9 September 2019 from 10:30 to 11:30

PhD defence of Stefano Lucat

Inflation and Weyl symmetry in extended theories of gravity: A new take on gauging Weyl symmetry

In this thesis I have studied the possibility of extending the symmetries of the gravitational theory proposed by A. Einstein, to include scale transformations. A theory that exhibit scale invariance is the same at all lengths, and does not possess any intrinsic notion of scale or length. For this reason, the first non trivial consequence of such an assumption is that the famous Planck length, a fundamental length scale obtained by combining the gravitational constant with the Planck constant and the speed of light, cannot be a ''constant''. Instead, it is produced by the condensation of a scalar field, which can be interpreted as the order parameter in the breaking of scale invariance. We produced a toy model for such a process, which can also explain cosmic inflation, at least for a certain range of parameters.

Start date and time
9 September 2019 10:30
End date and time
9 September 2019 11:30
PhD candidate
S. Lucat
Dissertation
Inflation and Weyl symmetry in extended theories of gravity: A new take on gauging Weyl symmetry
PhD supervisor(s)
prof. dr. S.J.G. Vandoren
Co-supervisor(s)
dr. T. Prokopec