Event calendar file
Astronomy and Astrophysics Seminars
A General Relativistic understanding of a Dark Matter dominated galaxy via Bertrand Spacetime
by Dr. Kaushik Bhattacharya (IIT Kanpur)
Tuesday, July 9, 2013
from
to
(Asia/Kolkata)
at Colaba Campus ( DAA A269 )
at Colaba Campus ( DAA A269 )
TIFR
| Description |
Bertrand spacetimes (BSTs) are static, spherically symmetric solutions of Einstein's equations, that admit stable, closed orbits. Starting from the fact that to a good approximation, stars in the disc or halo regions of typical galaxies move in such orbits, we propose that, under certain physical assumptions, the dark matter distribution of some low surface brightness (LSB) galaxies can seed a particular class of BSTs. In the Newtonian limit, it is shown that for flat rotation curves, our proposal leads to an analytic prediction of the NFW dark matter profile. |
