Browsing Department of Physics by Title
Now showing items 235-254 of 1719
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D-branes and string field theory
(Massachusetts Institute of Technology, 2006)In this thesis we study the D-brane physics in the context of Witten's cubic string field theory. We compute first few terms the low energy effective action for the non-abelian gauge field A, from Witten's action. We show ... -
D-branes, gauge theory and string field theory
(Massachusetts Institute of Technology, 2002)In this thesis, we present several works done in last three years. They include three directions in the string theory. In the first direction, we use the brane setup to find mirror pairs of SO(n) and Sp(k) gauge groups for ... -
Dark energy and CMB anisotropy
(Massachusetts Institute of Technology, 2004)According to the WMAP and earlier COBE observations, the Cosmic Microwave Background (CMB) anisotropy power on large angular scales appears to be significantly lower than predicted by the standard model of cosmology. We ... -
Dark matter dynamics
(Massachusetts Institute of Technology, 2012)N-body simulations have revealed a wealth of information about dark matter halos but their results are largely empirical. Here we attempt to shed light on simulation results by using a combination of analytic and numerical ... -
Dark matter dynamics in the early universe
(Massachusetts Institute of Technology, 2012)We study a new form of dark matter interaction which may significantly affect the thermal relic abundance of dark matter. This new interaction takes the form C+D --> C+[phi], where D is the dark matter species present ... -
Dark noise calibration of the Super-Kamiokande outer detector
(Massachusetts Institute of Technology, 2004)The process for calculating the single photoelectron gain in the Super-Kamiokande outer detector has been streamlined. The original technique used optic fibers to expose the detector's photomultiplier tubes to known amounts ... -
The DarkLight experiment : searching for the dark photon
(Massachusetts Institute of Technology, 2012)We describe a setup to search for the existence of a massive gauge boson A', the "dark photon," mediating dark matter interactions with coupling strength [alpha]'. In certain models, the A' decays promptly but invisibly ... -
A data-driven neuromuscular model of walking and its application to prosthesis control
(Massachusetts Institute of Technology, 2013)In this thesis we present a data-driven neuromuscular model of human walking and its application to prosthesis control. The model is novel in that it leverages tendon elasticity to more accurately predict the metabolic ... -
Day-night and energy variations for maximal neutrino mixing angles
(Massachusetts Institute of Technology, 1999) -
Decay and interaction of neutral strange particles produced at cosmotron energies
(Massachusetts Institute of Technology, 1958) -
Defects, thermal phenomena and design in photonic crystal systems
(Massachusetts Institute of Technology, 2006)The physics of blackbodies has been an ongoing source of fascination and scientific research for over a hundred years. Kirchhoff's law states that emissivity and absorptivity are equal for an object in thermal equilibrium. ... -
The deformation of large telescope mirrors and optical quality
(Massachusetts Institute of Technology, 1996) -
Demonstrating visibly transparent solar cells and photodetectors
(Massachusetts Institute of Technology, 2017)The fabrication of inorganic semiconductor devices, such as silicon solar cells and photodetectors, is despite significant research still expensive and energy intensive. Especially for solar cells, high upfront costs are ... -
Density perturbations in hybrid inflation
(Massachusetts Institute of Technology, 2009)Inflation is a substantial modification to the big bang theory, and supernatural inflation is a hybrid inflation motivated from supersymmetry. In this thesis we carry out a one dimensional numerical simulation to verify ... -
Density profiles of plasmas confined by the field of a Levitating Dipole Magnet
(Massachusetts Institute of Technology, 2009)A 4-channel microwave interferometer (center frequency: 60 GHz) has been constructed to measure the density profiles of plasmas confined within the Levitated Dipole Experiment (LDX). LDX is the first and only experiment ... -
Depletion, quantum jumps, and temperature measurements of ⁸⁸Sr⁺ ions in a linear Paul Trap
(Massachusetts Institute of Technology, 2006)This thesis describes the design and construction of two laser systems to probe the 674nm transition of ⁸⁸Sr⁺ ions in a linear Paul trap. The first laser system made use of a molecular transition in Iodine to stabilize the ... -
Design and evaluation of a continuous-wave, step-tuneable far infrared source for solid state spectroscopy.
(Massachusetts Institute of Technology, 1975) -
Design and fabrication of sharp bend photonic crystal slab waveguides
(Massachusetts Institute of Technology, 2001)A periodic arrangement of atoms in a crystal presents a periodic potential for electrons. The bragg diffraction of electrons from the atoms may lead to a band gap, which represents a range of frequencies the electrons ... -
The design and implementation of a display-oriented editor writing system
(Massachusetts Institute of Technology, 1979) -
The design and implementation of a multi-programming virtual memory operating system for a mini-computer
(Massachusetts Institute of Technology, 1979)
