Cosmology

Cosmology is the study of the large scale structure of the Universe, as well as its dynamics. Our group has been involved in the study and development of cosmological models, in particular to explain the accelerated phases of the cosmological evolution, dubbed inflationary phases.

For our latest developments/activities in this area, please see the listing below.


Latest Cosmology Publications

Black holes, gravitational waves and fundamental physics: a roadmap, L. Barack et al.,; arXiv:1806.05195 [gr-qc].

Publication type
Regular Articles
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Inflation with Planck: a survey of some "exotic" inflationary models, Cláudio Gomes, Orfeu Bertolami, João G. Rosa, Phys. Rev. D97, 104061 (2018); e-Print: arXiv:1803.08084 [hep-th].

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Regular Articles
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Scale-invariant scalar field dark matter through the Higgs portal, Catarina Cosme, João G. Rosa, Orfeu Bertolami, JHEP 1805, 129 (2018); e-Print: arXiv:1802.09434 [hep-ph].

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Regular Articles
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Electroweak phase transitions in multi-Higgs models: the case of Trinification-inspired THDSM, Thibault Vieu, António P. Morais, Roman Pasechnik; arXiv:1801.02670 [hep-ph].

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Regular Articles
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Adiabatic out-of-equilibrium solutions to the Boltzmann equation in warm inflation, Mar Bastero-Gil, Arjun Berera, Rudnei O. Ramos, João G. Rosa, JHEP 1802, 063 (2018)e-Print: arXiv:1711.09023 [hep-ph].

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Regular Articles
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Latest Cosmology News & Events

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.

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.

Is dark energy really constant?

Speaker
Tiago Barreiro (IA - Lisbon)
Event date
Venue
GAP room
Event type

One well known problem of the standard cosmological constant model is the tension between the high level of clustering observed in the CMB and the one obtained from large-scale structures. This may be an indication that the way  dark energy affects clustering might differ from a simple cosmological constant.

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.)