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2024-11-07
04:54
Intergalactic magnetism in a gamma-ray beam as a model of Porphyrion / Neronov, A. ; Vazza, F. ; Brandenburg, A. ; Caprini, C.
We estimate the magnetic field in the jets of the recently discovered 7 Mpc long Porphyrion system. [...]
NORDITA-2024-041 ; CERN-TH-2024-187 ; arXiv:2411.01640. - 5.
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2024-11-02
05:02
What is the origin of the JWST SMBHs? / Ellis, John ; Fairbairn, Malcolm ; Urrutia, Juan ; Vaskonen, Ville
We present a new semi-analytical model for the evolution of galaxies and supermassive black holes (SMBHs) that is based on the extended Press-Schechter formalism and phenomenological modelling of star formation. [...]
KCL-PH-TH/2024-55 ; CERN-TH-2024-184 ; AION-REPORT/2024-05 ; arXiv:2410.24224. - 5.
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2024-11-02
04:50
From data to the analytic S-matrix: A Bootstrap fit of the pion scattering amplitude / Guerrieri, Andrea (CERN ; London, City U. ; Perimeter Inst. Theor. Phys. ; Padua U.) ; Häring, Kelian (CERN ; Delta ITP, Amsterdam ; EPFL, Lausanne, FSL) ; Su, Ning (Caltech ; MIT)
We propose a novel strategy to fit experimental data using a UV complete amplitude ansatz satisfying the constraints of Analyticity, Crossing, and Unitarity. [...]
CERN-TH-2024-177 ; CALT-TH-2024-038 ; arXiv:2410.23333. - 10.
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2024-11-01
04:32
What is the graviton pole made of? / Häring, Kelian (Delta ITP, Amsterdam ; EPFL, Lausanne, FSL ; CERN) ; Zhiboedov, Alexander (CERN)
We explore the physical mechanisms responsible for generating the graviton pole in twice-subtracted dispersion relations, both in flat space and in AdS. [...]
CERN-TH-2024-178 ; arXiv:2410.21499. - 36.
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2024-11-01
04:29
The long-distance window of the hadronic vacuum polarization for the muon g-2 / RBC Collaboration
We provide the first ab-initio calculation of the Euclidean long-distance window of the isospin symmetric light-quark connected contribution to the hadronic vacuum polarization for the muon $g-2$ and find $a_\mu^{\rm LD,iso,conn,ud} = 411.4(4.3)(2.4) \times 10^{-10}$. [...]
CERN-TH-2024-182 ; arXiv:2410.20590. - 12.
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2024-11-01
04:18
What is the Geometry of Effective Field Theories? / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Lu, Xiaochuan (San Diego State U.) ; Zhang, Zhengkang (U. Utah, Salt Lake City)
We elaborate on a recently proposed geometric framework for scalar effective field theories. [...]
CERN-TH-2024-176 ; arXiv:2410.21378. - 7.
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2024-11-01
04:13
Event generation with Sherpa 3 / Bothmann, Enrico (Gottingen U.) ; Flower, Lois (Durham U., IPPP ; U. Liverpool (main)) ; Gütschow, Christian (University Coll. London) ; Höche, Stefan (Fermilab) ; Hoppe, Mareen (Dresden, Tech. U.) ; Isaacson, Joshua (Fermilab) ; Knobbe, Max (Gottingen U. ; Fermilab) ; Krauss, Frank (Durham U., IPPP) ; Meinzinger, Peter (Durham U., IPPP ; Zurich U.) ; Napoletano, Davide (Milan Bicocca U. ; INFN, Milan) et al.
Sherpa is a general-purpose Monte Carlo event generator for the simulation of particle collisions in high-energy collider experiments. [...]
IPPP/24/67 ; LTH-1385 ; FERMILAB-PUB-24-0748-T ; ZU-TH 51/24, CERN-TH-2024-171 ; ZU-TH 51/24 ; MCNET-24-17 ; CERN-TH-2024-171 ; arXiv:2410.22148. - 46.
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2024-10-25
12:03
Stellar-mass black-hole binaries in LISA: characteristics and complementarity with current-generation interferometers / Buscicchio, R. (Milan Bicocca U.) ; Torrado, J. (Padua U. ; INFN, Padua) ; Caprini, C. (Geneva U. ; CERN) ; Nardini, G. (Stavanger U.) ; Karnesis, N. (Thessaloniki U.) ; Pieroni, M. (CERN) ; Sesana, A. (Milan Bicocca U.)
Stellar-mass black-hole binaries are the most numerous gravitational-wave sources observed to date. [...]
CERN-TH-2024-173 ; arXiv:2410.18171. - 28.
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2024-10-25
12:00
$R^2$--Inflation Derived from 4d Strings, the Role of the Dilaton, and Turning the Swampland into a Mirage / Antoniadis, Ignatios (Chulalongkorn U. ; Paris, LPTHE) ; Nanopoulos, Dimitri V. (Athens Academy ; Texas A-M ; Athens U. ; HARC, Woodlands ; CERN) ; Olive, Keith A. (Minnesota U.)
Based on a previously derived superstring model possessing a cosmological sector that mimics Starobinsky inflation, we analyze several questions addressed in the recent literature: the generation of an effective $R^2$-term, the stability of the sgoldstino , the modular symmetry of the inflaton potential and the large distance swampland conjecture. [...]
UMN--TH--4402/24 ; FTPI--MINN--24/22 ; CERN-TH-2024-175 ; arXiv:2410.16541. - 24.
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2024-10-24
05:33
Hyperparameter Optimisation in Deep Learning from Ensemble Methods: Applications to Proton Structure / Cruz-Martinez, Juan (CERN) ; Jansen, Aaron (Netherlands eScience Center) ; van Oord, Gijs (Netherlands eScience Center) ; Rabemananjara, Tanjona R. (Vrije U., Amsterdam ; NIKHEF, Amsterdam) ; Rocha, Carlos M.R. (Netherlands eScience Center) ; Rojo, Juan (CERN ; Vrije U., Amsterdam ; NIKHEF, Amsterdam) ; Stegeman, Roy (U. Edinburgh, Higgs Ctr. Theor. Phys.)
Deep learning models are defined in terms of a large number of hyperparameters, such as network architectures and optimiser settings. [...]
CERN-TH-2024-168 ; arXiv:2410.16248. - 27.
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