Welcome to my WebPage.


I am an astronomer working at the Osservatorio Astrofisico di Arcetri, in Italy. I study relativistic magneto-hydrodynamics, relativistic winds, compact objects like Pulsars, and Neutron Stars, and X-rays. I am involved in the development of numerical algorithms for the study of fluids in Special and General Relativity, and for the modelling of magnetized Neutron Stars.
I also teach the High Energy Astrophysics class at the University of Firenze. Finally, I am in charge of the Outreach program of my Institute.

My Asteroid


The Asteroid 235999 has been named "Bucciantini" after me. My thanks to the "Gruppo Astrofili Montagna Pistoiese" for this great gift. It sits somewhere between Mars and Jupiter (search for 235999).

More

A PostDoc Abroad


In recent years, a small but steadily increasing number of funding programs have been put in place to help postdocs pursue their own research projects while remaining in someone else's lab. One such program--the Hubble Fellowships offered by NASA--has given Italian astronomer Niccolò Bucciantini unprecedented independence......

More

Back Home

«NON MI SONO mai sentito un cervello in fuga». Parola di Niccolò Bucciantini, astrofisico, 38 anni, aglianese trasferito a San Casciano Val di Pesa, ricercatore permanente all’osservatorio fiorentino di Arcetri dopo avere svolto progetti di ricerca negli Usa e in Svezia e tenuto conferenze in tutto il mondo. A 23 anni laurea in fisica ....

More

Axisymmetric equilibrium models for magnetised neutron stars in Scalar-Tensor Theories

Among the possible extensions of General Relativity that have been put forward in order to address some long standing issues in our understanding of the Universe, Scalar-Tensor Theories have received a lot of attention for their simplicity. Interestingly, some of these predict a potentially observable non-linear phenomenon, known as spontaneous scalarisation, in neutron stars. Neutron stars are ideal laboratories to investigate the properties of matter under extreme conditions, and in particular they are known to harbour the strongest magnetic fields in the Universe. Here, for the first time.... [...]

J. Soldateschi et al., 2020, A&A, 640, A44

Iron line from neutron star accretion discs in scalar tensor theories

The Fe Kα fluorescent line at 6.4 keV is a powerful probe of the space-time metric in the vicinity of accreting compact objects. We investigated here how some alternative theories of gravity, namely scalar tensor theories, that invoke the presence of a non-minimally coupled scalar field and predict the existence of strongly scalarized neutron stars (NSs), change the expected line shape with respect to General Relativity. By taking into account both deviations from the general relativistic orbital dynamics of the accreting disc ..... [...]

N. Bucciantini & J. Soldateschi, 2020, MNRAS, 495, L56

General relativistic magnetohydrodynamic dynamo in thick accretion discs: fully non-linear simulations

The recent imaging of the M87 black hole at millimetre wavelengths by the Event Horizon Telescope (EHT) collaboration has triggered a renewed interest in numerical models for the accretion of magnetized plasma in the regime of general relativistic magnetohydrodynamics. Here, non-ideal simulations, including both the resistive effects and, above all, the mean-field dynamo action due to sub-scale, unresolved turbulence, are applied for the first time to such systems in the fully non-linear regime [...]

N. Tomei et al., 2020, MNRAS, 491, 2346