Cosmology News & Events

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Sociedade Portuguesa de Relatividade e Gravitação (SPRG)

2015 marks the centennial of the General Theory of Relativity (GR), presented by Albert Einstein in 1915. Motivated by this celebration, understanding that GR is an important part of the scientific world heritage and recognizing the growing international influence of Portuguese researchers working in this area, the "Portuguese Society of Relativity and Gravitation" (SPRG) was formally established in 2015.

Dynamics of Robertson-Walker spacetimes with diffusion

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Speaker
Artur Alho (CAMGSD - IST)
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Venue
GAP room
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Abstract: We study the dynamics of spatially homogeneous and isotropic spacetimes containing a fluid undergoing microscopic velocity diffusion in a cosmological scalar field. After deriving a few exact solutions of the equations, we continue by analyzing the qualitative behavior of general solutions. To this purpose we recast the equations in the form of a two dimensional dynamical system and perform a global analysis of the flow. Among the admissible behaviors, we find solutions that are asymptotically de-Sitter both in the past and future time direction and which undergo accelerated expansion at all times.

IBERICOS 2014

Ibericos 2014 poster
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Venue
Physics Amphitheatre
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The IX Iberian Cosmology Meeting took place in Aveiro, Portugal, at the Physics Department of the University of Aveiro, from the 28th to the 30th of April 2014. This series of meetings is aimed at encouraging the interaction and collaboration between researchers working in Cosmology and related areas (Gravitation, Particle Physics and Astronomy) in Portugal and Spain. Researchers working in other countries will also be most welcome.

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

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Speaker
Masato Minamitsuji (IST, Lisbon)
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Venue
GAP room
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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.