5 papers
3+1 Formulation of the Standard-Model Extension Gravity Sector
Kellie O'Neal-Ault, Quentin G. Bailey, Nils A. Nilsson
We present a 3+1 formulation of the effective field theory framework called the Standard-Model Extension in the gravitational sector. The explicit local Lorentz and diffeomorphism…
Preferred-frame Effects, the Tension, and Probes of Hořava-Lifshitz Gravity
Nils A. Nilsson
We discuss implications on the tension due to preferred-frame effects in the context of Hořava-Lifshitz gravity. By using a combination of low-redshift data (Sne1a, elliptica…
A 3+1 Decomposition of the Minimal Standard-Model Extension Gravitational Sector
Nils A. Nilsson, Kellie O'Neal-Ault, Quentin G. Bailey
The 3+1 (ADM) formulation of General Relativity is used in, for example, canonical quantum gravity and numerical relativity. Here we present a 3+1 decomposition of the minimal Stan…
Cosmology in a toy model of Lorentz breaking gravity
Nils A. Nilsson, Mariusz P. Dabrowski
We explore cosmological solutions to Lorentz breaking gravity using the gravitational sector of the Standard Model Extension (SME). By using a simple toy model for Lorentz violatio…
Hořava-Lifshitz cosmology in light of new data
Nils A. Nilsson, Ewa Czuchry
We present new observational constraints on Lorentz violating Hořava-Lifshitz cosmological scenarios using an updated cosmological data set from Cosmic Microwave Background (Planck…