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CERN Document Server Pronađeno je 31 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 1.30 sekundi 
1.
The AdS Perspective on the Nonlinear Tails in Black Hole Ringdown / Kehagias, Alex (Natl. Tech. U., Athens ; CERN) ; Riotto, Antonio (Geneva U., Dept. Theor. Phys.)
Black holes gradually settle into their static configuration by emitting gravitational waves, whose amplitude diminish over time according to a power-law decay at fixed spatial locations. [...]
arXiv:2506.14475. - 2025 - 7.
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2.
Nonlinear tails of gravitational waves in Schwarzschild black hole ringdown / Kehagias, Alex (Natl. Tech. U., Athens ; CERN) ; Riotto, Antonio (Geneva U., CAP)
Schwarzschild black holes evolve toward their static configuration by emitting gravitational waves, which decay over time following a power law at fixed spatial positions. We derive this power law analytically for the second-order even gravitational perturbations, demonstrating that it is determined by the fact that the second-order source decays as the inverse square of the distance. [...]
arXiv:2504.06224.- 2025-07-08 - 9 p. - Published in : Phys. Rev. D 112 (2025) 024023 Fulltext: PDF;
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3.
Long-Baseline Atom Interferometry / TVLBAI Proto Collaboration
Long-baseline atom interferometry is a promising technique for probing various aspects of fundamental physics, astrophysics and cosmology, including searches for ultralight dark matter (ULDM) and for gravitational waves (GWs) in the frequency range around 1~Hz that is not covered by present and planned detectors using laser interferometry. [...]
arXiv:2503.21366. - 12.
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4.
Is gauge mediation in the swampland? / Dalianis, Ioannis (Athens U.) ; Farakos, Fotis (Padua U. ; INFN, Padua) ; Kehagias, Alex (Natl. Tech. U., Athens)
We note that the typical gauge mediation of supersymmetry breaking is in tension with the global limit of the festina lente swampland bound. The alternatives are mediation/breaking schemes that decouple together with gravity, as for example gravity mediation, for which we highlight some basic phenomenological properties. [...]
arXiv:2305.17089; CERN-TH-2023-106.- 2023-07-13 - 7 p. Fulltext: PDF;
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5.
Terrestrial Very-Long-Baseline Atom Interferometry Workshop (TVLBAI 2024) 2nd Terrestrial Very-Long-Baseline Atom Interferometry Workshop (TVLBAI 2024)   3 - 5 Apr 2024  - London, United Kingdom  / Abdalla, Adam (Darmstadt, Tech. Hochsch.); Abe, Mahiro (Stanford U., Phys. Dept.); Abend, Sven (Leibniz U., Hannover); Abidi, Mouine (Leibniz U., Hannover); Aidelsburger, Monika (Munich, Max Planck Inst. Quantenopt. ; Munich U. ; Munich U., ASC ; MCQST, Munich); Alibabaei, Ashkan (Leibniz U., Hannover); Allard, Baptiste (LCAR, Toulouse); Antoniadis, John (Athens U.); Arduini, Gianluigi (CERN); Augst, Nadja (DLR, Berlin) et al.
This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024, building on the initial discussions during the inaugural workshop held at CERN in March 2023. Like the summary of the first workshop, this document records a critical milestone for the international atom interferometry community. [...]
2025-04-03 - 79 p. arXiv:2412.14960 - Published in : 10.1140/epjqt/s40507-025-00344-3
10.1140/epjqt/s40507-025-00344-3
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6.
Renormalized Primordial Black Holes / Franciolini, Gabriele (CERN) ; Ianniccari, Andrea (Geneva U.) ; Kehagias, Alex (Geneva U. ; Natl. Tech. U., Athens) ; Perrone, Davide (Geneva U.) ; Riotto, Antonio (Geneva U.)
The formation of primordial black holes in the early universe may happen through the collapse of large curvature perturbations generated during a non-attractor phase of inflation or through a curvaton-like dynamics after inflation. The fact that such small-scale curvature perturbation is typically non-Gaussian leads to the renormalization of composite operators built up from the smoothed density contrast and entering in the calculation of the primordial black abundance. [...]
arXiv:2311.03239.- 2024-11-05 - 24 p. - Published in : JCAP 2411 (2024) 001 Fulltext: 2311.03239 - PDF; document - PDF;
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7.
Terrestrial Very-Long-Baseline Atom Interferometry: Workshop Summary Terrestrial Very-Long-Baseline Atom Interferometry Workshop (TVLBAI 2023)   13 - 14 Mar 2023  - CERN, Geneva, Switzerland  / Abend, Sven (Leibniz U., Hannover); Allard, Baptiste (LCAR, Toulouse); Alonso, Iván (Balearic Islands U.); Antoniadis, John (Crete U.); Araújo, Henrique (Imperial Coll., London); Arduini, Gianluigi (CERN); Arnold, Aidan S. (SUPA, UK ; Strathclyde U.); Aßmann, Tobias (Ulm U.); Augst, Nadja (DLR, Neustrelitz); Badurina, Leonardo (King's Coll. London ; Caltech) et al.
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. [...]
2024 - 99 p. arXiv:2310.08183 .- CERN-TH-2023-176 - Published in : 10.1116/5.0185291
10.1116/5.0185291
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8.
How well do we know the primordial black hole abundance: The crucial role of nonlinearities when approaching the horizon / De Luca, Valerio (Pennsylvania U.) ; Kehagias, Alex (Natl. Tech. U., Athens ; CERN) ; Riotto, Antonio (Geneva U.)
We discuss the non-linear corrections entering in the calculation of the primordial black hole abundance from the non-linear radiation transfer function and the determination of the true physical horizon crossing. We show that the current standard techniques to calculate the abundance of primordial black holes suffer from uncertainties and argue that the primordial black hole abundance may be much smaller than what routinely considered. [...]
arXiv:2307.13633.- 2023-09-15 - 12 p. - Published in : Phys. Rev. D 108 (2023) 063531 Fulltext: PDF;
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9.
The Weak Gravity Conjecture, Overcharged Shells and Gravitational Traps / Kehagias, Alex (Natl. Tech. U., Athens ; CERN) ; Kokkotas, Kostas D. (Tubingen U., IAAT) ; Riotto, Antonio (Geneva U., Dept. Theor. Phys. ; Annecy, LAPTH) ; Taskas, John (Natl. Tech. U., Athens) ; Tringas, George (Annecy, LAPTH)
The Weak Gravity Conjecture predicts that in quantum gravity there should exist overcharged states, that is states with charge larger than their mass. Extending this to large masses and charges, we are expecting similar overcharged classical solutions. [...]
arXiv:2305.07915; CERN-TH-2023-078.- 2024-03-08 - 20 p. - Published in : Class. Quantum Gravity 41 (2024) 075007 Fulltext: PDF;
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10.
On Nonlinear Black Hole Ringdowns from Gauge-Invariance and Measurements / Kehagias, Alex (Natl. Tech. U., Athens ; CERN) ; Riotto, Antonio (Geneva U., CAP ; U. Geneva (main))
It has been recently shown that nonlinear effects emerging at the time of the generation of the quasi-normal modes are necessary to model ringdowns from black hole mergers. [...]
arXiv:2302.01240 ; CERN-TH-2023-077. - 11.
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CERN Document Server : Pronađeno je 31 zapisa   1 - 10slijedećikraj  idi na zapis:
Također vidi: slična imena autora
33 Kehagias, A
48 Kehagias, A A
25 Kehagias, A.
3 Kehagias, Alexandros
1 Kehagias, Alexandros A.
1 Kehagias, Ath
3 Kehagias, Athanasios
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