43 citations · 196 across the 14 of their papers we have counts for
14 papers
Hawking emission of massive vector fields by Kerr black holes
Marco Calzà, Miguel Faria, Yuber F. Perez-Gonzalez +1
We compute, for the first time, the Hawking emission spectrum of massive vector (Proca) fields by spinning Kerr black holes, determining the associated greybody factors and the res…
Evaporating cosmologically coupled black holes
Marco Calzà, Davide Pedrotti, Massimiliano Rinaldi +1
Cosmologically coupled black holes (CCBHs), whose masses evolve in response to the cosmological expansion, have recently attracted significant theoretical and observational interes…
Importance of being nonminimally coupled: Scalar Hawking radiation from regular black holes
Marco Calzà, Massimiliano Rinaldi, Sunny Vagnozzi
In curved space-time, a scalar field is generically expected to couple to curvature, via a coupling of the form . Yet in the study of Hawking emission from regular black…
Primordial regular black holes as all the dark matter. III. Covariant canonical quantum gravity models
Marco Calzà, Davide Pedrotti, Guan-Wen Yuan +1
In earlier companion papers, we showed that non-singular primordial black holes (PBHs) could account for all the dark matter (DM) over a significantly wider mass range compared to…
Machine Learning-Based Analytical Expressions for Gray-Body Factors and Application to Primordial Black Holes
Guan-Wen Yuan, Marco Calzà, Davide Pedrotti
Symbolic Regression (SR) is a machine learning approach that explores the space of mathematical expressions to identify those that best fit a given dataset, balancing both accuracy…
Trinity of black hole correspondences: Shadows, quasinormal modes, graybody factors, and cautionary remarks
Davide Pedrotti, Marco Calzà
Correspondences between apparently distant concepts are ubiquitous in theoretical physics. In the context of black holes (BHs), quasinormal modes (QNMs) were shown to be linked to…
Primordial regular black holes as all the dark matter. II. Non-time-radial-symmetric and loop quantum gravity-inspired metrics
Marco Calzà, Davide Pedrotti, Sunny Vagnozzi
It is a common belief that a theory of quantum gravity should ultimately cure curvature singularities which are inevitable within General Relativity, and plague for instance the Sc…
Primordial regular black holes as all the dark matter. I. Time-radial-symmetric metrics
Marco Calzà, Davide Pedrotti, Sunny Vagnozzi
Primordial black holes (PBHs) are usually assumed to be described by the Schwarzschild or Kerr metrics, which however feature unwelcome singularities. We study the possibility that…
Implications of cosmologically coupled black holes for pulsar timing arrays
Marco Calzà, Francesco Gianesello, Massimiliano Rinaldi +1
It has been argued that realistic models of (singularity-free) black holes (BHs) embedded within an expanding Universe are coupled to the large-scale cosmological dynamics, with st…
Evaporating Kerr black holes as probes of new physics
Marco Calzà, João G. Rosa
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…
Determining the spin of light primordial black holes with Hawking radiation II: high spin regime
Marco Calzà, João G. Rosa
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 pho…
Primordial black hole superradiance and evaporation in the string axiverse
Marco Calzà, João G. Rosa, Filipe Serrano
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 sup…
Determining the spin of light primordial black holes with Hawking radiation
Marco Calzà, João G. Rosa
We propose a method to determine the mass and spin of primordial black holes (PBHs) in the mass range kg (Hawking temperatures MeV GeV), base…
Evaporating primordial black holes, the string axiverse, and hot dark radiation
Marco Calzà, John March-Russell, João G. Rosa
We show that primordial black holes (PBHs) develop non-negligible spins through Hawking emission of the large number of axion-like particles generically present in string theory co…