Talk detail

Participant	Das, Upasana
Institution	INDIAN INSTITUTE OF SCIENCE - C V RAMANE AVENUE ROAD - BANGALORE - KARNATAKA - India

Session	SO4	Accepted		Order	Time
Talk	Oral abstract	Title	Strongly magnetized cold electron degenerate gas: Mass-radius relation of the magnetized white dwarf
Co-authors
Abstract	We consider a relativistic, degenerate electron gas at zero-temperature under the influence of a strong, uniform, static magnetic field, which describes magnetized white dwarfs. Landau quantization changes the density of states available to the electrons, thus modifying the underlying equation of state. In the presence of very strong magnetic fields a maximum of one, two or three Landau level(s) is/are occupied. We study the equations of state of these one-level, two-level and three-level systems and compare them by taking three different maximum Fermi energies. We also find the effect of the strong magnetic field on the mass-radius relations of these white dwarfs. We obtain an exciting result that, it is possible to have magnetized white dwarfs, with a mass significantly greater than the Chandrasekhar limit in the range 2.3 - 2.6 M_sun, provided it has an appropriate magnetic field strength and central density. In fact, recent observations of peculiar Type Ia supernovae - SN 2006gz, SN 2007if, SN 2009dc, SN 2003fg - seem to suggest super-Chandrasekhar-mass white dwarfs with masses up to 2.4 - 2.8 M_sun, as their most likely progenitors and interestingly our results seem to lie within the observational limits. Such highly magnetized white dwarfs, which turn out to be more compact in size than their non-magnetized counterparts, are also likely to show pulsar like behaviour.