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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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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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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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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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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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