Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2005. / Includes bibliographical references (p. 63-67). / In this thesis, the aging and the rejuvenation of an ATLAS proportional drift tube are described. Firstly, the Diethorn model of gain is tested using pressure and sense-wire voltage measurements. The drift tube was then aged using P10 gas (Ar:CH₄ 90:10) and a small amount of Si oil vapor, with a tube section of radius [approx.] 1 cm being subjected to UV radiation. An aging current of 30[mu]A was maintained and after the accumulation of 21 coulombs on the wire, the tube gain decreased to less than 70%. Subsequently, the tube was rejuvenated by the treatment with Ar:0₂ 99:1 gas, at reverse wire potential and an reverse "rejuvenation" current of 30[mu]A. Rejuvenation was successful after the accumulation of the equivalent of 3C from this current. / by Yue Shi. / S.B.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997. / Includes bibliographical references (p. 177-184). / by James Joseph Childs, Jr. / Ph.D.

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011. / Cataloged from PDF version of thesis. / Includes bibliographical references (p. 49-52). / The AdS/CFT correspondence has provided a new tool to investigate strongly correlated systems in condensed matter physics. This thesis presents the computation of retarded fermion Green functions at finite density and zero temperature in the nonrelativistic gauge/gravity duality. We find evidence of Fermi surfaces and investigate their properties. We show that the near-horizon scaling dimension, an important quantity that controls the low-energy excitations of the theory, depends on the momentum along the "extra" direction in nonrelativistic gauge/gravity duality. / by Raghu Mahajan. / S.B.

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011. / Cataloged from PDF version of thesis. / Includes bibliographical references (p. 48-50). / 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 coordinates. Comments are made regarding possible observational signals. / by Nathaniel C. Thomas. / S.B.

Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1957. / MIT copy bound with: Pulsed sinusoidal second sound waves in liquid helium below 1K̊. / Peter Michael Richards and Joseph Stanley Rosenshein. 1957. / Includes bibliographical references (leaf [14]). / by Richard Kumeo Yamamoto. / B.S.

Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2018. / Cataloged from PDF version of thesis. / Includes bibliographical references (pages 37-40). / Self-interacting dark matter, which serves as an alternative to collisionless cold dark matter, may be useful for solving the small-scale galaxy formation problems present in the Lambda-Cold Dark Matter model. So far, most self-interacting dark matter simulations have considered only elastic collisions between particles. Using the results of a numerical implementation in the AREPO code, the effects of two-state inelastic dark matter on the density profiles, velocity dispersions, pseudo-phase-space density profiles, orbital anisotropy parameter profiles, and principal axis ratios of galactic halos are examined. We find that inelastic self-interacting dark matter halos differ from both cold dark matter halos and elastic self-interacting dark matter halos in density profiles, in velocity dispersion profiles, in pseudo-phase-space density profiles, and in orbital anisotropy parameter profiles, while the shapes of the halos generated by elastic and inelastic self-interacting dark matter models are relatively similar. / by Karia Radha Dibert. / S.B.

Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2013. / Cataloged from PDF version of thesis. / Includes bibliographical references (page 45). / We examine the notion that supermassive black holes at the centre of galaxies, such as the Milky Way, could have been seeded in the early universe by the mechanisms of hybrid inflation. Using luminosity data, we estimate the current density of supermassive black hole. We develop the formalism of the dierct integration method in hybrid inflation and obtain a power spectrum, which we try to relate to the literature. Our results do not directly show the plausibility of seeding supermassive black holes, but the shape of the power spectrum suggests that further work might yield positive results. / by Alexis Giguere. / S.B.

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2007. / Includes bibliographical references (p. 77-81). / I describe the detection of 201 highly significant dips in the count rate of Sco X-1 from a search of some 500 ks of archival RXTE PCA data, which could be caused by TNO occultations. I show that most of these dips are correlated with particle showers in the PCA, suggesting that the dips in count rate result from large amounts of charge built up in the detectors. From the distribution of particle counts in the PCA and examination of asymmetry in individual dip profiles, I establish that at most ~ 6 of these dip events can be caused by occultations. This gives an upper limit on the cumulative TNO size distribution for > 20 m radius. I also derive a model lightcurve for occultations of Sco X-1 from diffraction theory, and use this model to predict properties of an ensemble of occultation events. Implications for future work are discussed. / by Tucker Anthony Jones. / S.B.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1932. / Vita. / Includes bibliographical references (leaves 85-90). / by David G. C. Luck. / Ph.D.

Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2016. / Cataloged from PDF version of thesis. / Includes bibliographical references (pages 49-50). / Project 8 presents a new modality of electron spectroscopy with the potential to exceed the resolution of the most precise electron spectrometers in operation today, potentially at much lower cost. Project 8, being a novel method, has different computational demands from existing experiments. This thesis explores the use of the Hough Transform as a tool in data processing in Project 8 and discusses its utility and function generally. / by Theodora C. Kunicki. / S.B.