Alan Kostelecky

Matter-gravity couplings and Lorentz violation

The gravitational couplings of matter are studied in the presence of Lorentz and

Off-Shell Structure of the String Sigma Model

CPT

Lorentz- and CPT-violating models for neutrino oscillations

violation. At leading order in the coefficients for Lorentz violation, the relativistic quantum Hamiltonian is derived from the gravitationally coupled minimal standard-model extension. For spin-independent effects, the nonrelativistic quantum Hamiltonian and the classical dynamics for test and source bodies are obtained. A systematic perturbative method is developed to treat small metric and coefficient fluctuations about a Lorentz-violating and Minkowski background. The post-Newtonian metric and the trajectory of a test body freely falling under gravity in the presence of Lorentz violation are established. An illustrative example is presented for a bumblebee model. The general methodology is used to identify observable signals of Lorentz and

Lorentz- and CPT-violating extension of the standard model

CPT

Comments on Lorentz and CPT Violation

violation in a variety of gravitational experiments and observations, including gravimeter measurements, laboratory and satellite tests of the weak equivalence principle, antimatter studies, solar-system observations, and investigations of the gravitational properties of light. Numerous sensitivities to coefficients for Lorentz violation can be achieved in existing or near-future experiments at the level of parts in

2010 Data Tables for Lorentz and CPT Violation

{10}^{3}

Theory and Status of Lorentz Violation

down to parts in

Recent Progress in Lorentz and CPT Violation

{10}^{15}

Hamiltonian Constraint Analysis of Vector Theories with Spontaneous Lorentz Violation

. Certain coefficients are uniquely detectable in gravitational searches and remain unmeasured to date.

Bounds on CPT and Lorentz violation from experiments with kaons

The off-shell structure of the string sigma model is investigated. In the open bosonic string, nonperturbative effects appear to depend crucially on the regularization scheme. A scheme retaining the notion of string width reproduces the structure of Wittens string field theory.