Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics
Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics
Violation of Chandrasekhar mass limit: Strongly magnetized white dwarfs as progenitors of super-Chandrasekhar type Ia supernovae Upasana Das, Banibrata Mukhopadhyay Department of Physics, Indian Institute of Science, Bangalore 560012, India upasana@physics.iisc.ernet.in, bm@physics.iisc.ernet.in November 15, 2012 Abstract 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 solar mass, as their most likely progenitors. We show that strongly magnetized white dwarfs can violate the Chandrasekhar mass limit (which is 1.44 solar mass) significantly, owing to the Landau quantization of the relativistic electron degenerate gas. Interestingly, our results seem to lie within the above observational limits. We also establish that accretion on to commonly observed magnetized white dwarfs, coupled with the phenomenon of flux freezing, leads to the generation of very strong magnetic fields in the interiors of these white dwarfs. This would in turn explain the super-Chandrasekhar masses according to our proposed theory. 1
Superfluidity in Bricks! Arijit Haldar and Vijay B. Shenoy Centre for Condensed Matter Theory Indian Institute of Science, Bangalore 560 012 An optical brick lattice has recently be realized by the ETH group. We show that this systems offers the possibility of realizing a superfluid state of fermions with a high transition temperature. The brick lattice defined by three hopping parameters, in a regime, has a band gap. Exploiting this, we propose to the band insulator obtained in this regime to beat the entropy problem, to obtain an optical lattice superfluid by tuning an attractive interaction between the fermions. By studying the quantum field theory of the system including Gaussian fluctuations, we estimate the Kosterlitz- Thouless transition temperature of the system. We find that in a regime of parameters the transition temperature is “ high” , i.e., of the order of the hopping scale. See also: Related poster by Yogeshwar Prasad et al.
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Violation <strong>of</strong> Chandrasekhar mass limit: Strongly<br />
magnetized white dwarfs as progenitors <strong>of</strong><br />
super-Chandrasekhar type Ia supernovae<br />
Upasana Das, Banibrata Mukhopadhyay<br />
Department <strong>of</strong> <strong>Physics</strong>, Indian Institute <strong>of</strong> Science, Bangalore 560012, India<br />
upasana@physics.iisc.ernet.in, bm@physics.iisc.ernet.in<br />
November 15, 2012<br />
Abstract<br />
Recent observations <strong>of</strong> peculiar Type Ia supernovae - SN 2006gz, SN 2007if,<br />
SN 2009dc, SN 2003fg - seem to suggest super-Chandrasekhar-mass white dwarfs<br />
with masses up to 2.4 - 2.8 solar mass, as their most likely progenitors. We show<br />
that strongly magnetized white dwarfs can violate the Chandrasekhar mass limit<br />
(which is 1.44 solar mass) significantly, owing to the Landau quantization <strong>of</strong> the<br />
relativistic electron degenerate gas. Interestingly, our results seem to lie within<br />
the above observational limits. We also establish that accretion on to commonly<br />
observed magnetized white dwarfs, coupled with the phenomenon <strong>of</strong> flux freezing,<br />
leads to the generation <strong>of</strong> very strong magnetic fields in the interiors <strong>of</strong> these white<br />
dwarfs. This would in turn explain the super-Chandrasekhar masses according to<br />
our proposed theory.<br />
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