Cosmology News & Events
3-form Cosmology
Speaker
Nelson Nunes (CAUL, Lisbon U.)
Event date
Venue
GAP room
Event type
Abstract: Three-forms can give rise to viable cosmological scenarios of inflation and dark energy with potentially observable signatures distinct from standard single scalar field models. When applied to inflation, a three-form can provide a scale invariant scalar perturbations power spectrum and I will discuss the effect on primordial non-gaussianity. Finally I will discuss a
Thomas Metcalf visits Gr@v
Thomas Metcalf, a graduate student from the University of Edinburgh, is visiting our group from October to December 2013. Thomas is currently working with João Rosa in particle physics and cosmological models of warm inflation.
Phase-Space Noncommutative quantum mechanics, quantum cosmology and black holes
Speaker
Orfeu Bertolami (Porto U.)
Event date
Venue
GAP room
Event type
Abstract: We discuss the main features of a phase-space noncommutative model of quantum mechanics and its applications for quantum cosmology and black holes in the context of the Kantowski-Sachs minisuperspace geometry.
Introduction to Cosmology
Speaker
João Rosa
Event date
Venue
GAP room
Ends on
Event type
This is an introductory course in Cosmology, aimed primarily at Masters and PhD students but open to anyone who would like to know more about the Universe. It will focus mainly on describing the Hot Big Bang paradigm, its mathematical properties and the observational basis on which it stands. The course will be mostly self-contained but some parts of the course will require a basic knowledge of general relativity, quantum field theory and thermodynamics, although the main concepts will be revised.
From the dark ages to dark energy: Cosmology with the next generation of radio telescopesSlides
Speaker
Mário Santos (Instituto Superior Técnico - CENTRA)
Event date
Venue
GAP room
Event type
Abstract: A new generation of radio telescopes with unprecedented capabilities for astronomy and fundamental physics will be in operation over the next few years. I will address some of the possibilities for Cosmology offered by this new generation of telescopes, such as ASKAP, MeerKAT, LOFAR and the future SKA.
QFT on Quantum Bianchi I Space-time
Speaker
Yaser Tavakoli (Univ. da Beira Interior)
Event date
Venue
GAP room
Event type
Abstract: In this talk we discuss the quantum theory of a scalar field on LQC Bianchi I geometry. By focusing on single modes of the scalar field, we show that, evolution of the quantum field on the background quantum space-time leads to a classical effective geometry emerging whose components depend on the quantum geometrical operators.
Eddington-inspired Born-Infeld gravity: astrophysical and cosmological consequences
Speaker
Pedro Avelino (Porto U.)
Event date
Venue
GAP room
Event type
Abstract: The Eddington-inspired Born-Infeld (EiBI) theory of gravity has many attractive features. In particular, it may lead to a non- singular description of the Universe and it may accommodate compact stars made of pressureless dust.
Warm inflation in beyond the Standard Model scenarios
Speaker
Joao Rosa (U. Edinburgh)
Event date
Venue
GAP room
Event type
Abstract: Warm inflation provides an attractive solution to the so-called eta-problem that generically plagues supergravity and string theory models, with additional dissipation damping the inflaton's motion and simultaneously producing radiation during inflation.
n-DBI gravity
Speaker
Yuki Sato (Nagoya and Niels Bohr Institute)
Event date
Venue
GAP room
Event type
Abstract: n-DBI gravity is a gravitational theory introduced in arXiv:1109.1468[hep-th], motivated by Dirac-Born-Infeld type conformal scalar theory and designed to yield non-eternal inflation spontaneously. I explain that any solution of Einstein gravity with a particular curvature property is a solution of n-DBI gravity.