193 citations · 1k across the 26 of their papers we have counts for
27 papers
Non-perturbative quantum Galileon in the exact renormalization group
Christian F. Steinwachs
We investigate the non-perturbative renormalization group flow of the scalar Galileon model in flat space. We discuss different expansion schemes of the Galileon truncation, includ…
Scalaron-Higgs inflation reloaded: Higgs-dependent scalaron mass and primordial black hole dark matter
Anirudh Gundhi, Christian F. Steinwachs
We propose an extension of the scalaron-Higgs model by a non-minimal coupling of the Standard Model Higgs boson to the quadratic Ricci scalar resulting in a Higgs-dependent scalaro…
Primordial black hole dark matter in dilaton-extended two-field Starobinsky inflation
Anirudh Gundhi, Sergei V. Ketov, Christian F. Steinwachs
We investigate the production of primordial black holes and their contribution to the presently observed dark matter in a dilaton two-field extension of Starobinsky's quadratic $f(…
Towards a unitary, renormalizable and ultraviolet-complete quantum theory of gravity
Christian F. Steinwachs
For any fundamental quantum field theory, unitarity, renormalizability, and relativistic invariance are considered to be essential properties. Unitarity is inevitably connected to…
Naked singularities in quadratic f(R) gravity
Enrique Hernandéz-Lorenzo, Christian F. Steinwachs
We find new static, spherically symmetric, and asymptotically flat vacuum solutions without horizon in Starobinsky's quadratic f(R) gravity. We systematically classify these soluti…
Combinatorial aspects in the one-loop renormalization of higher derivative theories
Christian F. Steinwachs
An efficient way to calculate one-loop counterterms within the Feynman diagrammatic approach and dimensional regularization is to expand the propagators in the integrands of the Fe…