324 citations · 2.7k across the 36 of their papers we have counts for
36 papers
Negative running of gravitational positivity
J. Fernandez, M. Ruhdorfer, J. Serra
We investigate the one-loop renormalization group evolution in four dimensions of the leading operators in the effective field theories of shift-symmetric scalars, photons, and gra…
Heavy neutron stars from light scalars
Reuven Balkin, Javi Serra, Konstantin Springmann +2
We study how light scalar fields can change the stellar landscape by triggering a new phase of nuclear matter. Scalars coupled to nucleons can develop a non-trivial expectation val…
White dwarfs as a probe of exceptionally light QCD axions
Reuven Balkin, Javi Serra, Konstantin Springmann +2
We study the effects of exceptionally light QCD axions on the stellar configuration of white dwarfs. At finite baryon density, the non-derivative coupling of the axion to nucleons…
Causality Constraints on Black Holes beyond GR
Francesco Serra, Javi Serra, Enrico Trincherini +1
We derive causality constraints on the simplest scalar-tensor theories in which black holes differ from what General Relativity predicts, a scalar coupled to the Gauss-Bonnet or th…
RG of GR from On-shell Amplitudes
Pietro Baratella, Dominik Haslehner, Maximilian Ruhdorfer +2
We study the renormalization group of generic effective field theories that include gravity. We follow the on-shell amplitude approach, which provides a simple and efficient method…
Runaway Relaxion from Finite Density
Reuven Balkin, Javi Serra, Konstantin Springmann +2
Finite density effects can destabilize the metastable vacua in relaxion models. Focusing on stars as nucleation seeds, we derive the conditions that lead to the formation and runaw…