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

Scalar field dark matter with spontaneous symmetry breaking and the 3.5 keV line, Catarina Cosme, Joao G. Rosa, O. Bertolami; arXiv:1709.09674 [hep-ph].

Publication type
Regular Articles
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The role of fluctuation-dissipation dynamics in setting initial conditions for inflation, Mar Bastero-Gil, Arjun Berera, Robert Brandenberger, Ian G. Moss, Rudnei O. Ramos and João G. Rosa, e-Print: arXiv:1612.04726 [astro-ph.CO].

Publication type
Regular Articles
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Inflation in non-minimal matter-curvature coupling theories, Cláudio Gomes, João G. Rosa, Orfeu Bertolami, JCAP 1706 (2017) n.06, 021e-Print: arXiv:1611.02124 [gr-qc].

Publication type
Regular Articles
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Warm Little Inflaton, Mar Bastero-Gil, Arjun Berera, Rudnei O. Ramos and Joao G. Rosa, Phys. Rev. Lett. 117 (2016) 151301, e-print:arXiv:1604.08838 [hep-ph].

Publication type
Regular Articles
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Scalar field dark matter and the Higgs field, O. Bertolami, C. Cosme, J. G. Rosa, Phys. Lett. B759, 1-8 (2016)e-Print:arXiv:1603.06242 [hep-ph].

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Regular Articles
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Latest Cosmology News & Events

A no-go theorem for exotic alternatives to black holes as LIGO/Virgo sources

Five of the ground-breaking gravitational wave detections by the LIGO/Virgo collaboration have been interpreted as black hole collisions forming a more massive black hole. It is hard to demonstrate conclusively that these objects are indeed black holes, and there is a lively debate on the intriguing possibility that other, more exotic alternatives could explain the observations. In an article to appear in Physical Review Letters, Gr@v members P.

Chiral Magnetohydrodynamic Turbulence

N/A
Speaker
Natacha Leite (DESY, U. Hamburg)
Event date
Venue
GAP room
Event type
Abstract: I will present the influence of the chiral anomaly on the evolution of magnetohydrodynamics. In the early universe, before electroweak symmetry breaking, and in systems at high enough temperatures such that the electron mass can be ignored, the general description of a charged plasma needs to take into account the triangle anomaly. The interplay between turbulence and chiral magnetic effect can have important consequences on the evolution of magnetic fields, leading to the creation of maximally-helical fields from initially non-helical ones. Chiral effects can support a turbulent inverse cascade, causing a slower decrease of magnetic field with time and a faster growth of correlation length, when compared to the evolution predicted by the standard magnetohydrodynamical description. Using the weak anomaly approximation, specific solutions for the inverse cascade regime that show how chiral effects support it are derived.