The speaker starts with a gentle introduction to the spectral approach to (noncommutative) geometry. He and his team insist on the presence of fermions, so that a central role is played by a Dirac operator, acting on a one-particle Hilbert space. The combination with a coordinate algebra then allows for a full reconstruction of the spacetime geometry from the spectral data. Moreover, when allowing for noncommutative spaces described by an algebra of matrix-valued coordinates, the Dirac operator gets minimally coupled to a gauge field, as well as to the Higgs field.
The dynamics of all of these fields will emerge from the second quantization of the system. After a careful exposition of the latter procedure in the present context, they will analyze the information theoretic von Neumann entropy of the unique equilibrium state. they show that this entropy is given by the spectral action for a specific universal function. In the case of a curved spacetime manifold one finds that there is an asymptotic expansion of this entropy yielding the Einstein-Hilbert action, plus higher-order gravitational terms. Finally, in the presence of gauge and Higgs fields, the very same procedure yields additionally the Yang-Mills action functional and the scalar terms describing a Higgs mechanism.
時間：2023.11.14(二) 20:30~21:30
頻道：Zoom ID:421-480-1692 ← cosmology
講者：W.D. van Suijlekom (Radboud Universiteit Nijmegen*)
語言：英語
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【此屬轉載信息，以主事單位發布為準】
*Radboud University Nijmegen, Netherlands
“Copernicus Webinar and Colloquium Series”: To promote scientific discussions during this pandemic, they are organizing an online seminar series, i.e. Copernicus Webinar Series, seeking the most outstanding speakers to introduce innovative ideas and important progress in the field of gravity and cosmology. This series is named after the famous Polish Astronomer, Nicolaus Copernicus, whose discovery eventually marked the dawn of modern science.
歐洲核子研究組織CERN
此活動由歐洲核子研究組織CERN主辦。
