Zobrazeno 1 - 10
of 12 968
pro vyhledávání: '"A, Koivisto"'
Autor:
Miranda-Valdez, Isaac Y., Niinistö, Aaro, Mäkinen, Tero, Lejon, Juha, Koivisto, Juha, Alava, Mikko J.
Mathematical modeling is a powerful tool in rheology, and we present pyRheo, an open-source package for Python designed to streamline the analysis of creep, stress relaxation, oscillation, and rotation tests. pyRheo contains a comprehensive selection
Externí odkaz:
http://arxiv.org/abs/2412.15941
The Euclidean path integral approach to quantum gravity is conventionally formulated in terms of the Einstein-Hilbert-York-Gibbons-Hawking action, which requires suitable subtractions to produce the correct black hole partition function. However, the
Externí odkaz:
http://arxiv.org/abs/2412.13946
A well-known result of Shalom says that lattices in SO$(n,1)$ are $L^p$ measure equivalent for all $p
Externí odkaz:
http://arxiv.org/abs/2411.10250
Autor:
Koivisto, Tomi S., Zheng, Luxi
Black hole solutions are explored in the Lorentz gauge theory of gravity. The fields of the theory are the gauge potential in the adjoint and a scalar in the fundamental representation of the Lorentz group, a metric tensor then emerging as a composit
Externí odkaz:
http://arxiv.org/abs/2408.10100
Autor:
Bello-Morales, Antonio G., Jiménez, Jose Beltrán, Cano, Alejandro Jiménez, Maroto, Antonio L., Koivisto, Tomi S.
Theories formulated in the arena of teleparallel geometries are generically plagued by ghost-like instabilities or other pathologies that are ultimately caused by the breaking of some symmetries. In this work, we construct a class of ghost-free theor
Externí odkaz:
http://arxiv.org/abs/2406.19355
Motivated by cosmological applications for interacting matters, an extension of the action functional for relativistic fluids is proposed to incorporate the physics of non-adiabatic processes and chemical reactions. The former are characterised by en
Externí odkaz:
http://arxiv.org/abs/2406.01412
Autor:
Iosifidis, Damianos, Koivisto, Tomi S.
We explore a new action formulation of hyperfluids, fluids with intrinsic hypermomentum. Brown's Lagrangian for a relativistic perfect fluid is generalised by incorporating the degrees of freedom encoded in the hypermomentum tensor, namely by includi
Externí odkaz:
http://arxiv.org/abs/2312.06780
A novel first order action principle has been proposed as the possible foundation for a more fundamental theory of General Relativity and the Standard Model. It is shown in this article that the proposal consistently incorporates gravity and matter f
Externí odkaz:
http://arxiv.org/abs/2311.07464
The intrinsic presence of ghosts in the symmetric teleparallel framework is elucidated. We illustrate our general arguments in $f(\mathbb{Q})$ theories by studying perturbations in the three inequivalent spatially flat cosmologies. Two of these branc
Externí odkaz:
http://arxiv.org/abs/2311.04201
Autor:
Angot, Julien, Tarvainen, Olli, Koivisto, Hannu, Luntinen, Miha, Thuillier, Thomas, Toivanen, Ville
The consecutive transients (CT) method is a diagnostics approach combining experimental and computational techniques to probe the plasma parameters of Charge Breeder Electron Cyclotron Resonance Ion Sources (CB-ECRIS). The method is based on short pu
Externí odkaz:
http://arxiv.org/abs/2310.11185