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- Space Telescope Science InstituteUS76 papers
- University of California, Santa CruzUS56 papers
- Centre National de la Recherche ScientifiqueFR51 papers
- Center for Astrophysics Harvard & SmithsonianUS47 papers
- University of Massachusetts AmherstUS44 papers
- Goddard Space Flight CenterUS41 papers
- Max Planck Institute for Extraterrestrial PhysicsDE37 papers
- Aix-Marseille UniversitéFR36 papers
- Astronomical Observatory of RomeIT36 papers
- University of MichiganUS36 papers
- Rochester Institute of TechnologyUS33 papers
- Texas A&M UniversityUS33 papers
8 papers · 1 filter
Spontaneous and Explicit Spacetime Symmetry Breaking in Einstein-Cartan Theory with Background Fields
Robert Bluhm, Yu Zhi
Explicit and spontaneous breaking of spacetime symmetry under diffeomorphisms, local translations, and local Lorentz transformations due to the presence of fixed background fields…
Gravity with Explicit Diffeomorphism Breaking
Robert Bluhm, Yumu Yang
Modified theories of gravity that explicitly break diffeomorphism invariance have been used for over a decade to explore open issues related to quantum gravity, dark energy, and da…
Gravity with explicit spacetime symmetry breaking and the Standard-Model Extension
Robert Bluhm, Hannah Bossi, Yuewei Wen
The Standard-Model Extension (SME) is the general phenomenological framework used to investigate Lorentz violation at the level of effective field theory. It has been used to obtai…
Gravity Theories with Background Fields and Spacetime Symmetry Breaking
Robert Bluhm
An overview is given of effective gravitational field theories with fixed background fields that break spacetime symmetry. The behavior of the background fields and the types of ex…
Spacetime Symmetry Breaking and Einstein-Maxwell Theory
Robert Bluhm
A vector model with a hybrid form of spacetime symmetry breaking consisting of explicit diffeomorphism breaking but spontaneous local Lorentz violation is presented. The combined e…
Explicit versus Spontaneous Diffeomorphism Breaking in Gravity
Robert Bluhm
Gravitational theories with fixed background fields break local Lorentz and diffeomorphism invariance either explicitly or spontaneously. In the case of explicit breaking it is kno…