SCOAP3 Repository 14 records found  1 - 10nextSearch took 0.01 seconds. 
1. Black-hole stability in non-local gravity / Calcagni, Gianluca ; Modesto, Leonardo ; Myung, Yun Soo
We prove that Ricci-flat vacuum exact solutions are stable under linear perturbations in a new class of weakly non-local gravitational theories finite at the quantum level..
Published in Physics letters B (2018) 10.1016/j.physletb.2018.06.041
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2. Initial conditions and degrees of freedom of non-local gravity / Calcagni, Gianluca ; Modesto, Leonardo ; Nardelli, Giuseppe
We prove the equivalence between non-local gravity with an arbitrary form factor and a non-local gravitational system with an extra rank-2 symmetric tensor. [...]
Published in JHEP 1805 (2018) 087 10.1007/JHEP05(2018)087 arXiv:1803.00561
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3. Finite entanglement entropy and spectral dimension in quantum gravity / Arzano, Michele ; Calcagni, Gianluca
What are the conditions on a field theoretic model leading to a finite entanglement entropy density? We prove two very general results: (1) Ultraviolet finiteness of a theory does not guarantee finiteness of the entropy density; (2) If the spectral dimension of the spatial boundary across which the entropy is calculated is non-negative at all scales, then the entanglement entropy cannot be finite. [...]
Published in EPJC 77 (2017) 835 10.1140/epjc/s10052-017-5393-5
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4. Imprint of quantum gravity in the dimension and fabric of spacetime / Amelino-Camelia, Giovanni ; Calcagni, Gianluca ; Ronco, Michele
We here conjecture that two much-studied aspects of quantum gravity, dimensional flow and spacetime fuzziness , might be deeply connected. [...]
Published in Physics letters B (2017) 10.1016/j.physletb.2017.10.032
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5. Stability of Schwarzschild singularity in non-local gravity / Calcagni, Gianluca ; Modesto, Leonardo
In a previous work, it was shown that all Ricci-flat spacetimes are exact solutions for a large class of non-local gravitational theories. [...]
Published in Physics letters B (2017) 10.1016/j.physletb.2017.09.018
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6. Dimensional flow and fuzziness in quantum gravity: Emergence of stochastic spacetime / Calcagni, Gianluca ; Ronco, Michele
We show that the uncertainty in distance and time measurements found by the heuristic combination of quantum mechanics and general relativity is reproduced in a purely classical and flat multi-fractal spacetime whose geometry changes with the probed scale (dimensional flow) and has non-zero imaginary dimension, corresponding to a discrete scale invariance at short distances. [...]
Published in Nuclear Physics B (2017) 10.1016/j.nuclphysb.2017.07.016
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7. Erratum to: Multifractional theories: an unconventional review / Calcagni, Gianluca
Published in JHEP 1706 (2017) 020 10.1007/JHEP06(2017)020
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8. Black holes in multi-fractional and Lorentz-violating models / Calcagni, Gianluca ; Rodríguez Fernández, David ; Ronco, Michele
We study static and radially symmetric black holes in the multi-fractional theories of gravity with q -derivatives and with weighted derivatives, frameworks where the spacetime dimension varies with the probed scale and geometry is characterized by at least one fundamental length ℓ∗ . [...]
Published in EPJC 77 (2017) 335 10.1140/epjc/s10052-017-4879-5
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9. Lorentz violations in multifractal spacetimes / Calcagni, Gianluca
Using the recent observation of gravitational waves (GW) produced by a black-hole merger, we place a lower bound on the energy above which a multifractal spacetime would display an anomalous geometry and, in particular, violations of Lorentz invariance. [...]
Published in EPJC 77 (2017) 291 10.1140/epjc/s10052-017-4841-6
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10. Multifractional theories: an unconventional review / Calcagni, Gianluca
We answer to 72 frequently asked questions about theories of multifractional spacetimes. [...]
Published in JHEP 1703 (2017) 138 10.1007/JHEP03(2017)138 arXiv:1612.05632
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