Found 81 talks archived in Cosmology

Thursday June 3, 2021
Dr. Javier Redondo
Universidad de Zaragoza


We introduce the strong CP problem and the existence of the Axion as a possible solution. 

We discuss the possibility that axions are the dark matter of the Universe and the possible ways to

detect it or disprove it using: direct laboratory experiments as well as astrophysical and cosmological


Tuesday May 25, 2021
Drs. Olga Mena


In this talk, we shall review the impact of the neutrino properties on the different cosmological observables. We shall also present the latest cosmological constraints on the neutrino masses and on the effective number of relativistic species. Special attention would be devoted to the role of neutrinos in solving the present cosmological tensions.

Thursday May 13, 2021
Prof. Diego Blas
Imperial College


Bosonic ultra-light dark matter (ULDM) in the mass range m ~ $10^{-22} - 10^{-21} \rm eV$ has been invoked as a motivated candidate with new input for the small-scale `puzzles' of cold dark matter. Numerical simulations show that these models form cored density distributions at the center of galaxies ('solitons'). These works also found an empirical scaling relation between the mass of the large-scale host halo and the mass of the central soliton. We show that this relation predicts that the peak circular velocity of the outskirts of the galaxy should approximately repeat itself in the central region. Contrasting this prediction to the measured rotation curves of well-resolved near-by galaxies, we show that ULDM in the mass range m ~ $10^{-22} - 10^{-21} \rm eV$ is in tension with the data.

Tuesday May 11, 2021
Prof. Rodrigo Alonso
Durham University


Cosmological and astrophysical experimental data demark a large share of the limits of our knowledge in fundamental physics. I'll review two pieces of evidence of our ignorance: the nature of dark matter and the generation of baryon asymmetry in the universe, together with some of the proposed solutions to each. Finally, a novel connection between the two open problems will be presented.

Thursday April 29, 2021
Prof. Steen Hansen
COpenhagenUNi / DARK cosmology center


The expansion of the Universe is in an accelerated phase. This
acceleration was first estabilished by observations of SuperNovae, and
has since been confirmed through a range of independent observations.

The physical cause of this acceleration is coined Dark Energy, and
most observations indicate that Einsteins cosmological constant
provides a very good fit. In that case, approximately 70% of the
energy of the Universe presently consists of this cosmological

I will in this talk address the possibility that there may exist other
possible causes of the observed acceleration. In particular will I
discuss a concrete model, inspired by the well-known Lorentz force in
electromagnetism, where Dark Matter causes the acceleration.  With a
fairly simple numerical simulation we find that the model appears
consistent with all observations.

In such a model, where Dark Matter properties causes the acceleration
of the Universe, there is no need for a cosmological constant.

Tuesday June 12, 2018
Ismael Pérez Fournon, Juan Antonio Fernandez Ontiveros


In 2016, an international consortium led by SRON (Netherlands) in close collaboration with Japan (JAXA)
and with important Spanish participation (CAB, INTA and IAC/ULL) submitted the SPICA (SPace Infrared Telescope
for Cosmology and Astrophysics) proposal to ESA as part of the fifth call for medium-class missions (M5) in the
Cosmic Vision program. A total of 25 proposals competed for the M5 budget of 550 million euro. Together with two
other missions, THESEUS and EnVision, SPICA is now selected for the final round, in which three parallel
detailed studies will determine the best proposal. ESA is expected to select in 2021 its M5 mission, that
should be launched around 2030. SPICA has been designed to be extremely sensitive to infrared radiation,
much more than previous space infrared missions operating in the mid- and far-IR. In this talk we will review the
current status of SPICA and its instruments and describe the main science goals: the processes that regulate
the formation and evolution of galaxies and the formation of stars and planetary systems. In particular, we will discuss
how mid- to far-IR spectroscopic observations with SPICA could be exploited to understand key aspects in the chemical
evolution of galaxies, such as the assembly of nearby galaxies based on the spatial distribution of heavy element abundances,
the global content of metals in galaxies reaching the knee of the luminosity function up to z ∼ 3, and the dust composition
of galaxies at high-z. Possible synergies with facilities available in the late 2020s will be also discussed."

Wednesday September 20, 2017
Dr. Rien van de Weygaert
Kapteyn Astronomical Institute, The Netherlands


Tuesday September 19, 2017
Dr. Vicent Martínez
Observatorio Astronómico - Universitat de València, Spain


Tuesday September 19, 2017
Dr. Martín Crocce
Institute for Space Science, Barcelona (IEEC/CSIC), Spain


Tuesday September 19, 2017
Dr. Zachary Slepian
Lawrence Berkeley National Lab, USA


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