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CERN Document Server 2,050 notices trouvées  1 - 10suivantfin  aller vers la notice: La recherche a duré 2.23 secondes. 
1.
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;
2.
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
3.
Gravitational Waves from Peaks / De Luca, V. (Geneva U., Dept. Theor. Phys. ; Geneva U., CAP) ; Desjacques, V. (Technion) ; Franciolini, G. (Geneva U., Dept. Theor. Phys.) ; Riotto, A. (Geneva U., Dept. Theor. Phys. ; CERN)
We discuss a novel mechanism to generate gravitational waves in the early universe. A standard way to produce primordial black holes is to enhance at small-scales the overdensity perturbations generated during inflation. [...]
arXiv:1905.13459.- 2019-09-26 - 10 p. - Published in : JCAP 1909 (2019) 059 Fulltext: PDF;
4.
Implications of the detection of primordial gravitational waves for the Standard Model / Franciolini, G. (Geneva U., CAP) ; Giudice, G.F. (CERN) ; Racco, D. (Geneva U., CAP ; Perimeter Inst. Theor. Phys.) ; Riotto, A. (Geneva U., CAP)
The detection of primordial gravitational waves would not only have extraordinary implications for our understanding of early cosmology, but would also give non-trivial constraints on Standard Model parameters, under the assumption that no new physics enters below the Higgs instability scale. We study the resulting bounds on the top quark mass and the strong coupling constant, discussing their theoretical uncertainties and their robustness against changes in other parameters..
arXiv:1811.08118; CERN-TH-2018-233.- 2019-05-14 - 20 p. - Published in : JCAP 05 (2019) 022 Fulltext: PDF;
5.
Testbeam Characterization of a SiGe BiCMOS Monolithic Silicon Pixel Detector with Internal Gain Layer / Paolozzi, L. (Geneva U.) ; Milanesio, M. (Geneva U.) ; Moretti, T. (Geneva U.) ; Cardella, R. (Geneva U.) ; Kugathasan, T. (Geneva U.) ; Picardi, A. (Geneva U.) ; Elviretti, M. (CERN) ; Rücker, H. (CERN) ; Cadoux, F. (Geneva U.) ; Cardarelli, R. (Geneva U.) et al.
A monolithic silicon pixel ASIC prototype, produced in 2024 as part of the Horizon 2020 MONOLITH ERC Advanced project, was tested with a 120 GeV/c pion beam. [...]
arXiv:2412.07606.
- 18.
Fulltext
6.
The Ineludible non-Gaussianity of the Primordial Black Hole Abundance / De Luca, V. (Geneva U., CAP) ; Franciolini, G. (Geneva U., CAP) ; Kehagias, A. (Natl. Tech. U., Athens) ; Peloso, M. (U. Padua, Dept. Phys. Astron. ; INFN, Padua) ; Riotto, A. (Geneva U., CAP ; CERN) ; Ünal, C. (Rez, Nucl. Phys. Inst.)
We study the formation of primordial black holes when they are generated by the collapse of large overdensities in the early universe. Since the density contrast is related to the comoving curvature perturbation by a nonlinear relation, the overdensity statistics is unavoidably non-Gaussian. [...]
arXiv:1904.00970.- 2019-07-31 - 26 p. Fulltext: PDF;
7.
Primordial Black Holes from Broad Spectra: Abundance and Clustering / Moradinezhad Dizgah, Azadeh (Geneva U., CAP ; Harvard U., Phys. Dept.) ; Franciolini, Gabriele (Geneva U., CAP) ; Riotto, Antonio (Geneva U., CAP ; CERN)
A common mechanism to form primordial black holes in the early universe is by enhancing at small-scales the scalar perturbations generated during inflation. If these fluctuations have a large enough amplitude, they may collapse into primordial black holes upon horizon re-entry. [...]
arXiv:1906.08978.- 2019-11-04 - 22 p. - Published in : JCAP 1911 (2019) 001 Fulltext: PDF;
8.
A 50 ps resolution monolithic active pixel sensor without internal gain in SiGe BiCMOS technology / Iacobucci, Giuseppe (Geneva U.) ; Cardarelli, R. (INFN, Rome2) ; Débieux, S. (Geneva U.) ; Di Bello, F.A. (Geneva U.) ; Favre, Y. (Geneva U.) ; Hayakawa, D. (Geneva U.) ; Kaynak, M. (IHP, Frankfurt) ; Nessi, M. (Geneva U. ; CERN) ; Paolozzi, L. (Geneva U.) ; Rücker, H. (IHP, Frankfurt) et al.
A monolithic pixelated silicon detector designed for high time resolution has been produced in the SG13G2 130 nm SiGe BiCMOS technology of IHP Mikroelektronik. This proof-of-concept chip contains hexagonal pixels of 65 {\mu}m and 130 {\mu}m side. [...]
arXiv:1908.09709.- 2019-11-06 - 10 p. - Published in : JINST 14 (2019) P11008 Fulltext: fulltext1751067 - PDF; 1908.09709 - PDF; Fulltext from Publisher: PDF;
9.
Testbeam Results of the Picosecond Avalanche Detector Proof-Of-Concept Prototype / Iacobucci, G. (Geneva U.) ; Zambito, S. (Geneva U.) ; Milanesio, M. (Geneva U.) ; Moretti, T. (Geneva U.) ; Saidi, J. (Geneva U.) ; Paolozzi, L. (Geneva U. ; CERN) ; Munker, M. (Geneva U.) ; Cardella, R. (Geneva U.) ; Martinelli, F. (Geneva U.) ; Picardi, A. (Geneva U. ; CERN) et al.
The proof-of-concept prototype of the Picosecond Avalanche Detector, a multi-PN junction monolithic silicon detector with continuous gain layer deep in the sensor depleted region, was tested with a beam of 180 GeV pions at the CERN SPS. The prototype features low noise and fast SiGe BiCMOS frontend electronics and hexagonal pixels with 100 μm pitch. [...]
arXiv:2208.11019.- 2022-10-25 - 22 p. - Published in : JINST 17 (2022) P10040 Fulltext: document - PDF; 2208.11019 - PDF;
10.
20 ps time resolution with a fully-efficient monolithic silicon pixel detector without internal gain layer / Zambito, S. (Geneva U.) ; Milanesio, M. (Geneva U.) ; Moretti, T. (Geneva U.) ; Paolozzi, L. (Geneva U. ; CERN) ; Munker, M. (Geneva U.) ; Cardella, R. (Geneva U.) ; Kugathasan, T. (Geneva U.) ; Martinelli, F. (Geneva U.) ; Picardi, A. (Geneva U. ; CERN) ; Elviretti, M. (Leibniz U., Hannover) et al.
A second monolithic silicon pixel prototype was produced for the MONOLITH project. The ASIC contains a matrix of hexagonal pixels with 100 μm pitch, readout by a low-noise and very fast SiGe HBT frontend electronics. [...]
arXiv:2301.12244.- 2023-03-28 - 16 p. - Published in : JINST Fulltext: 2301.12244 - PDF; Publication - PDF;

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