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 7 of 7 for “"Primordial Gravitational Waves"”.
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Polarisierte Photon- und geflavourte Lepton-Quantenboltzmanngleichungen im frühen Universum
… of which the later can only be induced by primordial gravitational waves (tensor uctuations of the metric) at leading order. Nongaussiaity is not generated at rst order and is directly proportional to the primordial Nongaussianity of in ation. Thus B-mode polarisation and Nongaussianity …
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Probing the cosmological dynamics of a logarithmic f (R) theory of gravity
… that the BICEP2 results cannot be ascribed to a primordial gravitational waves. In fact, the recent dust map was released by Planck's team lowered the chances that the signal detected by BICEP2 team can be due to primordial gravitational waves. The second chapter introduces a review of the …
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High-Energy Aspects of Inflationary Cosmology
… observables: higher-order correlations of primordial density perturbations (non-Gaussianity) and primordial gravitational waves (tensor modes). In the first part of the thesis, we explore novel signatures of high-energy physics in higher- order correlation functions of inflationary …
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Cosmology from the CMB and Lyman-α forest
… for the optical depth to reionization (τ) or primordial gravitational waves, parametrised by the tensor-to-scalar ratio (r), from large-angular scale CMB data from the Planck satellite. The methods presented range from exact pixel-based likelihoods, maximum-entropy-based semi-analytic …
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CMB analysis with ACT and Planck
… measure the sum of neutrino masses, search for primordial gravitational waves, further exploit secondary anisotropies, and constrain extended models more generally. In this thesis I present a study of the CMB temperature and polarization anisotropies, their power spectra, and cosmological …
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Polishing the Lenses: Refined Modelling of Gravitational Lensing and Delensing of the Cosmic Microwave Background
… however, the photons' paths are deflected by the gravitational influence of the matter distribution of the Universe --- an effect known as `gravitational lensing'. Though the deflections are small, they can affect the statistical properties of the ensemble in crucial ways. Lensing converts part of …
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Probes of cosmic inflation: from the CMB to quantum analogues
… patterns, which are a distinctive imprint of primordial gravitational waves (PGW) on large scales. The Simons Observatory (SO), a new ground-based CMB experiment, is targeting these B-modes with unprecedented sensitivity. Realizing the full potential of this high-precision instrument requires …