[JRG Seminar] Disorder-induced Length Scales and Faster Scalable Algorithms
* SPEAKERS
Name
Affiliation
E-mail
Dr. Vincent Sacksteder
APCTP
xzhou(at)apctp.org
* HOST(Applicant)
Name
Affiliation
E-mail
-
* DATE / TIME
2008-10-07, 16:00-17:00
* PLACE
Conference Room 512, APCTP, Hogil Memorial Bldg., POSTECH, Pohang, Korea
* ABSTRACT
This talk is about a way that obtaining a deeper understanding of disorder physics can speed up scientific calculations. A large fraction of the world\'s supercomputer time is devoted to calculating the density matrix, Green\'s function, matrix logarithm, and matrix exponential, each of which is essential to fields ranging from electronic structure to QCD to engineering. These problems are hard to distribute on a parallel computer, restricting calculations to small systems. However the physics of of disorder can introduce a new length scale into these problems, allowing them to be broken up into pieces, with a corresponding acceleration. This can be thought of as a numerical renormalization technique. I discuss what is known about disorder-based length scales and their applications, and sketch some possibilities for the future.
