Zobrazeno 1 - 10
of 4 289
pro vyhledávání: '"MEREGHETTI, A"'
Giant flares from magnetars can reach, for a fraction of a second, luminosities greater than 10$^{47}$ erg s$^{-1}$ in the hard X-ray/soft $\gamma$-ray range. This makes them visible at distances of several megaparsecs. However, at extragalactic dist
Externí odkaz:
http://arxiv.org/abs/2411.03235
The INTEGRAL satellite has collected a large amount of data on magnetars in our Galaxy, spanning more than 20 years starting from 2003. The large data set obtained with the IBIS/ISGRI instrument at energies above 20 keV allows us to study both the pr
Externí odkaz:
http://arxiv.org/abs/2410.23484
Calvera (1RXS J141256.0+792204) is a pulsar of characteristic age 285 kyr at a high Galactic latitude of b=+37{\deg}, detected only in soft thermal X-rays. We measure a new and precise proper motion for Calvera using Chandra HRC-I observations obtain
Externí odkaz:
http://arxiv.org/abs/2410.21828
We discuss the hadronic structure-dependent radiative corrections to the axial-vector coupling that controls single-nucleon weak charged-current processes -- commonly denoted by $g_A$. We match the Standard Model at the GeV scale onto chiral perturba
Externí odkaz:
http://arxiv.org/abs/2410.21404
A0538-66 is a neutron star/Be X-ray binary located in the Large Magellanic Cloud and, since its discovery in the seventies, it showed a peculiar behavior which makes it a unique object in the high-mass X-ray binaries scene: the extremely eccentric or
Externí odkaz:
http://arxiv.org/abs/2410.18606
We study the leading radiative correction to proton-proton fusion using the pionless effective field theory framework at leading order. We derive the relevant matrix elements and evaluate them using the method of regions. We benchmark the accuracy of
Externí odkaz:
http://arxiv.org/abs/2407.08015
Autor:
Cirigliano, Vincenzo, Dekens, Wouter, de Vries, Jordy, Gandolfi, Stefano, Hoferichter, Martin, Mereghetti, Emanuele
The accuracy of $V_{ud}$ determinations from superallowed $\beta$ decays critically hinges on control over radiative corrections. Recently, substantial progress has been made on the single-nucleon, universal corrections, while nucleus-dependent effec
Externí odkaz:
http://arxiv.org/abs/2405.18469
Autor:
Cirigliano, Vincenzo, Dekens, Wouter, de Vries, Jordy, Gandolfi, Stefano, Hoferichter, Martin, Mereghetti, Emanuele
Radiative corrections are essential for an accurate determination of $V_{ud}$ from superallowed $\beta$ decays. In view of recent progress in the single-nucleon sector, the uncertainty is dominated by the theoretical description of nucleus-dependent
Externí odkaz:
http://arxiv.org/abs/2405.18464
Autor:
Belfiore, Andrea, Salvaterra, Ruben, Sidoli, Lara, Israel, Gian Luca, Stella, Luigi, De Luca, Andrea, Mereghetti, Sandro, Esposito, Paolo, Pintore, Fabio, D'Aì, Antonino, Castillo, Guillermo Rodrìguez, Walton, Dominic J., Fürst, Felix, Magistrali, Danilo, Wolter, Anna, Imbrogno, Matteo
Publikováno v:
ApJ 965, 78B (2024)
We report on the orbit of the binary system powering the most extreme ultraluminous X-ray pulsar known to date: NGC 5907 ULX-1 (hereafter ULX1). ULX1 has been the target of a substantial multi-instrument campaign, mainly in the X-ray band, but no cle
Externí odkaz:
http://arxiv.org/abs/2405.04574
Sterile neutrinos with masses at the $\mathrm{keV}$ scale and mixing to the active neutrinos offer an elegant explanation of the observed dark matter (DM) density. However, the very same mixing inevitably leads to radiative photon emission and the no
Externí odkaz:
http://arxiv.org/abs/2405.00119