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14 papers · 1 filter
Quantitative Spectroscopy of Supernovae for Dark Energy Studies
E. Baron, David Branch, David Jeffery +6
Detailed quantitative spectroscopy of Type Ia supernovae (SNe~Ia) provides crucial information needed to minimize systematic effects in both ongoing SNe Ia observational programs s…
Outshining the quasars at reionisation: The X-ray spectrum and lightcurve of the redshift 6.29 Gamma-Ray Burst GRB050904
D. Watson, J. N. Reeves, J. Hjorth +7
Gamma-ray burst (GRB) 050904 is the most distant X-ray source known, at z=6.295, comparable to the farthest AGN and galaxies. Its X-ray flux decays, but not as a power-law; it is d…
Composite domain walls in flat nanomagnets: the magnetostatic limit
H. Youk, G. -W. Chern, K. Merit +2
We discuss the structure of the so-called "vortex" domain walls in soft magnetic nanoparticles. A wall of this kind is a composite object consisting of three elementary topological…
Topological defects in flat nanomagnets: the magnetostatic limit
G. -W. Chern, H. Youk, O. Tchernyshyov
We discuss elementary topological defects in soft magnetic nanoparticles in the thin-film geometry. In the limit dominated by magnetostatic forces the low-energy defects are vortic…
On the origin of non-Gaussian statistics in hydrodynamic turbulence
C. Meneveau, Y. Li
Turbulent flows are notoriously difficult to describe and understand based on first principles. One reason is that turbulence contains highly intermittent bursts of vorticity and s…
A counterexample to dispersive estimates for Schrödinger operators in higher dimensions
M. Goldberg, M. Visan
In dimension we show the existence of a compactly supported potential in the differentiability class , , for which the solutions to the linear Schrödinge…