Now showing items 281-290 of 357
Unitary renormalization of [φ 4 ] 2+1
(Springer-Verlag, 1971-12)
The two-space dimensional φ 4 interaction is renormalized by unitary transformation. A sequence of unitary operators is defined which transform a sequence of cut-off Hamiltonians, arranged in order of increasing cut-off ...
Polynomial Time Algorithms to Approximate Permanents and Mixed Discriminants Within a Simply Exponential Factor This research was partially supported by Alfred P. Sloan Research Fellowship, by NSF Grants DMS 9501129 and DMS 9734138, and by the Mathematical Sciences Research Institute, Berkeley, CA through NSF Grant DMS 9022140.
(John Wiley & Sons, Inc., 1999-01)
We present real, complex, and quaternionic versions of a simple randomized polynomial time algorithm to approximate the permanent of a nonnegative matrix and, more generally, the mixed discriminant of positive semidefinite ...
Cosmology with a Shock-Wave
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 2000-03)
We construct the simplest solution of the Einstein equations that incorporates a shock-wave into a standard Friedmann–Robertson–Walker metric whose equation of state accounts for the Hubble constant and the microwave ...
A mass zero cluster expansion. Part 2: Convergence
(Springer-Verlag, 1981-09)
Convergence is proven for the mass zero cluster expansion presented in Part 1 of this paper. An indication is given of changes necessary to treat the more difficult model and the lattice dipole gas.
To the boundary and back—a numerical study
(John Wiley & Sons, Ltd, 1991-07-05)
This study identifies the key parameters upon which energy absorption at artificial boundaries depends. A thorough numerical study is presented, of typical reflections from open computational boundaries, for problems ...
Oscillatory instability of traveling waves for a KdV-Burgers equation
(Elsevier, 1993-08-15)
The stability of traveling wave solutions of a generalization of the KdV-Burgers equation: [part]1u+up[part]xu+[part]3xu=[alpha][part]2xu, is studied as the parameters p and [alpha] are varied. The eigenvalue problem for ...