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 828 for “"constraining"”.
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Constraining credences
This dissertation is about ways in which our rational credences are constrained: by norms governing our opinions about counterfactuals, by the opinions of other agents, and by our own previous opinions. In Chapter 1, I discuss ordinary language judgments about sequences of counterfactuals, and then …
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Constraining fundamental physics from cosmology
I use mathematical models and numerical simulations to constrain cosmological inflation, the seeds of structure, and the mass of the neutrino. I revisit arguments that simple models of inflation with a small red tilt in the scalar power spectrum generically yield an observable tensor spectrum. I …
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Constraining the Quenching Mechanisms in Galaxies
A number of theoretical mechanisms have been invoked to explain the transformation of star forming galaxies into quenched galaxies, such as the removal of gas by active galactic nuclei- (AGN) and star formation-driven galactic outflows, and the heating of the galaxy halo and subsequent halting of …
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Constraining black carbon emission inventories with observations
… which were not addressed in previous emission constraining studies. Overall, the method built in this work helps improve the historical BC emission inventory and the discrepancy analysis provides better quantification of the biases in model-measurement comparison. Observational constraints …
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Constraining Planetary Science Problems with Micro-Paleomagnetism
With the development of micro-paleomagnetic techinques we can measure the magnetic field of micro-scale samples that have direct implications for problems in planetary science. In this thesis I used the techniques from micro-paleomagnetism to address two main problems: (1) when Earth’s magnetic …
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Constraining climate impact uncertainties from future aviation
Environmental impacts from the aviation sector are in continuous growth. The total sector contribution to anthropogenic climate forcing is approximately 3.5%, representing up to 9% of US greenhouse gas emissions from transportation in 2018. Despite the COVID-19 crisis, it is also expected to grow …
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Constraining New Physics with Colliders and Neutrinos
In this work, we examine how neutrino and collider experiments can each and together put constraints on new physics more stringently than ever. Constraints arise in three ways. First, possible new theoretical frameworks are reviewed and analyzed for the compatibility with collider experiments. We …
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Constraining the UV background with the proximity effect
After the epoch of reionisation the intergalactic medium (IGM) is kept at a high photoionisation level by the cosmic UV background radiation field. Primarily composed of the integrated contribution of quasars and young star forming galaxies, its intensity is subject to spatial and temporal …
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Constraining North Atlantic circulation with transient tracer observations
… between 4.5⁰S and 39.5⁰N of the North Atlantic. Constraining a GCM with transient tracers is thus fully practical.
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Constraining gravitational and cosmological parameters with astrophysical data
… data to shed light on fundamental physics by constraining parametrized theoretical cosmological and gravitational models. Gravitational parameters are those constants that parametrize possible departures from Einstein's general theory of relativity (GR). We develop a general framework to …
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Constraining the North Atlantic circulation with transient tracer observations
… between 4.5°S and 39.5°N of the North Atlantic. Constraining a GCM with transient tracers is thus fully practical. However, the large uncertainties in the time-varying boundary conditions of transient tracer concentrations, and in their interior distributions, renders the transient tracers …
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Constraining dark energy using real and mock galaxy surveys
In this thesis, we study how dark energy may be constrained by measurements of large-scale clustering in future galaxy surveys, and through the imprint of a time-varying large-scale potential on the CMB (the integrated Sachs-Wolfe effect). We use semi-analytical galaxy formation models implemented …
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Constraining the Magneto-Ionic Environment of Galactic Supernova Remnants
The Galactic Magnetic Field (GMF) plays a crucial role in the evolution of the Milky Way, influencing where stars can be born and supporting large-scale structures. Despite this, relatively little is known about the GMF, prompting many efforts to map and constrain the magnetic field strength and …
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Constraining chemical kinetics of uranium oxides in extreme environments
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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Constraining Stellar Evolution in Young Open Clusters with NGTS
Understanding stellar evolution is fundamental to astronomy, yet there remain significant gaps in our knowledge. Scientific progress requires testing our best explanations against observation, and open clusters act as key test sites for theories of stellar evolution. Observations of young open …
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Constraining the QSO luminosity function using gravitational lensing statistics
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 resolution QSO imagery can be used to constrain the QSO luminosity function. We …
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Constraining the Origin of Multiple Stellar Populations in Stellar Clusters
Globular clusters were among the first luminous objects to form in the Universe. They are dense collections of hundreds of thousands of stars. Globular cluster formation is a major unsolved problem in astrophysics. A new constraint on the problem came from the discovery of unexpected star-to-star …
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Constraining the kinetically dominated Universe: Bayesian methods and primordial cosmology
In this thesis a systematic approach is taken to the study of the generation of primordial perturbations from a nite amount of cosmic in ation. It is demonstrated how a pre-in ationary stage that is kinetically dominated causes features in the primordial power spectrum. These features can be …
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Constraining the Neutrino Flux for Oscillation Measurements at MicroBooNE and DUNE
… together will help to provide improvements in constraining the fluxes seen at MicroBooNE and DUNE.
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