The shadow of a Black Hole (2019) and the problematc measurement of light defecton by the sun in 1919

LIP, Lisboa

Por Rui Agostinho (FCUL).

The Event Horizon Telescope (EHT) has published in 2019 the first ever image of an Event Horizon, from the very massive central black hole in the M87 galaxy. The team has chosen to publicize it 100 years after the first measurement of light deflection by a strong gravitacional field, which was a landmark for the Theory of Relativity in 1919. This new image did not require a technological revolution and neither did the images taken in 1919, however they all imprint the History of Physics.

The results on the change of stars’ positions around the sun, in the total solar eclipse in May 1919, as measured by the Dyson’s and Eddington’s teams in Sobral (Brasil) and the island of Principe (S. Tomé, Portuguese at the time), were both consistent with the newtonian mechanics as well as relativistic predictions, which gave some discomfort to the general acceptance of the final conclusion.

In this presentation I’ll give a general historical overview of the facts, but I’ll discuss the details on the measurement of the EHT image, the astrometry of the 1919 results, and how and why the old photographic plates were reanalyzed in order to confirme the relativistic effect.

LIP - Laboratório de Instrumentação e Física Experimental de Partículas

Speaker: Elvira Zappale (Università Degli Studi di Salerno).

Cancelamento motivado pela aplicação do plano de contingência da Faculdade de Ciências da Universidade de Lisboa, na sequência das orientações da Direção-Geral de Saúde e das recomendações por parte da Reitoria da Universidade de Lisboa, relativamente ao novo Coronavírus (CO

Apresentações de Andreia Figueiredo (Ciências ULisboa) e Paula Silva (ICBAS.UPorto / Science & Wine).

Speaker: Pavel Exner (Doppler Institute for Mathematical Physics and Applied Mathematics, Prague).

Candidaturas a decorrer até ao dia 15 de julho de 2020.

IN3+  | Um Milhão para a Inovação.

O prémio IN3+ destina-se a todos os investigadores pertencentes às entidades que integram a Rede Inovação INCM.

Cancelamento motivado pela aplicação do plano de contingência da Faculdade de Ciências da Universidade de Lisboa, na sequência das orientações da Direção-Geral de Saúde e das recomendações por parte da Reitoria da Universidade de Lisboa, relativamente ao novo Coronavírus (COVID-1

Speaker: Gonçalo Tabuada (FCTUNL).

New date: September 14th-16th, 2020.

Ciências ULisboa associa-se ao maior evento mundial sobre inovação para a sustentabilidade - “The Planetiers World Gathering” - que terá lugar no Altice Arena entre 21 e 23 de outubro de 2020, sob os auspícios da

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