High Energy Physics News & Events

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A super-nova remnant in Andromeda galaxy

Gr@v member Valério Ribeiro was part of an international team of researchers studying thermonuclear eruptions in the Andromeda galaxy. The team published, in Nature magazine, the discovery of a super-nova remnant which is bigger than most supernova remnants. They found that the super-nova remnant was the consequence of yearly repeated eruptions over millions of years. Few of these systems are known in the galaxy due to the fact that we suffer from dust obscuration.

Electroweak vacuum lifetime in two Higgs doublet models

Speaker
Pedro Ferreira (CFTC, University of Lisbon)
Event date
Venue
GAP room
Event type
The Two Higgs Doublet Model (2HDM) is an excellent candidate for physics Beyond the Standard Model, and it predicts the existence of extra scalar particles liable to be discovered in the coming years at the LHC. Unlike the Standard Model, however, the 2HDM scalar potential has a rich vacuum structure, with competing minima possible already at tree-level.

Dark side of the seesaw

Speaker
Ivo de Medeiros Varzielas (CFTP - IST Lisbon)
Event date
Venue
GAP room
Event type
I will explore the idea of connecting the dark matter sector with a sector of the Standard Model (SM), namely the neutrino sector. To do this, I consider the extension of the SM with right-handed (gauge singlet) neutrinos, which will lead to a type-I seesaw mechanism. Then I also add a fermion (another gauge singlet) dark matter candidate.

Greybody factors and quasinormal modes under scalar perturbations in two concrete exactly solvable models

Seminars 2018
Speaker
Grigorios Panotopoulos (CENTRA, IST-Lisbon)
Event date
Venue
Anf. Física
Ends on
Event type

Greybody factors are frequency dependent quantities that measure the deviation from the perfect black body spectrum of Hawking radiation, and they provide us with valuable information about the near horizon structure of black holes. In
addition, when black holes are perturbed the geometry of spacetime undergoes dumbed oscillations.