Publications

2023

Sharjah-Sat-3: A Low-Cost 6U CubeSat for Space Weather Applications
- Fernini I.
- Rustem A. R
- Kalemci E.
- Amari T.
- Faroukh Y.
- Alkaabi T.
- Bin Ashour M.
- Alhammadi A.
- Alansaari M.
- Alketbi F.
- Sharif M.
- Manousakis A.
- Mubasshir Shaikh M.
- Darya A.
- Alnaimy H. M K.
, 2023.
Shafranov shift correction to the Furth–Yoshikawa scaling of tokamak adiabatic compression
- Nicolas T
- Lütjens Hinrich
- Sauter O
- Garbet X
Plasma Physics and Controlled Fusion, IOP Publishing, 2023, 65 (5), pp.054004. Abstract In 1970, Furth and Yoshikawa (1970 Phys. Fluids 13 2593–6) introduced the scalings of adiabatic plasma compression. Basically, if the shape of the external plasma boundary and the aspect ratio are preserved during the compression, then the density, kinetic pressure, beta and current scale respectively as n ∼ C 3 , p ∼ C 5 , B ∼ C 2 , β ∼ C , I t ∼ C , where C is the linear compression ratio, that is, the ratio between initial and final major radii. In this work, we show analytically, by expanding the Grad–Shafranov equation in terms of C , that the deviation to the Furth–Yoshikawa scaling is related to the Shafranov shift that arises when beta increases at large compression ratios. There is an obvious effect of the Shafranov shift because the axis is moved to a region with larger volume element, and an indirect effect, associated to the relation between flux and radius. The latter effect adds to the first, and is of the same order of magnitude. The result is that the pressure increases less than the C 5 scaling, which can have a significant impact on the fusion power achieved at maximum compression. The analytical results are backed up by equilibrium simulations carried out with the CHEASE code. Equilibria are obtained for different values of C , with conservation of the total fluxes, q profile, and entropy of the plasma. The agreement of the theory and simulations is very good when the boundary of the plasma is circular and the aspect ratio small. When the aspect ratio is close to 1, and/or the boundary not circular, the analytical result gives the gist of the reduction of compression. Finally, a pressure anisotropy ( p ⊥ − p ∥ ) / p approximately equal to the increase in normalized Shafranov shift is predicted. (10.1088/1361-6587/acc5ae)
DOI : 10.1088/1361-6587/acc5ae
Charge fluctuations, hydrodynamics and transport in the square-lattice Hubbard model
- Vučičević J.
- Predin S.
- Ferrero Michel
Physical Review B, American Physical Society, 2023, 107 (15), pp.155140. Recent experimental results suggest that a particular hydrodynamic theory describes charge fluctuations at long wavelengths in the square-lattice Hubbard model. Due to the continuity equation, the correlation functions for the charge and the current are directly connected: the parameters of the effective hydrodynamic model thus determine the optical conductivity. Here we investigate the validity of the proposed hydrodynamic theory in the full range of parameters of the Hubbard model. In the non-interacting case, there is no effective hydrodynamics, and the charge fluctuations present a rich variety of non-universal behaviors. At weak coupling, the optical conductivity is consistent with the hydrodynamic theory: at low frequency one observes a Lorentzian-shaped Drude peak, and the high-temperature limit for the relation between the two hydrodynamic model parameters is reproduced; However, the high-frequency asymptotics is necessarily different. At strong coupling, we find that a generalized hydrodynamic law is consistent with our quantum Monte Carlo, as well as the finite-temperature Lanczos results from literature. Most importantly, the temperature dependence of the hydrodynamic parameters as well as the dc resistivity are found to be very similar in the weak and the strong-coupling regimes. (10.1103/PhysRevB.107.155140)
DOI : 10.1103/PhysRevB.107.155140
Phenomenology of double deeply virtual Compton scattering in the era of new experiments
- Deja K.
- Martinez-Fernandez V.
- Pire B.
- Sznajder P.
- Wagner J.
Physical Review D, American Physical Society, 2023, 107 (9), pp.094035. We revisit the phenomenology of the deep exclusive electroproduction of a lepton pair, i.e. double deeply virtual Compton scattering (DDVCS), in view of new experiments planned in the near future. The importance of DDVCS in the reconstruction of generalized parton distributions (GPDs) in their full kinematic domain is emphasized. Using Kleiss-Stirling spinor techniques, we provide the leading order complex amplitudes for both DDVCS and Bethe-Heithler sub-processes. Such a formulation turns out to be convenient for practical implementation in the PARTONS framework and EpIC Monte Carlo generator that we use in simulation studies. (10.1103/PhysRevD.107.094035)
DOI : 10.1103/PhysRevD.107.094035
Inducing techniques for quantitative recurrence and applications to Misiurewicz maps and Doubly intermittent maps
- Bansard-Tresse Dylan
- Freitas Jorge Milhazes
, 2023. We prove an abstract result establishing that one can obtain the convergence of Rare Events Point Processes counting the number of orbital visits to a sequence of shrinking target sets from the convergence of corresponding point processes for some induced system and matching shadowing shrinking sets inside the base of the inducing scheme. We apply this result to prove a dichotomy for two classes of non-uniformly hyperbolic interval maps: Misiurewicz quadratic maps and doubly intermittent maps. The dichotomy holds in the sense that the shrinking target sets may accumulate in any individual point ζ chosen in the phase space and then one either obtains a limiting homogeneous Poisson process at every non-periodic point ζ or a limiting compound Poisson process with geometric multiplicity distribution at every periodic point. We also highlight the reconstruction performed in order to recover the multiplicity distribution for a periodic orbit sitting outside the base of the induced map.
