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CERN Document Server Encontrados 68 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.62 segundos. 
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.
CORFU2023: 23rd Hellenic School and Workshops on Elementary Particle Physics and Gravity (CORFU 2023) - CORFU2023   23 Apr - 1 Oct 2023  - Corfu, Greece  / Agathos, Michalis (ed.) (KICC/DAMTP - U Cambridge); Anagnostopoulos, Konstantinos (ed.) (NTU Athens); Aschieri, Paolo (ed.) (U. del Piemonte Orientale); Basilakos, Spyros (ed.) (National Observatory of Athens); Capozziello, Salvatore (ed.) (U Napoli); Cardoso, Vitor (ed.) (NBI - U Copenhagen, IST Lisbon); Chatzistavrakidis, Athanassios (ed.) (Bošković Institute); Di Valentino, Eleonora (ed.) (U Sheffield); Gnecchi, Alessandra (ed.) (INFN, Padova); Kalinowski, Jan (ed.) (Warsaw U.) et al.
2023 - Published in : PoS: CORFU2024 (2024)
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7.
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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8.
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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9.
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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10.
A Note on the Swampland Distance Conjecture / Kehagias, A. (Natl. Tech. U., Athens) ; Riotto, A. (Geneva U., CAP ; CERN)
We discuss the Swampland Distance Conjecture in the framework of black hole thermodynamics. In particular, we consider black holes in de Sitter space and we show that the Swampland Distance Conjecture is a consequence of the fact that apparent horizons are always inside cosmic event horizons whenever they exist in the case of fast-roll inflation. [...]
arXiv:1911.09050.- 2020-01-01 - 3 p. - Published in : Fortsch. Phys. 68 (2020) 1900099 Fulltext: PDF;
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CERN Document Server : Encontrados 68 registros   1 - 10siguientefinal  ir al registro:
Vea también: autores con nombres similares
33 Kehagias, A
48 Kehagias, A A
68 Kehagias, Alex
3 Kehagias, Alexandros
1 Kehagias, Alexandros A.
1 Kehagias, Ath
3 Kehagias, Athanasios
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