Zobrazeno 1 - 10
of 881
pro vyhledávání: '"Rosa, P. G. P."'
Autor:
Neves, Daniel, Rosa, João G.
We study the dynamical evolution of superradiant instabilities of rotating black holes for multiple axion fields with comparable masses, motivated by string theory constructions, which typically exhibit a large number of light axions, with a broad ra
Externí odkaz:
http://arxiv.org/abs/2404.10507
Autor:
Calzà, Marco, Rosa, João G.
In the string axiverse scenario, primordial black holes (PBHs) can sustain non-negligible spin parameters as they evaporate. We show that tracking both the mass and spin evolution of a PBH in its final hour can yield a purely gravitational probe of n
Externí odkaz:
http://arxiv.org/abs/2312.09261
Autor:
Calzà, Marco, Rosa, João G.
We propose a method to determine the mass and spin of primordial black holes based on measuring the energy and emission rate at the dipolar and quadrupolar peaks in the primary photon Hawking spectrum, applicable for dimensionless spin parameters $\t
Externí odkaz:
http://arxiv.org/abs/2311.12930
Autor:
Ferraz, Paulo B., Rosa, João G.
We show that warm inflation can be successfully realized in the high temperature regime through dissipative interactions between the inflaton and a single fermionic degree of freedom, provided that the latter's mass is an oscillatory function of the
Externí odkaz:
http://arxiv.org/abs/2308.00564
In the string axiverse scenario, light primordial black holes may spin up due to the Hawking emission of a large number of light (sub-MeV) axions. We show that this may trigger superradiant instabilities associated with a heavier axion during the bla
Externí odkaz:
http://arxiv.org/abs/2306.09430
Publikováno v:
JCAP 06 (2024) 060
We compute the power spectrum of super-horizon curvature perturbations generated during a late period of thermal inflation, taking into account fluctuation-dissipation effects resulting from the scalar flaton field's interactions with the ambient rad
Externí odkaz:
http://arxiv.org/abs/2301.11666
We analyze the dynamics and observational signatures of axion clouds formed via the superradiant instability around primordial black holes, focusing on the mass range $10^{14}-10^{18}$ kg where the latter may account for all the dark matter. We take
Externí odkaz:
http://arxiv.org/abs/2301.01780
Autor:
Rosa, João G., Silva, Duarte M. C.
We propose a scenario that explains the comparable abundances of dark matter (DM) and baryons without any coincidence in the corresponding particle masses. Here, DM corresponds to heavy "dark baryons" in a hidden MSSM-like dark sector, where the supe
Externí odkaz:
http://arxiv.org/abs/2211.10359
Autor:
Calzà, Marco, Rosa, João G.
We propose a method to determine the mass and spin of primordial black holes (PBHs) in the mass range $5\times 10^7-10^{12}$ kg (Hawking temperatures $\sim10$ MeV $-200$ GeV), based on measuring the energy of specific features in the photon Hawking e
Externí odkaz:
http://arxiv.org/abs/2210.06500
Autor:
March-Russell, John, Rosa, João G.
We study the production of heavy, $\mu \gtrsim 1$ TeV, bosonic spin $s=0,1$ dark matter (DM) via the simultaneous processes of Hawking evaporation and superradiance (SR) from an initial population of small, $\lesssim 10^6$ kg, primordial black holes
Externí odkaz:
http://arxiv.org/abs/2205.15277