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Eppur è piatto? The cosmic chronometer take on spatial curvature and cosmic concordance
Sunny Vagnozzi, Abraham Loeb, Michele Moresco
The question of whether Cosmic Microwave Background (CMB) temperature and polarization data from Planck favor a spatially closed Universe with curvature parameter has been…
The galaxy power spectrum take on spatial curvature and cosmic concordance
Sunny Vagnozzi, Eleonora Di Valentino, Stefano Gariazzo +3
The concordance of the CDM cosmological model in light of current observations has been the subject of an intense debate in recent months. The 2018 Planck Cosmic Microwave Backg…
Implications of the NANOGrav results for inflation
Sunny Vagnozzi
The NANOGrav pulsar timing array experiment reported evidence for a stochastic common-spectrum process affecting pulsar timing residuals in its 12.5-year dataset, which might be in…
Soundness of Dark Energy properties
Eleonora Di Valentino, Stefano Gariazzo, Olga Mena +1
Type Ia Supernovae (SNeIa) used as standardizable candles have been instrumental in the discovery of cosmic acceleration, usually attributed to some form of dark energy (DE). Recen…
Black holes with scalar hair in light of the Event Horizon Telescope
Mohsen Khodadi, Alireza Allahyari, Sunny Vagnozzi +1
Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and more generally fundamental physics, particularly with regards to the existence of addit…
Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches
Steffen Hagstotz, Pablo F. de Salas, Stefano Gariazzo +5
We provide a consistent framework to set limits on properties of light sterile neutrinos coupled to all three active neutrinos using a combination of the latest cosmological data a…
Concerns regarding the use of black hole shadows as standard rulers
Sunny Vagnozzi, Cosimo Bambi, Luca Visinelli
Recently, Tsupko et al. have put forward the very interesting proposal to use the shadows of high-redshift supermassive black holes (SMBHs) as standard rulers. This would in princi…
Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope
Alireza Allahyari, Mohsen Khodadi, Sunny Vagnozzi +1
Non-linear electrodynamics (NLED) theories are well-motivated extensions of QED in the strong field regime, and have long been studied in the search for regular black hole (BH) sol…