At GR22
Current and former Gr@v members met at the 22nd International Conference on General Relativity and Gravitation (GR22) in Valencia, Spain. Great talks and great discussions!
Cosmology News & Events
Complementarity between gravitational waves and collider probes in extended Higgs sectors
Speaker
Maria Ramos (LIP - U. Minho)
Event date
Venue
GAP room
Event type
An extended scalar sector often emerges in models motivated by the electroweak hierarchy problem. In particular, a SM triplet is interesting because its decay is very constrained at the renormalizable level. Therefore, effective operators with a low cutoff make the triplet components decay promptly.
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.
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.
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.
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.
Upon a vintage conjecture
Speaker
Paulo Moniz (U. Beira Interior)
Event date
Venue
GAP room
Event type
The reduced phase space quantization of a closed Friedmann Universe is described. Its matter content is constituted by a specific perfect fluid. It is shown that, for this particular model, specific boundary conditions can be related to the algebra of Dirac observables.
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.
Visit of Kunihito Uzawa
Professor Kunihito Uzawa from Kwansei Gakuin University, Japan, visited Gr@v in the last week of September 2018 and gave a seminar on "No-Go theorems for ekpyrosis from ten-dimensional supergravity". (In the photo with Eugen Radu.)
No-Go theorems for ekpyrosis from ten-dimensional supergravity
Speaker
Kunihito Uzawa, Kwansei Gakuin University, Japan
Event date
Venue
room 32.1.3 CICFANO
Ends on
Event type
Abstract: In this talk, we present whether the new ekpyrotic scenario
can be embedded into ten-dimensional supergravity. We use that the
scalar potential obtained from flux compactifications of type II
supergravity with sources has a universal scaling with respect to the