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CERN Document Server 2,048 records found  1 - 10próximoend  jump to record: Search took 0.31 seconds. 
1.
Gravitational waves from binary black holes in a self-interacting scalar dark matter cloud / Boudon, Alexis (IPhT, Saclay) ; Brax, Philippe (IPhT, Saclay ; CERN) ; Valageas, Patrick (IPhT, Saclay) ; Wong, Leong Khim (IPhT, Saclay)
We investigate the imprints of accretion and dynamical friction on the gravitational-wave signals emitted by binary black holes embedded in a scalar dark matter cloud. As a key feature in this work, we focus on scalar fields with a repulsive self-interaction that balances against the self-gravity of the cloud. [...]
arXiv:2305.18540.- 2024-02-05 - 20 p. - Published in : Phys. Rev. D 109 (2024) 043504 Fulltext: PDF;
2.
IR side of positivity bounds / Bellazzini, Brando (IPhT, Saclay ; EPFL, Lausanne, LPTP ; CERN) ; Riembau, Marc (EPFL, Lausanne, LPTP) ; Riva, Francesco (Geneva U., Dept. Theor. Phys.)
We show how calculable IR loop effects impact positivity bounds in Effective Field Theories with causal and unitary UV completions. We identify infrared singularities which appear in dispersion relations at $|t|\lesssim m^2$. [...]
arXiv:2112.12561.- 2022-11-10 - 11 p. - Published in : Phys. Rev. D 106 (2022) 105008 Fulltext: 2112.12561 - PDF; Publication - PDF;
3.
Two-field Screening and its Cosmological Dynamics / Brax, Philippe (IPhT, Saclay ; CERN) ; Ouazzani, Ayoub (IPhT, Saclay ; LPENS, Paris)
We consider the screening of the axio-dilaton fields when both the dilaton and the axion couple to matter with Yukawa couplings. We analyse the screening of the dilaton in the vicinity of a compact object and find that this can only take place when special boundary conditions at infinity are imposed. [...]
arXiv:2307.06781.- 2023-09-15 - 23 p. - Published in : Phys. Rev. D 108 (2023) 063517 Fulltext: Publication - PDF; 2307.06781 - PDF;
4.
Extended Analysis of Neutrino-Dark Matter Interactions with Small-Scale CMB Experiments / Brax, Philippe (IPhT, Saclay ; CERN) ; van de Bruck, Carsten (Sheffield U.) ; Di Valentino, Eleonora (Sheffield U.) ; Giarè, William (Sheffield U.) ; Trojanowski, Sebastian (Warsaw, Copernicus Astron. Ctr. ; NCBJ, Warsaw)
We explore an extension of the standard $\Lambda$CDM model by including an interaction between neutrinos and dark matter, and making use of the ground based telescope data of the Cosmic Microwave Background (CMB) from the Atacama Cosmology Telescope (ACT). An indication for a non-zero coupling between dark matter and neutrinos (both assuming a temperature independent and $T^2$ dependent cross-section) is obtained at the 1$\sigma$ level coming from the ACT CMB data alone and when combined with the Planck CMB and Baryon Acoustic Oscillations (BAO) measurements. [...]
arXiv:2305.01383.- 2023-08-30 - 14 p. - Published in : Phys. Dark Univ. 42 (2023) 101321 Fulltext: Publication - PDF; 2305.01383 - PDF;
5.
Medium-enhanced $c\bar{c}$ radiation / Attems, Maximilian (CERN) ; Brewer, Jasmine (CERN) ; Innocenti, Gian Michele (CERN) ; Mazeliauskas, Aleksas (CERN) ; Park, Sohyun (CERN) ; van der Schee, Wilke (CERN) ; Soyez, Gregory (IPhT, Saclay) ; Wiedemann, Urs Achim (CERN)
We show that the same QCD formalism that accounts for the suppression of high-$p_T$ hadron and jet spectra in heavy-ion collisions predicts medium-enhanced production of $c\bar{c}$ pairs in jets..
arXiv:2209.13600; CERN-TH-2022-046.- 2024-05-21 - 8 p. - Published in : Phys. Rev. Lett. 132 (2024) 212301 Fulltext: 2209.13600 - PDF; Publication - PDF;
6.
