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CERN Document Server 26 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 0.72 sekúnd. 
1.
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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2.
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. [...]
2023 - 99 p. arXiv:2310.08183 - Published in : 10.1116/5.0185291
10.1116/5.0185291
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3.
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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4.
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.- 2024-03-08 - 20 p. - Published in : Class. Quantum Gravity 41 (2024) 075007 Fulltext: PDF;
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5.
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. - 11 p.
Fulltext
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6.
Explaining Nonlinearities in Black Hole Ringdowns from Symmetries / Kehagias, Alex (Natl. Tech. U., Athens ; CERN) ; Perrone, Davide (Geneva U.) ; Riotto, Antonio (Geneva U.) ; Riva, Francesco (Geneva U.)
It has been recently pointed out that nonlinear effects are necessary to model the ringdown stage of the gravitational waveform produced by the merger of two black holes giving rise to a remnant Kerr black hole. We show that this nonlinear behaviour is explained, both on the qualitative and quantitative level, by near-horizon symmetries of the Kerr black hole within the Kerr/CFT correspondence..
arXiv:2301.09345.- 2023-07-10 - 5 p. - Published in : Phys. Rev. D 108 (2023) L021501 Fulltext: PDF;
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7.
Cold atoms in space: community workshop summary and proposed road-map / Alonso, Iván (Balearic Islands U.) ; Alpigiani, Cristiano (Washington U., Seattle) ; Altschul, Brett (South Carolina U.) ; Araújo, Henrique (Imperial Coll., London) ; Arduini, Gianluigi (CERN) ; Arlt, Jan (Aarhus U.) ; Badurina, Leonardo (King's Coll. London) ; Balaž, Antun (Belgrade, Inst. Phys.) ; Bandarupally, Satvika (Florence U. ; INFN, Florence) ; Barish, Barry C. (LIGO Lab., Caltech) et al.
We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. [...]
arXiv:2201.07789; FERMILAB-CONF-22-694-V; CERN-TH-2022-004.- 2022-11-20 - 64 p. - Published in : EPJ Quant. Technol.: 9 (2022) , no. 1, pp. 30 Fulltext: bb4d1d31d6edd562e94939489bfc05d6 - PDF; 2201.07789 - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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8.
Aspects of Conformal Supergravity / Ferrara, Sergio (CERN ; Frascati) ; Kehagias, Alex (Munich U.) ; Lüst, Dieter (Munich, Max Planck Inst.)
In these lectures we discuss $N$-extended conformal supergravity and its spectrum in four dimensions. [...]
arXiv:2001.04998 ; CERN-TH-2020-005 ; MPP-2020-1 ; LMU-ASC 01/20. - 15 p.
Fulltext
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9.
Constraining graviton non-Gaussianity through the CMB bispectra / De Luca, Valerio (Geneva U., CAP) ; Franciolini, Gabriele (Geneva U., CAP) ; Kehagias, Alex (Natl. Tech. U., Athens) ; Riotto, Antonio (Geneva U., CAP ; CERN) ; Shiraishi, Maresuke (Kagawa U.)
Tensor non-Gaussianities are a key ingredient to test the symmetries and the presence of higher spin fields during the inflationary epoch. Indeed, the shape of the three point correlator of the graviton is totally fixed by the symmetries of the de Sitter stage and, in the case of parity conservation, gets contributions only from the ordinary gravity action plus a higher derivative term called the (Weyl)$^3$ action. [...]
arXiv:1908.00366.- 2019-09-25 - 8 p. - Published in : Phys. Rev. D 100 (2019) 063535 Fulltext: PDF; Fulltext from publisher: PDF;
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10.
Non-Gaussian Formation of Primordial Black Holes: Effects on the Threshold / Kehagias, Alex (Natl. Tech. U., Athens) ; Musco, Ilia (ICC, Barcelona U.) ; Riotto, Antonio (Geneva U., CAP ; CERN)
Primordial black holes could have been formed in the early universe from sufficiently large cosmological perturbations re-entering the horizon when the Universe is still radiation dominated. These originate from the spectrum of curvature perturbations generated during inflation at small-scales. [...]
arXiv:1906.07135.- 2019-12-10 - 28 p. - Published in : JCAP 12 (2019) 029 Fulltext: PDF;
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CERN Document Server : 26 záznamov nájdených   1 - 10ďalšíkoniec  skoč na záznam:
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33 Kehagias, A
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3 Kehagias, Athanasios
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