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摘要：While the phenomenon of cosmic expansion is well-established, it is also possible that this expansion could engender a process of cosmic condensation. Indeed, in the presence of new physics beyond the Standard Model, the early universe could have undergone a change of state in a manner analogous to the condensation of water vapor into liquid. Such a first order phase transition, associated with the breaking of one or more symmetries, could hold the keys to explaining the cosmic matter-antimatter asymmetry, abundance of dark matter, and/or non-vanishing neutrino masses. I discuss recent theoretical progress in analyzing the possibilities for this condensing universe and their possible signatures in terrestrial and astrophysical experiments.
个人简介:Michael Ramsey-Musolf is a T.D. Lee Chair Professor at the Tsung-Dao Lee Institute/Shanghai Jiao Tong University and Professor of Physics at the University of Massachusetts Amherst. He received his Ph.D. from Princeton University in 1989. His thesis was awarded the American Physical Society (APS) Dissertation Award in Nuclear Physics. He subsequently completed a post-doc at M.I.T. before assuming faculty appointments at several institutions. His theoretical research lies at the interface of particle physics, nuclear physics, and cosmology, with contributions to studies of electroweak baryogenesis, electroweak phase transition, extended Higgs sectors, finite-temperature non-equilibrium quantum field theory, electroweak radiative corrections, tests of fundamental symmetries, neutrino properties, and hadron structure. An APS Fellow, he received the APS 2023 Herman Feshbach Prize in Theoretical Nuclear Physics. To date, he has mentored 70+ Ph.D. students and post-docs, many of whom have gone onto long term careers in basic research.