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Doctoral thesis . 2018
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Desigualdades geométricas para objetos en relatividad general

Authors: Anglada, Pablo Rubén;

Desigualdades geométricas para objetos en relatividad general

Abstract

En este trabajo presentamos demostraciones formales de desigualdades geométricas relacionando la carga, la masa, el momento angular y el tamaño para objetos compactos, tanto para objetos ordinarios, como una estrella de neutrones, como para agujeros negros. Comenzamos estudiando un problema simple: la relación entre carga y tamaño en simetría esférica. Probamos que si tomamos un dato inicial que contiene un objeto ordinario cargado, dos veces el radio de área del objeto es siempre mayor estricto que la carga del mismo, y además que esta desigualdad es ajustada. Luego estudiamos la relación entre masa, momento angular y tamaño en simetría axial para objetos ordinarios. Obtenemos una cota inferior para la masa ADM en términos del momento angular y el tamaño del objeto. Además presentamos ejemplos numéricos que testan cuán robustas son las hipótesis que utilizamos y el resultado que obtenemos.

We present in this work formal demonstrations of geometrical inequalities relating the charge, the mass, the angular momentum and the size of compact objects, both for ordinary objects like a neutron star and for black holes. We star studying a simple case: the relatión between charge and size in spherical symmetry. We prove that prove that for an spherically symmetric charged body two times the radius is always strictly greater than the charge of the body. Also we prove that this inequality is sharp. Then we study the relation between mass, angular momentum and size in axial symmetry for ordinary objects. We obtain a lower bound for the ADM mass, in terms of the angular momentum and the size of the object. We also compute numerical examples to test the robustness of our hypotheses and results.

Fil: Anglada, Pablo Rubén. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.

Tesis (Doctor en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación, 2018.

Country
Argentina
Keywords

Flujo de curvatura media inversa, Momento angular, Desigualdad de Penrose, Carga, Classical general relativity, Momento Angular, Riemannian geometries, Classical electromagnetism, https://purl.org/becyt/ford/1.3, Relatividad general clásica, Penrose inequality, Desigualdades geométricas para objetos, Desigualdades Geometricas para Objetos, https://purl.org/becyt/ford/1

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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