Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 128 for “"Hubble"”.
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A review of the Hubble tension
The Hubble constant H0 is the rate of expansion of the universe today. The discrepancy between the early universe H0 value, inferred using ΛCDM from Planck observations of the CMB, and the late universe H0 value, obtained using luminosity and distance measurements from a Type Ia Supernova (SNIa) …
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Astronomers and the Hubble space telescope: an historical analysis
In this thesis I describe a period in the Hubble Space Telescope's history during which a relatively small number of astronomers worked to encourage their colleagues to support the telescope project. I analyze astronomers' behavior in terms of the various problems which they faced. I argue that …
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Baryons in the Intergalactic Medium: A Hubble Spectroscopic Legacy Archive Search
… absorption in Quasar (QSO) spectra from the Hubble Spectroscopic Legacy Archive (HSLA) we can detect individual species present in the IGM. In this work, I build up and refine a pipeline to analyze 688 QSO spectra from the HSLA. At the end of the pipeline, there are multiple possible species …
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Cosmological backreaction : from the local Hubble expansion rate to dark energy
… of 200 Mpc. The cosmic variance of the local Hubble expansion rate is 10 per cent for spherical regions of radius 45 Mpc and 5 per cent for 60 Mpc. We compare our results to the data from the Hubble Space Telescope Key Project and the simulations in Newtonian cosmology and find excellent …
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Stellar occultation studies of Saturn's rings with the Hubble Space Telescope
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Design of a low-cost high speed data capture card for the Hubble Sphere Hydrogen Survey
… a low-cost high speed data capture card for the Hubble Sphere Hydrogen Survey (HSHS). The Hubble Space Hydrogen Survey was initiated in an effort to build a low-cost cylindrical radio telescope for an all sky redshift survey with the observational goal to produce a 3-dimensional mapping of the …
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Spectral measurements of hydrogen Lyman-alpha in the atmospheres of Venus and Jupiter using a sounding rocket and the Hubble Space Telescope
… Bulge. Images and spectra taken by the Hubble Space Telescope while the Bulge was on the limb were analyzed. The brightness and scale height of the atmosphere along the limb was derived from the image data.. The spectral data confirm evidence of a superthermal component and that is …
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A decision-making framework to determine the value of on-orbit servicing compared to replacement of space telescopes
The Hubble Space Telescope has demonstrated that on-orbit servicing can provide significant benefits for scientific space programs. Specifically, servicing missions can replace failed components to keep spacecraft operational, and can upgrade onboard components to improve spacecraft performance. …
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Refining the multi-field effects of Higgs inflation
… potential. Determining the behavior of the Hubble parameter, I found that successful inflation results in this model from a range of initial conditions. Based on calculations of the evolution of field perturbations by Courtney Peterson and Max Tegmark [6], the results suggest that the turn …
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Line-of-sight effects on strong lensing time delays
… line-of-sight effects on measurements of the Hubble constant from time delay cosmography. We find that images of lensed extended sources are those from which precise measurements of line-of-sight shears are most likely to be obtained, but that lensed point source images and time delay data can …
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Considerations for space and Naval aircraft applications of ferroelectric memory
… of Space Shuttle, Landsat, Intelsat V and Hubble Space telescope as well as the Navy E-2 Hawkeye and EA-6B Prowler aircraft are given as examples of possible space and Naval aviation applications of ferroelectric memory.
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Covariant perturbations in f (R) - gravity of multi-component fluid cosmologies
… for scales much smaller and much larger than the Hubble radius.
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Incorporation of GNSS multipath to improve autonomous rendezvous, docking and proximity operations in space
… demonstrated using GNSS data collected during Hubble Servicing Mission 4 (HSM4), a model of the mission geometry, electromagnetic (EM) ray tracing, and a custom GNSS software receiver. EM ray tracing is used to show that a number of signals sufficient for ranging are reflected by the Hubble …
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A Systems Framework for Multi-Messenger Astronomy
… first case study regards the measurement of the Hubble parameter, i.e. the rate of expansion of the universe, with joint gravitational-wave and electromagnetic detection of neutron star mergers — cosmological standard sirens. This case study predicts [formula] joint detections by the end of the …
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The Observational Diversity of sub-Neptunes
… Neptune TOI-674 b, observed with the \textit{Hubble} Space Telescope's WFC3/G141 instrument. My observations of this planet indicate the presence of both water vapor and opaque clouds in its atmosphere, and I present the results of atmospheric retrievals to support these conclusions. Next, I …
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Dual active galactic nuclei within Romulus25
… that many observed DAGNs may merge prior to a Hubble time, making them incredibly important to the LISA mission. DAGNs preferentially occupy the most massive galaxies at all redshifts and are comprised of mostly low mass ratio SMBH pairs. We also investigate if DAGN activity is a good tracer of …
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Temporal Evolution of the Fireball Cross Section through Percolation in Continuous Space
… υιοθετώντας μια εγκάρσια διαστολή τύπου Hubble για την πυρόσφαιρα. Παράλληλα, διερευνάται το ενδεχόμενο το σύστημα να διέρχεται παροδικά από ένα κρίσιμο σημείο κατά την εκτόνωσή του και προτείνονται κατάλληλα παρατηρήσιμα μεγέθη που μπορούν να φέρουν το χαρακτηριστικό αποτύπωμα αυτής της …
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Spectator fields and their imprints on the Cosmic Microwave Background
… slow roll during inflation, but well after the Hubble exit of the pivot scales, it may determine the cosmological perturbations. This thesis investigates how such a scalar field, the spectator, may leave its impact on the Cosmic Microwave Background (CMB) radiation and be consequently …
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The K- pi pi system in the reaction K-p -> K-pi+pi-p at 5.5 BeV/c
… beam at the ANL ZGS and the MURA 30 il hydrogen hubble chamber. As a part. of this experiment a study of the Kpipi system in the reaction K-pi -> K-pi+pi-p at 5.5 BeV/c has been carried out to The following results are obtained in this study (l) Evidence that the Deck mechanism plays a dominant …
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Análise de campos profundos da LMC imageados com o HST
… Camera 2 a bordo do telesc opio espacial Hubble para 7 campos distantes ~5º do centro da Grande Nuvem de Magalhães. Ajustamos isócronas aos diagramas cor-magnitude a fim de identficar diferentes populaões estelares nestes campos. Uma população velha (τ > 10¹º anos) foi encontrada em todos …
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