity.