Friday, May 29, 2015

We’ve had a full week. Emanuele Berti and Hector Okada are staying with us for some months, Muzi is leaving this Friday to South Africa and Norihiro Tanahashi just delivered a seminar on Shock formation in Lovelock theories. This called for a celebration, so we went to Pateo 13 in Alfama.

Neutron stars may become a ground-breaking space laboratory for fundamental physics

Tuesday, April 8, 2014

The bended spacetime around a neutron star shows universal geometric
features, similar to the monoliths from the novel “2001: A Space Odyssey.”
Illustration by Louis (Iwa) Le Brun.

In the famous novel “2001: A Space Odyssey” the most intriguing protagonists are the Monoliths. They appeared with different sizes, but with one common feature: the ratio of their edges’ length being 1 to 4 to 9. Last year it was reported in Science that neutron stars have something in common with these Monoliths. While the structure of these stars is mysterious and they come in different sizes, a remarkable geometrical universality leaps to the eye: certain parameters describing the spacetime around neutron stars are related in a universal manner, approximately independent of the various proposed models for the stellar structure. The Science article has been widely debated as to which extent these relations are applicable in real neutron stars. In a paper recently accepted in Physical Review Letter, researchers from CENTRA’s gravity group demonstrate that universal relations between these parameters can be formulated for arbitrary fast rotating neutron stars. These results consolidate that the universality can become a powerful tool for observations of neutron stars in the future. Like the Monoliths stimulated the inventive spirit of the first men, we hope that the study of neutron stars will lead to new ideas about gravitation and the three other fundamental forces. Neutron stars may become the future ground-breaking space laboratories.

Workshop on the “The Strong Gravity Regime of Black Holes and Neutron Stars”

Wednesday, April 2, 2014

Vitor and Richard at the 558. WE-Heraeus-Seminar on “The Strong Gravity Regime of Black Holes and Neutron Stars”, held in Bad Honnef. Vitor was one of the plenary speakers while Richard was awarded a prize for his poster. You can see the programme and talks here

Programa de Estímulo à Investigação 2013

Thursday, March 6, 2014

The ceremony for the “Programa de Estímulo à Investigação 2013” prizes took place on the 26th February, 2014. Richard was one of the 8 researchers awarded this year.

Ryuichi and Vitor in Belém

Ryuichi and Vitor visited UFPA, and talked about “Post-Newtonian expansion of gravitational waves from a test particle in circular orbits around a Kerr black hole” and “Fundamental Fields in Strong Gravity”.