9 papers · 1 filter
Visions in Quantum Gravity
Luca Buoninfante, Benjamin Knorr, K. Sravan Kumar +36
To deepen our understanding of Quantum Gravity and its connections with black holes and cosmology, building a common language and exchanging ideas across different approaches is cr…
Massive spin 3 and Metric-Affine Gravity
Roberto Percacci, Ergin Sezgin
Symmetric Metric-Affine Gravity is a theory of gravity with an independent non-metric connection, and zero torsion. It can be thought of as ordinary metric gravity coupled to a ran…
Quantum fields and the cosmological constant
Renata Ferrero, Vincenzo Naso, Roberto Percacci
It has been shown that if one solves self-consistently the semiclassical Einstein equations in the presence of a quantum scalar field, with a cutoff on the number of modes, spaceti…
A New Class of Ghost and Tachyon Free Metric Affine Gravities
R. Percacci, E. Sezgin
We construct the spin-projection operators for a theory containing a symmetric two-index tensor and a general three-index tensor. We then use them to analyse, at linearized level,…
The Starobinsky model of inflation and Renormalizability
Roberto Percacci, Gian Paolo Vacca
The Starobinsky model was born in a cosmological scenario where conformally coupled matter quantum field fluctuations on the vacuum drive a non trivial semiclassical energy momentu…
Amplitudes and Renormalization Group Techniques: A Case Study
Diego Buccio, John F. Donoghue, Roberto Percacci
We explore the properties of a simple renormalizable shift symmetric model with a higher derivative kinetic energy and quartic derivative coupling, that can serve as a toy model fo…