Twenty years ago, no one convincingly knew the age or the size of theUniverse to within a factor of two. Ten years ago, everyone agreed onthose same two numbers...
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TalkThe Hubble Constant: Relieving the Tension
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PublicationThe imprint of cosmological hydrogen recombination lines on the power spectrum of the CMB
We explore the imprint of the cosmological hydrogen recombination lines on the power spectrum of the cosmic microwave background (CMB). In particular, we focus...
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NewsThe James Webb observes the first galaxies in the universe and discovers and “impostor”
An international study, carried out by the James Webb Space Telescope (JWST) in which the Instituto de Astrofísica de Canarias (IAC) has participated, shows...
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PublicationThe Metallicity of Pregalactic Globular Clusters: The Observational Consequences of the First Stars
We explore a scenario in which metal-poor globular clusters (GCs) are enriched by the first supernovae in the universe. If the first stars in a 107 Msolar dark...
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PublicationThe primordial Helium abundance
The primordial abundance of 4He, YP, is one of the hottest themes in present-day astronomy, mostly due to its cosmological relevance. The disagreement between...
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PublicationThe primordial helium abundance and the number of neutrino families
Based on observations of HII regions and on the new computations of the recombination coefficients of the HeI lines by Porter el al. we obtain a primordial...
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PublicationThe Pristine survey - III. Spectroscopic confirmation of an efficient search for extremely metal-poor stars
The Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the Ca II H&K absorption lines, designed to efficiently search...
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PublicationThe Pristine survey - VI. The first three years of medium-resolution follow-up spectroscopy of Pristine EMP star candidates
We present the results of a 3-yr long, medium-resolution spectroscopic campaign aimed at identifying very metal-poor stars from candidates selected with the...
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TalkThe Standard Cosmological Model
This is the first talk of a series of four aimed to discuss about Cosmology. Here, I will review the basic concepts of the standard cosmological model, which...