Tootfinder

Foam: A Python package for forward asteroseismic modelling of gravity modes
Mathias Michielsen
https://arxiv.org/abs/2406.06692 https://

Foam: A Python package for forward asteroseismic modelling of gravity modes
Asteroseismology, the study of stellar pulsations, offers insights into the internal structures and evolution of stars. Analysing the variations in a star's brightness allows the determination of fundamental properties such as mass, radius, age, and chemical composition. Asteroseismology heavily relies on computational tools, but a significant number of them are closed-source, thus inaccessible to the broader astronomic community. This manuscript presents Foam, a Python package designed to perf…

Foundational Issues in Group Field Theory
\'Alvaro Mozota Frauca
https://arxiv.org/abs/2406.08501 https://arxiv.org/pdf/2406.0850…

Foundational Issues in Group Field Theory
In this paper I offer an introduction to group field theory (GFT) and to some of the issues affecting the foundations of this approach to quantum gravity. I first introduce covariant GFT as the theory that one obtains by interpreting the amplitudes of certain spin foam models as Feynman amplitudes in a perturbative expansion. However, I argue that it is unclear that this definition of GFTs amounts to something beyond a computational rule for finding these transition amplitudes and that GFT does…

This https://arxiv.org/abs/2405.01360 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Investigations on Lorentzian Spin-foams and Semiclassical Space-times
This thesis is developed in the context of the spin-foam approach to quantum gravity; all results are concerned with the Lorentzian theory and with semiclassical methods. A correspondence is given between Majorana 2-spinors and time-like hypersurfaces in Minkowski 3-space based on complexified quaternions. It is shown that the former suggest a symplectic structure on the spinor phase space which, together with an area-matching constraint, yields a symplectomorphism to $T^*\mathrm{SU}(1,1)$. A c…