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pro vyhledávání: '"Simão, José Diogo"'
Autor:
Simão, José Diogo
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 hypersurface
Externí odkaz:
http://arxiv.org/abs/2405.01360
We study the semi-classical limit of the recently proposed coherent spin foam model for (2+1) Lorentzian quantum gravity. Specifically, we analyze the gluing equations derived from the stationary phase approximation of the vertex amplitude. Typically
Externí odkaz:
http://arxiv.org/abs/2404.16943
Autor:
Simão, José Diogo
We propose an explicit spin-foam amplitude for Lorentzian gravity in three dimensions. The model is based on two main requirements: that it should be structurally similar to its well-known Euclidean analog, and that geometricity should be recovered i
Externí odkaz:
http://arxiv.org/abs/2402.05993
Autor:
Simão, José Diogo
This work is developed in the context of Lorentzian spin-foams with space- and time-like boundaries. It is argued that the equations describing the semiclassical regime of the various spin-foam amplitudes admit a common biquaternionic structure. A co
Externí odkaz:
http://arxiv.org/abs/2401.10324
Numerical methods in spin-foam models have significantly advanced in the last few years, yet challenges remain in efficiently extracting results for amplitudes with many quantum degrees of freedom. In this paper we sketch a proposal for a ``hybrid al
Externí odkaz:
http://arxiv.org/abs/2206.13540
Publikováno v:
Phys. Rev. D 104, 126001 2021
In this article we study the Conrady-Hnybida extension of the Lorentzian Engle-Pereira-Rovelli-Livine spin-foam model, which admits time-like cells rather than just space-like ones. Our focus is on the asymptotic analysis of the model's vertex amplit
Externí odkaz:
http://arxiv.org/abs/2106.15635
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