4 citations · 4 across the 2 of their papers we have counts for
4 papers
Global causality constraints in rotating scalar-tensor spacetimes
Bum-Hoon Lee, Nils A. Nilsson, Somyadip Thakur
Modified gravity is often formulated as an effective field theory (EFT), where higher-order corrections parametrize departures from General Relativity. We argue that such correctio…
Bumblebee Gravity -- Lessons from Perturbation Theory
Nils A. Nilsson
These proceedings summarise some recent efforts in understanding a class of vector-tensor theories known as {\it bumblebee} models, which spontaneously break local Lorentz and diff…
A no-go theorem in bumblebee vector-tensor cosmology
Carsten van de Bruck, Mohammad Ali Gorji, Nils A. Nilsson +2
Bumblebee models, a class of vector-tensor theories in which a vector field acquires a nonzero vacuum expectation value that spontaneously breaks spacetime symmetries, are ubiquito…
Induced Cosmological Anisotropies and CMB Anomalies by a non-Abelian Gauge-Gravity Interaction
Bum-Hoon Lee, Hocheol Lee, Wonwoo Lee +2
We present a non-abelian cousin of the model presented in \cite{Lee:2022rtz} which induces cosmological anisotropies on top of standard FLRW geometry. This is in some sense doing a…