Now showing items 51-70 of 487

    • Chemical characteristics of three stellar streams 

      Gull, Maude. (Massachusetts Institute of Technology, 2019)
      In this thesis, we present high-resolution spectra of stars of three different stellar stream; Helmi debris stream, Helmi trail stream and [omega] Centauri stream. These stars have metallicities ranging from -3.05 < [Fe/HJ ...
    • A cluster algorithm for Gross-Neveu fermions at nonzero temperature 

      Harrison, Sarah Maureen (Massachusetts Institute of Technology, 2009)
      In this thesis we present results of lattice simulations of Gross-Neveu fermions in 1+1 dimensions. We re derive the representation of N flavors of Wilson fermions in terms of Ising spins on a 1 + 1 dimensional lattice ...
    • Coherent manipulations of trapped 88Sr+ using the 4D5/2 --> 5S1/2 transition 

      Shewmon, Ruth (Massachusetts Institute of Technology, 2008)
      The ability to control quantum systems with high fidelity is of fundamental importance to a variety of scientific experiments. This thesis describes the frequency stabilization of a laser which is used to coherently ...
    • Colliding bubble universes in eternal inflation 

      Thomas, Nathaniel C. (Nathaniel Cabot) (Massachusetts Institute of Technology, 2011)
      We briefly summarize arguments for inflation and discuss eternal inflation. We then discuss the motion of domain walls and null shells that form in two-bubble collision processes in both the global and in-bubble FRW ...
    • Collision induced decay of metastable baby skyrmions 

      Dwyer, Daniel A. (Daniel Andrew), 1976- (Massachusetts Institute of Technology, 2000)
      Many extensions of the standard model predict heavy metastable particles which may be modeled as solitons (skyrmions of the Higgs field), relating their particle number to a winding number. Previous work has shown that the ...
    • Compton polarimeter for Qweak Experiment at Jefferson Laboratory 

      Zou, David (Massachusetts Institute of Technology, 2011)
      The Qweak experiment at Jefferson Lab aims to make the first precision measurement of the proton's weak charge, QP = 1 - 4 sin 2 9w at Q2 = 0.026GeV 2 . Given the precision goals in the Qweak experiment, the electron beam ...
    • Computational investigations of nanophotonic systems 

      Venkataram, Prashanth Sanjeev (Massachusetts Institute of Technology, 2014)
      In this thesis, I developed code in the MEEP finite-difference time domain classical electromagnetic solver to simulate the quantum phenomenon of spontaneous emission and its enhancement by a photonic crystal. The results ...
    • Constraining the QSO luminosity function using gravitational lensing statistics 

      Fakhouri, Onsi Joe, 1983- (Massachusetts Institute of Technology, 2004)
      In this thesis we use gravitational lensing statistics to constrain the QSO luminosity function at a variety of redshifts. We present a theoretical discussion of gravitational lensing statistics and illustrate how high ...
    • Construction and characterization of a universally tunable modulator 

      Ackley, Sarah (Massachusetts Institute of Technology, 2008)
      Arbitrary admixtures of amplitude and phase modulated light can be used to generate linear, null-crossing error signals for locking Fabry-Perot cavities that are detuned from resonance by arbitrary amounts. Unfortunately, ...
    • Continuous detuning of an optical cavity with a Universally Tunable Modulator 

      Davis, Emily, S.B. (Emily J.) Massachusetts Institute of Technology (Massachusetts Institute of Technology, 2012)
      It is currently well-known how to lock an optical cavity on resonance using the Pound- Drever-Hall technique. It is also possible to lock a cavity at a single detuned length using an amplitude modulated laser beam. However, ...
    • Controlling light emission with shaped electron wavefunctions 

      Murdia, Chitraang (Massachusetts Institute of Technology, 2018)
      The extent to which can one change the nature of spontaneous emission from a free electron by shaping the its wavefunction has been a long-standing question. In this work, we use both a semi-classical formalism and a QED ...
    • Convex lens induced confinement : a novel study of weak and slow DNA & protein interactions 

      Mann, Ariana Joy (Massachusetts Institute of Technology, 2013)
      The newly developed single molecule microscopy method of flow cell-convex lens induced confinement (FC-CLIC) allows for the previously unobtainable probing of slow and weak DNA and protein interactions. Such measurements ...
    • Corner reflectors 

      Duboc, Charles A. (Charles Albert), 1923- (Massachusetts Institute of Technology, 1943)
    • Coronal properties of pre-main sequence stars in the Orion Trapezium Cluster 

      Shen, Nancy (Massachusetts Institute of Technology, 2012)
      Most of the young stars in the Orion Trapezium Cluster are much more peculiar in X-rays than expected, considering their structure, environment, and age. Highly resolved X-ray spectra provide many more details in order to ...
    • Cosmic microwave background predictions of supernatural inflation 

      Buttz, Catalina M. (Catalina Marie) (Massachusetts Institute of Technology, 2004)
      This thesis makes predictions for the temperature anisotropy spectrum of the CMB under the supernatural inflation model class [17] and compares these predictions against the Boomerang 98 data [5], using the Lange et. al ...
    • The cosmic ray muon energy spectum via Čerenkov radiation 

      Quintero, Eric Antonio (Massachusetts Institute of Technology, 2010)
      In this thesis, I designed and constructed a basic Cerenkov detector to measure the energy spectrum of cosmic ray muons for use in the graduate experimental physics courses, 8.811/2. The apparatus consists of a light-tight ...
    • Cosmic-ray interactions in charged-couple devices in the DMTPC 4-shooter detector 

      Choi, HyoJeong (Massachusetts Institute of Technology, 2013)
      The Dark Matter Time Projection Chamber (DMTPC) is a low pressure (CF 4) detector that measures the two-dimensional vector direction of nuclear recoils, and it aims to directly detect dark matter. This paper explores cosmic ...
    • Cosmological constraints from the virial mass function of nearby galaxy groups and clusters 

      Hill, James Colin (Massachusetts Institute of Technology, 2008)
      In this thesis, I present a new determination of the cluster mass function in a volume ~107 h-03 70 Mpc3 using the ROSAT-2MASS-FAST Group Survey (R2FGS). R2FGS is an X-ray-selected sample of systems from the ROSAT All-Sky ...
    • Cryogenic characterization of Josephson junctions 

      Brown, Keith Andrew (Massachusetts Institute of Technology, 2006)
      Cryogenic characterization is a crucial part of understanding the behavior of low-temperature quantum electronics. Reliable device testing provides the feedback to fabrication process development, facilitating the rapid ...
    • The crystal structure of cholesterol helical ribbons 

      Hossain, Chintan (Massachusetts Institute of Technology, 2007)
      Helical ribbons form in a many multi-component solutions containing sterols similar to cholesterol, but remarkably, almost all the helices have a pitch angle of 11⁰ or 54⁰. The consistent pitch angle of the ribbons may be ...