Doctor of Philosophy Oral Defense: Madhurima Bhattacharjee

DateJuly 1, 2019Time1:30 - 3:30 pm
LocationBaylor Sciences Building, Room E.234
Description
Doctor of Philosophy Oral Defense

Madhurima Bhattacharjee

Advisor: Anzhong Wang

Gravitational Radiation and Black Hole Formation from Gravitational Collapse in Theories of Gravity with Broken Lorentz Symmetry

Quantum gravity is expected to contain Lorentz symmetry only as an emergent low energy symmetry with the scale at which it is broken presently inaccessible to current experiments. This dissertation is centered around understanding various physical aspects of gravitational theories that modify general relativity by explicitly breaking Lorentz symmetry (viz. Horava-Lifshitz gravity and Einstein-aether theory) in the gravitational sector such that they are consistent with all current observations. It consists of an analytical study of black hole solutions in 2D Horava gravity which is non-minimally coupled with a nonrelativistic scalar field with a focus on understanding Hawking radiation and the properties of the universal horizons. It includes an investigation of gravitational plane wave solutions in Einstein-aether theory and their behavior, especially how they may be potentially distinguishable by present or future detectors from the standard prediction of general relativity. Lastly, it includes a numerical study of gravitational collapse of a massless scalar field in Einstein-aether theory showing the existence of outermost “dynamical Universal horizons (dUHs)". Such a dUH evolves into the causal boundary, even for excitations with arbitrarily large speeds of propagation.

PublisherDepartment of Physics
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