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 82 for “"big bang"”.
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Precision frontiers of big bang nucleosynthesis
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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The Influence of Matter-Antimatter Domains on Big Bang Nucleosynthesis
… Primordialen Nukleosynthese — oder auch Big Bang Nukleosynthese (BBN) — werden die relativen Haeufigkeiten der einzelnen Kerne abhangig von den genauen physikalischen Bedingungen im jungen Universum vorhergesagt. Die im Rahmen des Standardmodells der Kosmologie vorhergesagten …
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big bang, a novel regulator of tissue growth in Drosophila melanogaster
… identified in this screen is a gene called big bang (bbg). The absence of bbg results in smaller wings with a slower cell cycle and increased apoptosis in wing discs. bbg encodes a protein expressed in the apical cortex in wing disc cells and is required for the proper localization of apical …
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Dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang nucleosynthesis
… transitions, primordial magnetic fields, and Big Bang Nucleosynthesis. In particular, (1) I have derived the effects of magnetic fields on nucleon and particle reaction rates of astrophysical significance. The sensitivity to the presence of arbitrary degeneracy and polarization has also been …
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China’s Escape from the “Big Bang”: The 1980s Price Reform Debate in Historical Perspective
… from a command economy. Russia applied a ‘big-bang’ doctrine with rapid price liberalisation at its core. In contrast, a policy of experimentalist gradualism manifested in the dual track price system (DTPS) laid the foundations for China’s economic success. But the Chinese reform approach …
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From Black Holes to the Big Bang: Astrophysics and Cosmology with Gravitational Waves and their Electromagnetic Counterparts
The growing catalog of gravitational-wave signals from compact object mergers has allowed us to study the properties of black holes and neutron stars more precisely than ever before and has opened a new window through which to probe the earliest moments in our universe’s history. Population-level …
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Indirect 2H(d,p)3H and 2H(d,n)3He fusion reactions measurement at energies relevant for Big Bang Nucleosynthesis
… burning channels 2H(d,p)3H and 2H(d,n)3He in the Big Bang Nucleosynthesis (BBN) astrophysical scenario. In the beginning is presented this phase of the early universe and why the BBN model is still fine tuned with new results coming from observations and laboratory measurements. This model (if BBN …
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A Big Bang Big Crunch Type-2 Fuzzy Logic System for Machine Vision-Based Event Detection and Summarization in Real-world Ambient Assisted Living
… Logic based Systems (IT2FLSs) ) generated by the Big Bang Big Crunch (BB-BC) algorithm for the real time automatic detection and summarization of important events and human behaviour. I will present several real world experiments which were conducted for AAL related behaviour with various users. …
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Preheating in new Higgs inflation
… a rapid, exponential expansion right after the Big Bang. Inflation solves the so-called "horizon problem," "flatness problem," and "monopole problem" of standard Big Bang cosmology. Furthermore, New Inflation solves the "graceful exit problem" of the original theory. In inflation, the energy …
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Ricci Time in Lemaître-Tolman Model and Block Universe
… the timelike Ricci eigenlines, starting from the big bang. The main idea of this work is to investigate the shape of the {Ƭ=constant} surfaces relative to the the null surfaces, and determine what makes these surfaces timelike or spacelike. We use the Lemaître-Tolman metric as our inhomogeneous …
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Density perturbations in hybrid inflation
Inflation is a substantial modification to the big bang theory, and supernatural inflation is a hybrid inflation motivated from supersymmetry. In this thesis we carry out a one dimensional numerical simulation to verify the untested analytic approximation of Radall et al. The results show a good …
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Jewish Identity on American Television and Viewer Attitudes in an Era of Rising Anti-Semitism
… characters as part of the main cast – <em>The Big Bang Theory</em> and <em>Will & Grace</em> – also have Jewish producers/showrunners with creative control over these programs. Their definitions of Jewish identity become some of the images that audiences see, which potentially contribute to …
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Topics in Cosmic Acceleration and Braneworlds
… to solve many problems with the standard Hot Big Bang cosmology. In the late universe, cosmic acceleration seems to best explain a wide variety of observations. In both cases, we lack a complete theory of what drives cosmic acceleration. In this thesis I discuss some open issues in our …
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Higgs-Portal and Z'-Portal Dark Matters in Brane-World Cosmologies
… cosmologies. These models reproduce the standard Big Bang cosmology at temperatures below the so-called "transition temperature." However, at higher temperatures, they introduce significant modifications to the universe's expansion dynamics. This non-standard expansion law directly influences the …
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Applications of particle physics to the early universe
… theory of Baryogenesis, of Dark Matter, and of Big Bang Nucleosynthesis. The analysis of the data of the experiment WMAP on the CMB for the search of a non-Gaussian signal is also presented and it results in an upper limit on the amount on non-Gaussianities which is at present the most precise …
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Multifield inflation and differential geometry
… one or several quantum fields, shortly after the Big Bang. Renormalization requires the fields be non-minimally coupled to gravity. We examine such multifield models and find a rich geometric structure. After a conformal transformation of spacetime, the target field-space acquires non-trivial …
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Detecting the invisible universe with neutrinos and dark matter
… formed from cosmic relic neutrinos from the Big Bang, and directional detection of cold dark matter. The cosmic neutrino background is investigated through the KATRIN experiment, using neutrino capture on tritium to search for a signal. A sensitivity at KATRIN of about 10⁴ events per year, or …
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The Muon Detection System and W Z --> 3l̳(e̳, [mu]) cross section measurement at CMS
… energy scales that existed picoseconds after the Big Bang. Monte Carlo samples of many Standard Model processes are produced to simulate the conditions in the Compact Muon Solenoid detector. Data analysis techniques are developed to measure the cross section of the W Z --> 3l(e, [mu]) decay …
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