BORIS Theses

BORIS Theses
Bern Open Repository and Information System

Rate observables for cosmology and heavy ion collision experiments

Jackson, Gregory Scott (2020). Rate observables for cosmology and heavy ion collision experiments. (Thesis). Universität Bern, Bern

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The early universe is perhaps the best conceivable multi-particle system in nature, for which the degrees of freedom are those of the Standard Model. This elementary particle plasma traced a path through its phase diagram, while evolving, that was largely determined by the underlying symmetries of the theory. Another trajectory, through the same phase diagram, is followed in a central collision between two heavy nuclei at high energies. Fortunately, theoretical methods developed and tested for heavy ion collision experiments are also proving useful in cosmology, and vice versa . We demonstrate this by giving context to (and summarising) the work in Refs. [1, 2, 3, 4, 5]. Important properties can be studied through the `eyes' of different probes that escape a thermal medium. In this thesis we consider three: Photons, neutrinos and gravitational waves. Each of these signals is a forensic tool for one or another facet of the Standard Model at finite temperature. Among the dynamical observables, interaction rates for hot gauge theories are conceptually interesting in their own right because they are sensitive to many scales in the problem. It is therefore crucial to evaluate the predictive power of perturbative approximations, either by examining higher-order terms or by comparing them with non-perturbative information. Keywords: perturbation theory, interaction rate, quark-gluon plasma, electroweak phase transition, gravitational radiation, hydrodynamics. References [1] G. Jackson and M. Laine Eur. Phys. J. C78 (Apr, 2018) 304, arXiv:1803.01871 [hep-ph]. [2] G. Jackson Phys. Rev. D100 no. 11, (2019) 116019, arXiv:1910.07552 [hep-ph]. [3] G. Jackson and M. Laine JHEP 11 (2019) 144, arXiv:1910.09567 [hep-ph]. [4] G. Jackson and M. Laine Nucl. Phys. B950 (2020) 114870, arXiv:1910.12880 [hep-ph]. [5] J. Ghiglieri, G. Jackson, M. Laine, and Y. Zhu JHEP 07 (2020) 092, arXiv:2004.11392 [hep-ph].

Item Type: Thesis
Dissertation Type: Single
Date of Defense: 16 July 2020
Subjects: 500 Science > 530 Physics
Institute / Center: 08 Faculty of Science > Institute of Theoretical Physics
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
Depositing User: Hammer Igor
Date Deposited: 04 Sep 2020 09:25
Last Modified: 16 Jul 2021 00:30

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