Arundhati Dasgupta

ENTROPIC ORIGIN OF HAWKING RADIATION

We describe a black hole slice by a density matrix and evolve the slice in semiclassical time to search for the origin of Hawking radiation.

The gravitational path integral and the trace of the diffeomorphisms

I give a resolution of the conformal mode divergence in the Euclidean gravitational path-integral by isolating the trace of the diffeomorphisms and its contribution to the Faddeev-Popov measure.

Quantum gravity effects on unstable orbits in Schwarzschild space-time

We study semiclassical corrections to the Schwarzchild metric and their effects on unstable orbits.

Semiclassical Loop Quantum Gravity and Black Hole Thermodynamics

In this article we explore the origin of black hole thermodynamics using semi- classical states in loop quantum gravity. We re-examine the case of entropy using a density matrix for a coherent state and describe correlations across the horizon due to SU(2) in- tertwiners. We further show that Hawking radiation is a consequence of a non-Hermitian term in the evolution operator, which is necessary for entropy production or depletion at the horizon. This non-unitary evolution is also rooted in formulations of irreversible physics.

Women in physics in Canada

While the overall climate for women physicists both in academia and industry has improved significantly over the past decade in Canada, it will be some time before women are well represented. Numbers of women in physics at all academic levels have increased, but are less than ideal at the full professor level. Organizations such as the Canadian Association of University Teachers and local initiatives are striving to minimize the socio-economic and professional gaps between women and men. The Canadian Association of Physicists, through its Committee to Encourage Women in Physics, and the Natural Sciences and Engineering Research Council are supportive and serve as catalysts, bringing together men and women to discuss and address issues concerning women in physics across Canada.