Zobrazeno 1 - 10
of 1 194
pro vyhledávání: '"A. 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 PBHs are non-singular objects, considering four phenomenological, reg
Externí odkaz:
http://arxiv.org/abs/2409.02804
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 Schwarzschild and Kerr metrics, usually considered as prototypes for pri
Externí odkaz:
http://arxiv.org/abs/2409.02807
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 striking consequences, including pure cosmological growth of BH masses.
Externí odkaz:
http://arxiv.org/abs/2409.01801
Autor:
Pedrotti, Davide, Jiang, Jun-Qian, Escamilla, Luis A., da Costa, Simony Santos, Vagnozzi, Sunny
The Hubble tension is inherently multidimensional, and bears important implications for parameters beyond $H_0$. We discuss the key role of the matter density parameter $\Omega_m$ and the physical cold dark matter density $\omega_c$. We argue that on
Externí odkaz:
http://arxiv.org/abs/2408.04530
Mimetic gravity has gained significant appeal in cosmological contexts, but static spherically symmetric space-times within the baseline theory are highly non-trivial: the two natural solutions are a naked singularity and a black hole space-time obta
Externí odkaz:
http://arxiv.org/abs/2408.03241
We non-parametrically reconstruct the late-time expansion history in light of the latest Baryon Acoustic Oscillation (BAO) measurements from DESI combined with various Type Ia Supernovae (SNeIa) catalogs, using interpolation through piece-wise natura
Externí odkaz:
http://arxiv.org/abs/2408.02365
Autor:
Jiang, Jun-Qian, Giarè, William, Gariazzo, Stefano, Dainotti, Maria Giovanna, Di Valentino, Eleonora, Mena, Olga, Pedrotti, Davide, da Costa, Simony Santos, Vagnozzi, Sunny
The recent DESI Baryon Acoustic Oscillation measurements have led to tight upper limits on the neutrino mass sum, potentially in tension with oscillation constraints requiring $\sum m_{\nu} \gtrsim 0.06\,{\text{eV}}$. Under the physically motivated a
Externí odkaz:
http://arxiv.org/abs/2407.18047
Publikováno v:
Phys. Dark Univ. 46 (2024) 101676
It has recently been argued that the Hubble tension may call for a combination of both pre- and post-recombination new physics. Motivated by these considerations, we provide one of the first concrete case studies aimed at constructing such a viable c
Externí odkaz:
http://arxiv.org/abs/2407.01173
Autor:
O'Shea, Tomás, Davis, Anne-Christine, Giannotti, Maurizio, Vagnozzi, Sunny, Visinelli, Luca, Vogel, Julia K.
Publikováno v:
Phys. Rev. D 110, 063027 (2024)
We revisit the flux of chameleons (light scalar particles which could play a role in the dark energy phenomenon) produced in the interior of the Sun. Our novel analysis incorporates various important details and new processes that have previously bee
Externí odkaz:
http://arxiv.org/abs/2406.01691
Autor:
Pedrotti, Davide, Vagnozzi, Sunny
Eikonal quasinormal modes (QNMs) of black holes (BHs) and parameters of null geodesics, ultimately tied to the appearance of BHs to external observers, are known to be related, and the eikonal QNM-BH shadow radii correspondence has been extensively s
Externí odkaz:
http://arxiv.org/abs/2404.07589