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 12 of 12 for “"Planck scale"”.
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Physics on Noncommutative Spacetimes
<p>The structure of spacetime at the Planck scale remains a mystery to this date with a lot of insightful attempts to unravel this puzzle. One such attempt is the proposition of a `pointless' structure for spacetime at this scale. This is done by studying the geometry of the spacetime through a …
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Quantum Effects of Scalar Fields in Black Hole and Cosmological Spacetimes
… that of a spatially flat FRW metric in which the scale factor increases as a power-law with a divergence at some future time $t=t_{\text{rip}}$. Results of analytical and numerical computations of the expectation value of the stress tensor for massive and massless minimally and conformally coupled …
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Forces and gauge groups beyond the standard model
… the smallness of the Higgs mass compared to the Planck scale, but reconciling the measured value of 126 GeV with the absence of super-partners at colliders is difficult. By gauging various global symmetries of the Standard Model, I show that a variant of Higgsed gauge mediation called auxiliary …
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Neutrinos as Windows Into Physics Beyond the Standard Model
… predicted proton decay rate. Third, we consider Planck scale induced proton decay operators. We discuss to what extent the choice of unified gauge group can suppress these operators, and show that they can be sufficiently suppressed in E6, or trinified models. However, this implies an …
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The wave function of the universe
… is recovered over distances much larger than the Planck scale. A good notion of time is also essential for any quantum theory to predict the correct classical behaviour for the Universe today. The issue of time inevitably re-emerges throughout our work.
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A tale of two particles
… galaxy of darkness, it was the largest of cosmic scales, it was the smallest of Milky Way subhalos, we had multiple nonminimally coupled inflatons before us, we had inelastically selfinteracting dark matter before us, we were all going direct to the Planck scale, we were all going direct the other …
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The Measurement Problem within Quantum Mechanics on a Non-commutative Plane
… relativity and standard quantum mechanics at the Planck scale. Quantum mechanics on the non-commutative plane, characterized by the modified relation [ˆxi, ˆxj ] = iθεij , introduces a fundamental length scale that limits spatial resolution and embeds geometric uncertainty directly into the formal …
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Solvable Models on Noncommutative Spaces with Minimal Length Uncertainty Relations
… uncertainty relations suggest that at length scales close to the Planck length, strong gravity effects limit the spatial as well as temporal resolution smaller than fundamental length scale, leading to space-space as well as spacetime uncertainties. Space-time cannot be probed with a …
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E6 inspired supersymmetric models
… prediction of gauge coupling unification at the Planck scale rather than the conventional GUT scale, hinting at a potential unification of the Standard Model forces with quantum gravity.<br/><br/>If extended with a discrete non-Abelian family symmetry, the E6 inspired models can explain the …
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Some Numerical and Phenomenological Studies in Loop Quantum Cosmology
… spacetime curvature becomes comparable to the Planck scale. The presence of quantum bounce greatly modifies the dynamics of the early universe and can have important implications for observational signatures. Although the quantum bounce has been previously studied via numerical methods for …
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Production and evaporation of higher dimensional black holes
… a study of the theory and phenomenology of trans-Planckian black holes, in TeV gravity extra-dimensional theories. The introduction starts with the motivation for this beyond the Standard Model scenario (chapter 1), a summary of the theoretical tools to formulate the theory, and a summary of the …