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 15 of 15 for “"Microwave background radiation"”.
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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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Quasi-Optical Design and Analysis of a Bolometric Interferometer for Cosmic Microwave Background Radiation Experiments
… 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. Here we …
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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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Early universe cosmology as a probe of fundamental physics
… In particular, observations of the cosmic microwave background radiation supports the idea for an early phase of accelerated expansion called inflation. While the simplest inflationary models provide a consistent theoretical framework in explaining observational data, we are yet to …
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Multifield inflation and differential geometry
… them to compute non-gaussianities in the cosmic microwave background radiation spectrum.
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Supersymmetry, supergravity, and String Theory based inflationary cosmology
… analysis of precision measurements of the cosmic microwave background radiation. This comparison is achieved using observable derived constraints of the spectral index and tensor to scalar ratio.
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Data Analysis of the Cosmic Microwave Background
… about the origin of the universe. This radiation which has travelled more or less unchanged from 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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Polarization in the Sunyaev-Zeldovich effect
… in the intensity and polarization of the cosmic microwave background radiation (CMB) by inverse Compton scattering in clusters of galaxies (the Sunyaev-Zeldovich effects). We develop a Monte Carlo method for simulating these effects, based on the tensor formalism and kinetic equation. We also …
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Dark Matter Production after Inflation and Constraints
… the axion. We show that using the Cosmic Microwave Background radiation constraint on the effective number of relativistic species, an interesting constraint can be placed. This bound arises from the fact that the field whose angular excitations are the axions can be displaced from its …
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Investigation of Horn Optimisation, Simulation and Measurement Techniques, with Application to Integrating Cavity Based Pixel Design
… optical systems for use in future cosmic microwave background radiation and far infrared space based astronomy missions. Astronomical observations in these regions of the electromagnetic spectrum are vital for studying the formation and evolution of planets, stars, galaxies, and on an even …
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Computational Bayesian techniques applied to cosmology
… and supernovae data constraints, whilst cosmic microwave background radiation and Lyman-$\alpha$ forest constraints are less significant. Specific models with a conformal time symmetry in the Friedmann equation and with an additional dark energy component are tested and shown to be competitive …
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The instanton liquid and the axion
… quite generically, the dynamics for non-trivial backgrounds in the presence of light quarks is reminiscent of a strongly associating fluid. To deal with the well-known difficulty in simulating ionic fluids, we develop advanced algorithms based on Biased Monte Carlo techniques. We study the IILM …
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Investigating the properties of gamma ray bursts and gravitational wave standard sirens as high redshift distance indicators
… Baryon Acoustic Oscillations and the Cosmic Microwave Background Radiation - are not reliable enough to identify a small amount of intrinsic curvature, which partly justifies the common practice of assuming flat space in order to reduce the number of free parameters. However, we show that the …
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Experimental and analytical study of electrical crosstalk in CMB cold readout systems and implications for power spectra
The Cosmic Microwave Background Radiation (CMB) originated in the early phases of the life of the Universe, during the recombination epoch, when protons and electrons combined to form hydrogen, emitting photons that free-streamed to the present epoch. The CMB frequency and power spectra have been …
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Simulations of Galaxy Formation and Large Scale Structure
… Penzias and Wilson (1965) discovered the cosmic microwave background radiation, not only confirming the theory of the Big Bang, but also - as was observed later - revealing the origin of structure in the Universe. Today, cosmology and especially galaxy formation are fast paced exciting scientific …