Search
Now showing items 1-10 of 561
Three lessons in causality : what string theory has to say about naked singularities, time travel and horizon complementarity
(Massachusetts Institute of Technology, 2004)
We begin by presenting some results of studying certain axially symmetric super- gravity geometries corresponding to a distribution of BPS D6-branes wrapped on K3, obtained as extremal limits of a rotating solution. The ...
Optical, electronic, and dynamical phenomena in the shock compression of condensed matter
(Massachusetts Institute of Technology, 2003)
Despite the study of shock wave compression of condensed matter for over 100 years, scant progress has been made in understanding the microscopic details. This thesis explores microscopic phenomena in shock compression of ...
Colliding and moving Bose-Einstein condensates : studies of superfluidity and optical tweezers for condensate transport
(Massachusetts Institute of Technology, 2003)
In this thesis, two different sets of experiments are described. The first is an exploration of the microscopic superfluidity of dilute gaseous Bose-Einstein condensates. The second set of experiments were performed using ...
Electromagnetic wave scattering by discrete random media with remote sensing applications
(Massachusetts Institute of Technology, 2001)
The scattering of electromagnetic waves in medium with randomly distributed discrete scatterers is studied. Analytical and numerical solutions to several problems with implications for the active and passive remote sensing ...
X-ray spectroscopic and timing studies of galactic black hole binaries
(Massachusetts Institute of Technology, 2002)
In rare cases, optical observations of Galactic binary star systems which are bright in the X-ray portion of the electromagnetic spectrum dynamically constrain the mass of one component to be well above theoretical limits ...
Solar wind plasma : kinetic properties and micro-instabilities
(Massachusetts Institute of Technology, 2003)
The kinetic properties of ions in the solar wind plasma are studied. Observations of solar wind +H and +2He by the Faraday Cup instrument component of the Solar Wind Experiment on the Wind spacecraft show that these ions ...
Determinations of the radii, redshifts, and atmospheric compositions of neutron stars from modeling their Chandra X-ray spectra
(Massachusetts Institute of Technology, 2003)
Fitting the X-ray spectra of thermal radiation from neutron stars with realistic atmosphere models provides a way to place constraints on their radii, surface gravities and compositions, and to test general relativity in ...
Analysis of supersymmetric field theories via AdS/CFT, brane setups and matrix models
(Massachusetts Institute of Technology, 2003)
N = 1 theories whose matrix model spectral curve develops Argyres-Douglas singularities are constructed. The large N expansion breaks down at the critical points with domain wall tensions scaling as a fractional power of ...
String field theory and tachyon dynamics
(Massachusetts Institute of Technology, 2006)
In this thesis we present some works done during my doctoral studies. These results focus on two directions. The first one is motivated by tachyon dynamics in open string theory. We calculate the stress tensors for the ...
Transport of elliptic intense charged -particle beams
(Massachusetts Institute of Technology, 2006)
The transport theory of high-intensity elliptic charged-particle beams is presented. In particular, the halo formation and beam loss problem associated with the high space charge and small-aperture structure is addressed, ...