31 resultados para Horizon 2020
Filtro por publicador
- Aberdeen University (6)
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- Chinese Academy of Sciences Institutional Repositories Grid Portal (60)
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- Comissão Econômica para a América Latina e o Caribe (CEPAL) (11)
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- Corvinus Research Archive - The institutional repository for the Corvinus University of Budapest (3)
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- Digital Commons @ Center for the Blue Economy - Middlebury Institute of International Studies at Monterey (1)
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- Duke University (4)
- eResearch Archive - Queensland Department of Agriculture; Fisheries and Forestry (5)
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- Hospital Prof. Dr. Fernando Fonseca - Portugal (1)
- Indian Institute of Science - Bangalore - Índia (63)
- Instituto Nacional de Saúde de Portugal (2)
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- Instituto Politécnico do Porto, Portugal (1)
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- Massachusetts Institute of Technology (3)
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- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (13)
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- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (2)
- Savoirs UdeS : plateforme de diffusion de la production intellectuelle de l’Université de Sherbrooke - Canada (1)
- Scielo España (1)
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- Universidad de Alicante (4)
- Universidad del Rosario, Colombia (10)
- Universidad Politécnica de Madrid (5)
- Universidade de Lisboa - Repositório Aberto (2)
- Universidade Federal do Pará (1)
- Universidade Metodista de São Paulo (3)
- Universitätsbibliothek Kassel, Universität Kassel, Germany (1)
- Université de Montréal (2)
- Université de Montréal, Canada (6)
- University of Connecticut - USA (1)
- University of Michigan (19)
- University of Queensland eSpace - Australia (8)
- WestminsterResearch - UK (4)
Resumo:
We revisit the theory of null shells in general relativity, with a particular emphasis on null shells placed at horizons of black holes. We study in detail the considerable freedom that is available in the case that one solders two metrics together across null hypersurfaces (such as Killing horizons) for which the induced metric is invariant under translations along the null generators. In this case the group of soldering transformations turns out to be infinite dimensional, and these solderings create non-trivial horizon shells containing both massless matter and impulsive gravitational wave components. We also rephrase this result in the language of Carrollian symmetry groups. To illustrate this phenomenon we discuss in detail the example of shells on the horizon of the Schwarzschild black hole (with equal interior and exterior mass), uncovering a rich classical structure at the horizon and deriving an explicit expression for the general horizon shell energy-momentum tensor. In the special case of BMS-like soldering supertranslations we find a conserved shell-energy that is strikingly similar to the standard expression for asymptotic BMS supertranslation charges, suggesting a direct relation between the physical properties of these horizon shells and the recently proposed BMS supertranslation hair of a black hole.