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4 papers · 1 filter
Formation and Evaporation of a Naked Singularity in 2D Gravity
Cenalo Vaz, Louis Witten
We describe a classical configuration of conformal matter forming a naked singularity and discuss its subsequent Hawking evaporation within the context of two dimensional dilaton g…
Ground State and Excitations of Disordered Boson Systems
Michael Ma, Pornthep Nisamaneephong, Lizeng Zhang
After an introduction to the dirty bosons problem, we present a gaussian theory for the ground state and excitations. This approach is physically equivalent to the Bogoliubov appro…
A Gaussian Theory of Superfluid--Bose-Glass Phase Transition
P Nisamaneephong, L. Zhang, M. Ma
We show that gaussian quantum fluctuations, even if infinitesimal, are sufficient to destroy the superfluidity of a disordered boson system in 1D and 2D. The critical disorder is t…
Factorizations of invertible operators and -theory of -algebras
Shuang Zhang
Let $\Scr A$ be a unital C*-algebra. We describe \it K-skeleton factorizations \rm of all invertible operators on a Hilbert C*-module $\Scr H_{\Scr A}$, in particular on $\Scr H=l^…