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pro vyhledávání: '"Palessandro, Andrea"'
Autor:
Palessandro, Andrea
We construct an explicit model of inhomogeneous gravitational collapse leading to a naked singularity in which gravitational absorption is both efficient and observable. We propose that the infeasibility of graviton detection is simply a consequence
Externí odkaz:
http://arxiv.org/abs/2409.05533
Autor:
Palessandro, Andrea
Publikováno v:
Class. Quantum Grav. 41 (2024) 215011
The Gertsenshtein effect could in principle be used to detect a single graviton by firing it through a region filled with a constant magnetic field that enables its conversion to a photon, which can be efficiently detected via standard techniques. Th
Externí odkaz:
http://arxiv.org/abs/2405.01407
Publikováno v:
Physics of the Dark Universe Volume 44, May 2024, 101480
Through the Gertsenshtein effect, the presence of a large external B-field may allow photons and gravitons to mix in a way that resembles neutrino oscillations and is even more similar to axion-photon mixing. Assuming a background B-field (or any fie
Externí odkaz:
http://arxiv.org/abs/2401.08346
Autor:
Palessandro, Andrea, Rothman, Tony
Publikováno v:
Phys. Dark Univ. 42 (2023) 101341
As shown by Gertsenshtein in 1961, an external magnetic field can couple electromagnetic to gravitational waves, giving rise to oscillations between them. Viewed as a quantum process, the magnetic field has catalyzed the mixing of photon and graviton
Externí odkaz:
http://arxiv.org/abs/2301.12801
Autor:
Palessandro, Andrea, Rothman, Tony
Publikováno v:
Phys. Dark Univ. 40 (2023) 101187
As shown by Gertsenshtein in 1961, an external magnetic field can catalyze the mixing of graviton and photon states in a manner analogous to neutrino-flavor oscillations. We first present a straightforward derivation of the mechanism by a method base
Externí odkaz:
http://arxiv.org/abs/2301.02072
Autor:
Palessandro, Andrea, Sloth, Martin S.
Publikováno v:
Phys. Rev. D 101, 043504 (2020)
We consider the gravitational analogue of Lyman-alpha absorption lines in astronomical spectroscopy. If Einstein gravity with minimally coupled matter is valid up to the Planck scale, quantum bound states absorb gravitons of a specific frequency with
Externí odkaz:
http://arxiv.org/abs/1910.01657
Publikováno v:
Phys. Rev. D 99, 123011 (2019)
Particles in a yet unexplored dark sector with sufficiently large mass and small gauge coupling may form purely gravitational atoms (quantum gravitational bound states) with a rich phenomenology. In particular, we investigate the possibility of havin
Externí odkaz:
http://arxiv.org/abs/1903.12168
A minimal model of Cold Dark Matter (CDM) is a very massive particle with only gravitational interactions, also called Planckian Interacting Dark Matter (PIDM). Here we consider an extension of the PIDM framework by an unbroken $U(1)$ gauge symmetry
Externí odkaz:
http://arxiv.org/abs/1810.01428
Planckian Interacting Dark Matter (PIDM) is a minimal scenario of dark matter assuming only gravitational interactions with the standard model and with only one free parameter, the PIDM mass. PIDM can be successfully produced by gravitational scatter
Externí odkaz:
http://arxiv.org/abs/1709.09688
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