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22 papers · 1 filter
Spectropolarimetric Observations of Supernovae
Alexei V. Filippenko, Douglas C. Leonard
We briefly review the existing database of supernova spectropolarimetry, concentrating on recent data and on results from our group's research. Spectropolarimetry provides the only…
Instability of the periodic nonlinear Schrodinger equation
Michael Christ, James Colliander, Terence Tao
We study the periodic non-linear Schrodinger equations with odd integer power nonlinearities, for initial data which are assumed to be small in some negative order Sobolev space, b…
Compactness in the d-bar Neumann problem, magnetic Schrodinger operators, and the Aharonov-Bohm effect
Michael Christ, Siqi Fu
Compactness of the d-bar Neumann operator is studied for weakly pseudoconvex bounded Hartogs domains in two dimensions. A nonsmooth example is constructed in which condition (P) fa…
Reconstructing Trees from Subtree Weights
Lior Pachter, David E Speyer
The tree-metric theorem provides a necessary and sufficient condition for a dissimilarity matrix to be a tree metric, and has served as the foundation for numerous distance-based r…
Imaging the Sunyaev Zel'dovich Effect using ACBAR on Viper
A. K. Romer, P. L. Gomez, C. M. Cantalupo +13
During 2001 and 2002, observations of several X-ray bright clusters of galaxies were conducted using the ACBAR Bolometer Array on the South Pole Viper telescope. A multi-frequency…
Ill-posedness for nonlinear Schrodinger and wave equations
Michael Christ, James Colliander, Terence Tao
The nonlinear wave and Schrodinger equations on Euclidean space of any dimension, with general power nonlinearity and with both the focusing and defocusing signs, are proved to be…