140 citations · 381 across the 6 of their papers we have counts for
6 papers
On How Neutrino Protects the Axion
Gia Dvali, Sarah Folkerts, Andre Franca
We show how the neutrino can sacrifice itself to quantum gravity and save the axion solution to the strong-CP problem. This mechanism puts an upper bound on the lightest neutrino m…
Massive spin-2 theories
Sarah Folkerts, Cristiano Germani, Nico Wintergerst
We give an introduction to massive spin-2 theories and the problem of their non-linear completion. We review the Boulware-Deser ghost problem and two ways to circumvent classic no-…
Axion Dark Matter and Planck favor non-minimal couplings to gravity
Sarah Folkerts, Cristiano Germani, Javier Redondo
Constraints on inflationary scenarios and isocurvature perturbations have excluded the simplest and most generic models of dark matter based on QCD axions. Considering non-minimal…
On ghosts in theories of self-interacting massive spin-2 particles
Sarah Folkerts, Alexander Pritzel, Nico Wintergerst
We consider general theories of a massive spin-2 particle on a Minkowski background. A decomposition of in terms of helicity eigenstates allows us to directly tes…
Asymptotic freedom of Yang-Mills theory with gravity
Sarah Folkerts, Daniel F. Litim, Jan M. Pawlowski
We study the behaviour of Yang-Mills theory under the inclusion of gravity. In the weak- gravity limit, the running gauge coupling receives no contribution from the gravitational s…
Physics of Trans-Planckian Gravity
Gia Dvali, Sarah Folkerts, Cristiano Germani
We study the field theoretical description of a generic theory of gravity flowing to Einstein General Relativity in IR. We prove that, if ghost-free, in the weakly coupled regime s…