Cosmology News & Events

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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
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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

"Nullius in Verba"

The University of Aveiro and Gr@v join the many worldwide tributes to the life and work of Stephen Hawking. As a small contribution, the U. Aveiro asked Gr@v member C. Herdeiro to write an article for its online news that can be found here. A video statement can be found here (both in Portuguese).

Is dark energy really constant?

Speaker
Tiago Barreiro
Event date
Venue
room 32.3.30 CICFANO
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.

Successful SKA-day national event!

"SKA days PT" took place last 6 and 7 of February, at Covilhã and Lisbon, an initiative to promote the Square Kilometer Array (SKA) - the world's largest radio telescope - among the Portuguese scientific and business communities.

SKA project has the participation of 19 countries, in the case of Portugal it is via the infrastructure ENGAGE SKA, which is a consortium composed by the Instituto de Telecomunicações, the Universities of Aveiro (Gr@v), Porto and Évora, and the Polytechnic Institute of Beja.

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
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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.