Zobrazeno 1 - 10
of 280
pro vyhledávání: '"P, Pidal"'
Autor:
Gielen, Steffen, Menéndez-Pidal, Lucía
We study the quantum dynamics of an interior planar AdS (anti-de Sitter) black hole, requiring unitarity in the natural time coordinate conjugate to the cosmological "constant of motion" appearing in unimodular gravity. Both the classical singularity
Externí odkaz:
http://arxiv.org/abs/2409.03006
Publikováno v:
J. High Energ. Phys. 2024, 193 (2024)
Assuming that Quantum Mechanics is universal and that it can be applied over all scales, then the Universe is allowed to be in a quantum superposition of states, where each of them can correspond to a different space-time geometry. How can one then d
Externí odkaz:
http://arxiv.org/abs/2401.08269
Autor:
Menéndez-Pidal, Lucía
This thesis contains an analysis of the problem of time in quantum cosmology and its application to a cosmological minisuperspace model. In the first part, we introduce the problem of time and the theoretical foundations. In the second part, we focus
Externí odkaz:
http://arxiv.org/abs/2211.09173
Autor:
Gielen, Steffen, Menéndez-Pidal, Lucía
Publikováno v:
Int.J.Mod.Phys.D 31 (2022) 14, 2241005
We explore the consequences of requiring that quantum theories of gravity be unitary, mostly focusing on simple cosmological models to illustrate the main points. We show that unitarity for a clock that encounters a classical singularity at finite ti
Externí odkaz:
http://arxiv.org/abs/2205.15387
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 2, Pp 1-17 (2024)
Abstract Assuming that Quantum Mechanics is universal and that it can be applied over all scales, then the Universe is allowed to be in a quantum superposition of states, where each of them can correspond to a different space-time geometry. How can o
Externí odkaz:
https://doaj.org/article/eb0ac1051de845e4bd6ed4a35e2d6192
Autor:
Gielen, Steffen, Menéndez-Pidal, Lucía
Publikováno v:
Class. Quantum Grav. 39 (2022), 075011
We continue our analysis of a quantum cosmology model describing a flat Friedmann--Lema\^itre--Robertson--Walker universe filled with a (free) massless scalar field and an arbitrary perfect fluid. For positive energy density in the scalar and fluid,
Externí odkaz:
http://arxiv.org/abs/2109.02660
Autor:
Gielen, Steffen, Menéndez-Pidal, Lucía
Publikováno v:
Class. Quantum Grav. 37 (2020) 205018
We study the quantum cosmology of a flat Friedmann-Lema\^{i}tre-Robertson-Walker universe filled with a (free) massless scalar field and a perfect fluid that represents radiation or a cosmological constant whose value is not fixed by the action, as i
Externí odkaz:
http://arxiv.org/abs/2005.05357
Akademický článek
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Akademický článek
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Publikováno v:
Revista Portuguesa de Nefrologia e Hipertensão, Vol 37, Iss 2, Pp 112-115 (2023)
Waldenstrom’s macroglobulinemia (WM) is an IgM associated lymphoplasmacytic lymphoma and kidney disease is a rare complication. We report a case of a 41-year-old male with a history of WM diagnosed 16 years ago, currently with no indication for tr
Externí odkaz:
https://doaj.org/article/72bbad70bb634ddeafed2cb83163bf08