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 9 of 9 for “"String models"”.
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The landscape of free fermionic gauge models.
… class of weakly coupled free fermionic heterotic string models, dubbed gauge models. In their purest form, these models are maximally supersymmetric (N = 4), and thus only contain superpartners in their matter sector. This feature makes their systematic construction particularly efficient, and …
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Initial systematic investigations of the weakly coupled free fermionic heterotic string landscape statistics.
… explicit purpose of systematically generating string models using the Weakly Coupled Free Fermionic Heterotic String (WCFFHS) method. The software, optimized for speed, generality, and ease of use, has been used to conduct preliminary systematic investigations of WCFFHS vacua. Documentation for …
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Inflationary cosmology and fundamental physics
… that are directly related to inflation: axions, string theory, and non-minimally coupled fields. In particular, we constrain the allowed parameter space of inflationary axion cosmology, identifying a classic window and an anthropic window; we discuss inflation in string theory, proving a no-go …
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Physics beyond the standard model: moduli stabilisation and neutrino physics
We look at models of neutrino mass and mixing which represent an important aspect of physics beyond the Standard Model (SM). We derive approximate analytic formulae for the neutrino mixing angles in general SD involving NLO and NNLO corrections. These expressions, which are given in terms of input …
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Études in Ambitwistor Strings - Exploring new models, higher loops and curved backgrounds
… equations, CHY formalism and the ambitwistor string. We discuss one of the striking simplifications that occur upon restricting to four spacetime dimensions, namely that the scattering equations with $n$ particles decompose into sectors, graded by an integer $1 \leq d \leq n-3$. It is a …
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Exploring the String Landscape: The Dynamics, Statistics, and Cosmology of Parallel Worlds
… various facets of the low-energy solutions in string theory known as the string landscape. Three separate questions are addressed - the tunneling dynamics between these vacua, the statistics of their location in moduli space, and the potential realization of slow-roll inflation in the flux …
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Brane cosmology in string/M-theory and cosmological parameters estimation.
… the late cosmic acceleration of the universe in string/M theory. In Part I, after developing two highly successful numerical codes, I apply them to study the holographical dark energy model and LCMD model with curvature. By fitting these models with the most recent observations, I find various …
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Probabilistic arithmetic automata : applications of a stochastic computational framework in biological sequence analysis
… sequences, such as DNA and proteins, as strings allows their investigation under a generative random string model. That is to say, one can define a probabilistic null model that generates random strings as representatives of a class of sequences. From these, one can deduce general …