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71 papers · 1 filter
Heterotic Warm Inflation
Arjun Berera, Heliudson Bernardo, Suddhasattwa Brahma +3
We propose a two-field model of warm inflation motivated by a heterotic string construction, involving an axion and a dilaton-like scalar field with non-trivial kinetic mixing. Gau…
Matching the Vilkovisky-DeWitt Effective Action of Quantum Gravity to String Theory
Xavier Calmet, Elias Kiritsis, Folkert Kuipers +1
In this work, we discuss the matching of the Vilkovisky-DeWitt effective action of quantum gravity to an example of an ultra-violet complete theory of quantum gravity. We show how…
Quantum Gravitational Corrections in Cosmology
Xavier Calmet, Roberto Casadio, Marco Sebastianutti
We show how to reliably calculate quantum gravitational corrections to cosmological models using the unique effective action formalism for quantum gravity. Our calculations are mod…
Fermion Mass Generation without Symmetry Breaking
Charlie Cresswell-Hogg, Daniel F. Litim
We study the generation of fermion mass in a context where interactions break a discrete chiral symmetry. Then, fermion mass is not protected by a symmetry, no symmetry is broken b…
Scale symmetry breaking and generation of mass at quantum critical points
Charlie Cresswell-Hogg, Daniel F. Litim
We study an asymptotically free theory of relativistic Dirac fermions and a real scalar field coupled by Yukawa and scalar self-interactions in three dimensions using functiona…
Quantum Hair During Gravitational Collapse
Xavier Calmet, Roberto Casadio, Stephen D. H. Hsu +1
We consider quantum gravitational corrections to the Oppenheimer-Snyder metric describing time-dependent dust ball collapse. The interior metric also describes Friedmann-Lemaitre-R…