Seminário

Non-exotic modified gravity wormholes and closed timelike curves

Sala 1.4.14, Ciências ULisboa

Por Francisco Lobo (Instituto de Astrofísica e Ciências do Espaço, FCUL).

The flaring-out condition at a wormhole's throat, which in general relativity violates the null energy condition, is a key feature in wormhole physics. This study explores modified gravity, where the matter at the throat satisfies the energy conditions, and we show that these non-trivial geometries are sustained by higher-order curvature effects acting as a gravitational fluid. These geometries may generate closed timelike curves, challenging causality. As causality is fundamental to physical theories, the potential for time travel and its paradoxes requires careful examination, which this presentation will explore in some detail.

Short bio: Francisco Lobo is a researcher at the Institute of Astrophysics and Space Sciences (IA) and Professor with Habilitation at the Department of Physics of the Faculty of Sciences of the University of Lisbon (FCUL). He is a member of the Euclid and LISA missions. He has published over 200 articles in high-impact international scientific journals, in the research areas of cosmology and gravitation.

Cartaz do evento

14h00-15h00
Departamento de Física | Ciências ULisboa

This workshop aims to explore crucial issues raised by contemporary computational models and methods in AI. The focus will be on fostering discussions about the epistemological, ontological, and formal considerations, as well as the societal implications of AI systems.

Logótipos de Ciências ULisboa/GAPsi e calendarização das palestras

Palestra promovida pelo GAPSI - Gabinete de Apoio Psicológico de Ciências ULisboa.

Seminário Doutoral II (Doutoramento em História e Filosofia das Ciências), por André Gonçalo Azevedo Pedro.

Título/data/local do evento e três fotografias relacionadas com a permacultura

Permacultura? Não é uma pseudociência esotérica? Uma utopia sem fundamento científico? Para desmistificar estas e outras ideias, o permacultor certificado Tiago Silva (SmartLeap) guiar-te-á pelos caminhos desta prática multidisciplinar, fundada em sólidas bases empíricas.

Logótipos de Ciências ULisboa/GAPsi e calendarização das palestras

Uma conversa sobre ti, alguém amigo ou apenas acerca de ansiedade.

An annual meeting that aims to bring together Evolutionary Biologists working in Portugal and abroad in order to promote scientific cohesion and excellence. This meeting is a forum for scientists of all academic levels (from master students to principal investigators), to present their work and discuss, fostering new ideas and collaborations.

A leading venue for presenting and discussing the latest research, industrial practice and innovations in dependable and secure computing.

Páginas