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 113 for “"Cosmic Microwave Background"”.
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Fluctuations in the cosmic microwave background
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Data Analysis of the Cosmic Microwave Background
… the earliest times until today is called the cosmic microwave background radiation, and is the topic of this Ph.D. thesis.
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The cosmic microwave background: gaussianity and polarization
The Cosmic Microwave Background (CMB) is a window to the earliest parts of the universe that we can still directly see. As such, it provides excellent data for testing the currently accepted model of cosmology: an expanding Friedmann-Robertson-Walker spacetime that is statistically described by …
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Cosmic microwave background predictions of supernatural inflation
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 [11] cosmological parameter estimations for an [Omega]tot = 1 universe. This …
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FOREGROUND CONTROL AND CHARACTERIZATION IN COSMIC MICROWAVE BACKGROUND EXPERIMENTS
… detected as a blackbody spectrum in the microwave range. Measuring its intensity anisotropies and the so-called E-modes polarization pattern have proven to be powerful tools to constrain the cosmological parameters to sub-percent precision. The present and future challenges in CMB …
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Post-inflationary non-Gaussianities on the cosmic microwave background
The cosmic microwave background (CMB) provides unprecedented details about the history of our universe and helps to establish the standard model in modern cosmology. With the ongoing and future CMB observations, higher precision can be achieved and novel windows will be opened for studying …
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Spectator fields and their imprints on the Cosmic Microwave Background
… the spectator, may leave its impact on the Cosmic Microwave Background (CMB) radiation and be consequently constrained. We first introduce the observables of the CMB, namely the power spectrum Pζ , spectral index ns and its running dns/d ln k, the non-Gaussianities fNL, gNL and τNL, and the …
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New Approaches to Map-Making for Cosmic Microwave Background Observations
Extragalactic point sources are an additional foreground contaminant in CMB maps; proper identification and removal of these sources is a crucial step in the analysis pipeline. From the standpoint of Extragalactic Astrophysics, point source data from the WMAP instrument can provide important …
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Detectors for measuring B-modes in the Cosmic Microwave Background
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Measuring cosmic microwave background radiation anisotropy on medium angular scales
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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Statistical Analysis of the Cosmic Microwave Background: Power Spectra and Foregrounds
Finally, I examine the effect of Galactic foreground contamination on CMB experiments and describe the principle foregrounds. I show that it is possible to include the foreground components in a self-consistent fashion within the statistical framework of MAGIC and give explicit examples of how this …
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Cosmology from galaxy clusters with cosmic microwave background lensing mass calibration
… 439 Sunyaev-Zel’dovich-detected clusters, with a cosmic microwave background (CMB) lensing calibration of the cluster masses. As demonstrated by Planck, galaxy clusters detected through their SZ signature offer a powerful way to constrain cosmological parameters such as Ωm, which parametrises the …
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Cosmic microwave background anisotropies in the presence of a weak magnetic field
One of the questions cosmology still has not satisfactorily resolved is the origin of magnetic fields in the universe. These have been observed at all scales where man has c:evised means to observe them, from stellar scales, to intergalactic and intercluster scales. Indeed, there is no reason to …
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Quasi-Optical Design and Analysis of Bolometric Interferometers for Cosmic Microwave Background Experiments
… to measure the polarisation anisotropies of the cosmic microwave background. The polarisation signal is so low and difficult to measure that very accurate modelling and a deep understanding and characterisation of the instruments used to make such measurements is essential. The two instruments …
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Quasi-Optical Design and Analysis of a Bolometric Interferometer for Cosmic Microwave Background Radiation Experiments
… a group met to propose the idea of observing the Cosmic Microwave Background (CMB) in order to determine its polarisation properties, i.e. E- and B-modes. B-modes, a smoking gun for inflation theory, are a long sought after observation for cosmologists. From this the QUBIC collaboration was born. …
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Polishing the Lenses: Refined Modelling of Gravitational Lensing and Delensing of the Cosmic Microwave Background
The cosmic microwave background (CMB) is made up of photons, the majority of which last scattered with electrons during the era of cosmic recombination, at redshift z~1100. They have been travelling, virtually undisturbed, ever since. Along their journey, however, the photons' paths are deflected …
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Exploring The Universe With The Atacama Cosmology Telescope: Polarization-Sensitive Measurements Of The Cosmic Microwave Background
… the past twenty-five years, observations of the Cosmic Microwave Background (CMB) temperature fluctuations have served as an important tool for answering some of the most fundamental questions of modern cosmology: how did the universe begin, what is it made of, and how did it evolve? More …
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A measurement of the cosmic microwave background radiation (CMBR) anisotropy at the half degree angular scale
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Rayleigh scattering of the Cosmic Microwave Background: Towards a first detection with the next generation of surveys.
The cosmic microwave background (CMB) has been a treasure trove for cosmology. CMB experiments such as Planck have put stringent constraints on the now standard model for Cosmology: ΛCDM. Over the next decade, current and planned CMB experiments are expected to exhaust nearly all primary CMB …
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