359 citations · 3.2k across the 86 of their papers we have counts for
7 papers · 1 filter
A GREAT model comparison against the cosmological constant
Rubén Arjona, Llorenc Espinosa-Portales, Juan García-Bellido +1
Recently, a covariant formulation of non-equilibrium phenomena in the context of General Relativity was proposed in order to explain from first principles the observed accelerated…
Search for black hole hyperbolic encounters with gravitational wave detectors
Gonzalo Morrás, Juan García-Bellido, Savvas Nesseris
In recent years, the proposal that there is a large population of primordial black holes living in dense clusters has been gaining popularity. One natural consequence of these dens…
Late-transition vs smooth deformation models for the resolution of the Hubble crisis
George Alestas, David Camarena, Eleonora Di Valentino +4
Gravitational transitions at low redshifts () have been recently proposed as a solution to the Hubble and growth tensions. Such transitions would naturally lead to a trans…
Testing the CDM paradigm with growth rate data and machine learning
Rubén Arjona, Alessandro Melchiorri, Savvas Nesseris
The cosmological constant and cold dark matter (CDM) model () is one of the pillars of modern cosmology and is widely used as the de facto theoretical model by cur…
Machine Learning improved fits of the sound horizon at the baryon drag epoch
Andoni Aizpuru, Rubén Arjona, Savvas Nesseris
The baryon acoustic oscillations (BAO) have proven to be an invaluable tool in constraining the expansion history of the Universe at late times and are characterized by the comovin…
Complementary consistency test of the Copernican principle via Noether's theorem and machine learning forecasts
Rubén Arjona, Savvas Nesseris
The Copernican principle (CP), i.e. the assumption that we are not privileged observers of the Universe, is a fundamental tenet of the standard cosmological model. A violation of t…