Cosmology News & Events

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Curvature perturbation in multi-field inflation models with non-minimal coupling

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Speaker
Masato Minamitsuji (IST, Lisbon)
Event date
Venue
GAP room
Event type
Seminars

Abstract: Recent observations of the Cosmic Microwave Background (CMB) show very good consistency with an inflationary model with non-minimal coupling between the scalar and the inflaton field. Such a model is well motivated in the context of the unified theory, which also predicts the existence of many other scalar fields  in addition to the inflaton.

Cosmology

3-form Cosmology

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Speaker
Nelson Nunes (CAUL, Lisbon U.)
Event date
Venue
GAP room
Event type
Seminars

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

Cosmology

Thomas Metcalf visits Gr@v

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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.

Cosmology

Introduction to Cosmology

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Speaker
João Rosa
Event date
Venue
GAP room
Ends on
Event type
Courses
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.
Cosmology

From the dark ages to dark energy: Cosmology with the next generation of radio telescopesSlides

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Speaker
Mário Santos (Instituto Superior Técnico - CENTRA)
Event date
Venue
GAP room
Event type
Seminars

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.

Cosmology

QFT on Quantum Bianchi I Space-time

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Speaker
Yaser Tavakoli (Univ. da Beira Interior)
Event date
Venue
GAP room
Event type
Seminars

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.

Cosmology
High Energy Physics