Warm Little Inflaton becomes Cold Dark Matter in Physical Review Letters
The article Warm Little Inflaton becomes Cold Dark Matter, by Gr@v members João G. Rosa and Luís B. Ventura has been published in Physical Review Letters.
High Energy Physics News & Events
The Higgs and cosmology
Speaker
Oleg Lebedev (Helsinki U.)
Event date
Venue
GAP room
Event type
I'll discuss the role of the Higgs boson as a probe of the hidden sector. The latter is of particular importance in cosmology as it may host dark matter and the inflaton. Due to its scalar nature, the Higgs boson provides a unique handle on properties of such Standard Model--singlet states.
First image of a black hole
Gr@v warmly congratulates the Event Horizon Telescope collaboration for the first direct image of a black hole. This discovery has had a worldwide impact, including news coverage in Portugal with the contribution of Gr@v and former Gr@v members.
Probing axions through the effective number of degrees of freedom
Speaker
Ricardo Zambujal Ferreira (NORDITA)
Event date
Venue
GAP room
Event type
Axions can play very important roles in cosmology. They are interesting candidates for dark matter, dark energy, inflation but also, in the case of the QCD axion, a natural solution to the strong CP problem.
Black hole spontaneous scalarisation - dynamical features
In a recent paper "Spontaneous scalarisation of charged black holes: coupling dependence and dynamical features", [arXiv:1902.05079], by Gr@v members A. Pombo and E. Radu, in collaboration with a group at IST-Lisbon (P. Fernandes, C. Herdeiro and N. Sanchis-Gual), fully non-linear evolutions of the process of spontaneous scalarisation of charged black holes.
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.
Interview to Porto Canal
João Rosa was interviewed for Porto Canal's "Mentes que brilham" about his work on stimulated axion decay around primordial black holes as a possible origin for fast radio bursts, recently published in Physical Review Letters. He also gave a related interview to the radio programme "Click" on Antena 1.
COST Action CA16104 Presentation Movie (v2.0)
Watch the presentation movie of the COST Action CA16104 Gravitational waves, black holes and fundamental physics (GWverse), in which Gr@v is involved as part of the core group.
The movie was created at the University of Aveiro (Portugal), written and directed by Carlos Herdeiro, with Design and Graphics by Joana Reis and Ana Sousa and Edited by Pedro Henriques.