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Sam Bartrum
Researcher at University of Edinburgh
Publications - 6
Citations - 281
Sam Bartrum is an academic researcher from University of Edinburgh. The author has contributed to research in topics: Inflation (cosmology) & Warm inflation. The author has an hindex of 5, co-authored 6 publications receiving 250 citations.
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The importance of being warm (during inflation)
TL;DR: In this article, the amplitude of primordial curvature perturbations is enhanced when a radiation bath at a temperature T > H is sustained during inflation by dissipative particle production, which is particularly significant when a non-trivial statistical ensemble of inflaton fluctuations is also maintained.
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Fluctuation-dissipation dynamics of cosmological scalar fields
TL;DR: In this paper, the authors show that dissipative effects have a significant impact on the evolution of cosmological scalar fields, leading to friction, entropy production and field fluctuations.
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Warming up for Planck
TL;DR: In this article, it was shown that the presence of a thermal bath warmer than the Hubble scale during inflation decreases the tensor-to-scalar ratio with respect to the conventional prediction in supercooled inflation, yielding r < 8|nt|, where nt is a tensor spectral index.
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Gravitino cosmology in supersymmetric warm inflation
TL;DR: In this article, the authors study the evolution of the gravitino abundance during and after inflation for simple monomial potentials, taking into account the enhanced gravitinos and possibly gaugino masses due to supersymmetry breaking during inflation and the smooth transition into a radiation-dominated era.
Journal ArticleDOI
Warming up for Planck
TL;DR: In this paper, it was shown that the presence of a thermal bath warmer than the Hubble scale during inflation decreases the tensor-to-scalar ratio with respect to the conventional prediction in supercooled inflation, yielding $r < 8|n_t|, where n is the tensors spectral index.