Minimal sterile neutrino dark matter / Bringmann, Torsten (Oslo U. ; CERN) ; Depta, Paul Frederik (Heidelberg, Max Planck Inst.) ; Hufnagel, Marco (Brussels U.) ; Kersten, Jörn (Korea Inst. Advanced Study, Seoul ; Bergen U.) ; Ruderman, Joshua T. (New York U.) ; Schmidt-Hoberg, Kai (DESY)
We propose a novel mechanism to generate sterile neutrinos $\nu_s$ in the early Universe, by converting ordinary neutrinos $\nu_\alpha$ in scattering processes $\nu_s\nu_\alpha\to\nu_s\nu_s$. After initial production by oscillations, this leads to an exponential growth in the $\nu_s$ abundance. [...]
arXiv:2206.10630; CERN-TH-2022-099; DESY 22-102; ULB-TH/22-09.- 2023-04-01 - 12 p. - Published in : Phys. Rev. D 107 (2023) L071702 Fulltext: 2206.10630 - PDF; Publication - PDF;
7.
CP violation and determination of the $bs$ "flat" unitarity triangle at FCCee / Aleksan, Roy (IRFU, Saclay) ; Oliver, L. (IJCLab, Orsay) ; Perez, Emmanuel (CERN)
We investigate the sensitivity with which two angles of the "flat" unitarity triangle, defined by $V_{ub}^* V_{us} + V_{cb}^* V_{cs} + V_{tb}^* V_{ts} =0$, can possibly be measured directly at FCCee. We show that the measured errors on the angle $\alpha_s = \arg(- V_{ub}^* V_{us} /V_{tb}^* V_{ts})$ and $\beta_s = \arg(-V_{tb}^* V_{ts} / V_{cb}^* V_{cs})$ should be better than $0.4^\circ$ and $0.035^\circ$, respectively. [...]
arXiv:2107.02002.- 2022-03-01 - 27 p. - Published in : Phys. Rev. D 105 (2022) 053008 Fulltext: PDF; Fulltext from publisher: PDF;
8.
Sliding Naturalness: New Solution to the Strong-$CP$ and Electroweak-Hierarchy Problems / Tito D'Agnolo, Raffaele (IPhT, Saclay) ; Teresi, Daniele (CERN)
We present a novel framework to solve simultaneously the electroweak hierarchy problem and the strong-CP problem. A small but finite Higgs vacuum expectation value and a small $\theta$-angle are selected after the QCD phase transition, without relying on the Peccei-Quinn mechanism or other traditional solutions. [...]
arXiv:2106.04591; CERN-TH-2021-055.- 2022-01-12 - 6 p. - Published in : Phys. Rev. Lett. 128 (2022) 021803 Fulltext: 2106.04591 - PDF; PhysRevLett.128.021803 - PDF;
9.
Complete Lagrangian and set of Feynman rules for scalar leptoquarks / Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Schnell, Luc (Paris, LPTHE ; Zurich, ETH ; Ec. Polytech., Palaiseau (main))
Leptoquarks (LQs) have attracted increasing attention within recent years, mainly since they can explain the flavor anomalies found in $R(D^{(*)})$, $b \rightarrow s \ell^+ \ell^-$ transitions and the anomalous magnetic moment of the muon. In this article, we lay the groundwork for further automated analyses by presenting the complete Lagrangian and the corresponding set of Feynman rules for scalar leptoquarks. [...]
arXiv:2105.04844; CERN-TH-2021-074; PSI-PR-21-08; ZU-TH 19/21.- 2022-02 - 131 p. - Published in : Comput. Phys. Commun. 271 (2022) 108188 Fulltext: PDF;
10.
Positive Moments for Scattering Amplitudes / Bellazzini, Brando (IPhT, Saclay ; CERN) ; Elias Miró, Joan (ICTP, Trieste) ; Rattazzi, Riccardo (EPFL, Lausanne, LPTP) ; Riembau, Marc (EPFL, Lausanne, LPTP ; Geneva U., Dept. Theor. Phys.) ; Riva, Francesco (Geneva U., Dept. Theor. Phys.)
We find the complete set of conditions satisfied by the forward $2\to2$ scattering amplitude in unitarity and causal theories. These are based on an infinite set of energy dependent quantities -- the arcs -- which are dispersively expressed as moments of a positive measure defined at (arbitrarily) higher energies. [...]
arXiv:2011.00037.- 2021-08-01 - 17 p. - Published in : Phys. Rev. D 104 (2021) 036006 Fulltext: PDF; Fulltext from publisher: PDF;

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