A model for pion collinear parton distribution function and form factor
- Venturini Simone
- Pasquini Barbara
- Rodini Simone
, 2023. We developed a model for the pion light-front wave function (LFWF) that incorporates valence, sea and gluon degrees of freedom. Using the LFWF overlap representation, we derived parametrizations for the pion parton distribution functions and the electromagnetic form factor. These parametrizations depend on two distinct sets of parameters, enabling separate fits of the longitudinal- and transverse-momentum dependencies of the LFWF. The pion PDFs are extracted from available Drell-Yan and photon-production data using the xFitter framework and are found well compatible with existing extractions. Furthermore, the fit of the electromagnetic form factor of the pion to all the available experimental data works quite successfully.
Parton cascades at DLA: the role of the evolution variable
- Andrés Carlota
- Apolinário Liliana
- Armesto Néstor
- Cordeiro André
- Dominguez Fabio
- Milhano José Guilherme
, 2024, HardProbes2023, pp.178. While experimental studies on jet quenching have achieved a large sophistication, the theoretical description of this phenomenon still misses some important points. One of them is the interplay of vacuum-like emissions, usually formulated in momentum space, with the medium induced ones that demand an interplay with a space-time picture of the medium and thus must be formulated in position space. A unified description of both vacuum and medium-induced emissions is lacking. In this work, we compute the tree-level probability of a double gluon emission in vacuum, and identify the enhanced phase-space regions for each diagram, corresponding to different configurations of the parton cascade. This calculation provides a parametric form for the formation times associated with each diagram, highlighting the equivalence of various ordering variables at double logarithmic accuracy. This equivalence is further explored by building a toy Monte-Carlo parton shower ordered in formation time, virtuality, transverse momentum, and angle. Aiming at a link with jet substructure, we compute the Lund Plane distributions and trajectories for each ordering prescription. We also compute the distributions in number of splittings and final partons, with the goal of clarifying the differences to be expected from the different ordering variables and the vetoes that must be implemented at Monte Carlo level to conserve energy-momentum, which turn out to have a sizeable influence on the shower's evolution. (10.22323/1.438.0178)
DOI : 10.22323/1.438.0178
Jet medium modifications
- Andres Carlota
, 2024, HardProbes2023, pp.013. Since the start of the heavy-ion collision programs at the Relativistic Heavy Ion Collider and the Large Hadron Collider, the study of jet modifications resulting from their interactions with the produced QCD matter has provided a unique tool to investigate and characterize the properties of the quark-gluon plasma. In this mini-overview, I will present the recent theoretical advancements in describing and understanding the modifications of jets within a QCD medium. (10.22323/1.438.0013)
DOI : 10.22323/1.438.0013
Large population limit of the spectrum of killed birth-and-death processes
- Chazottes J.-R
- Collet P
- Méléard S
Journal of Functional Analysis, Elsevier, 2023, 285 (9), pp.110092. We consider a general class of birth-and-death processes with state space {0, 1, 2, 3,. . .} which describes the size of a population going eventually to extinction with probability one. We obtain the complete spectrum of the generator of the process killed at 0 in the large population limit, that is, we scale the process by a parameter K, and take the limit K → +∞. We assume that the di erential equation dx/dt = b(x)−d(x) describing the infinite population limit (in any finite-time interval) has a repulsive fixed point at 0, and an attractive fixed point x * > 0. We prove that, asymptotically, the spectrum is the superposition of two spectra. One is the spectrum of the generator of an Ornstein-Uhlenbeck process, which is n(b (x *) − d (x *)), n ≥ 0. The other one is the spectrum of a continuous-time binary branching process conditioned on nonextinction, and is given by n(d (0) − b (0)), n ≥ 1. A major di culty is that di erent scales and function spaces are involved. We work at the level of the eigenfunctions that we split over di erent regions, and study their asymptotic dependence on K in each region. In particular, we prove that the spectral gap goes to min b (0) − d (0), d (x *) − b (x *). This work complements a previous work of ours in which we studied the approximation of the quasi-stationary distribution and of the mean time to extinction. (10.1016/j.jfa.2023.110092)
DOI : 10.1016/j.jfa.2023.110092
Revealing Local Temporal Profile of Laser Pulses of Intensity above 1014 W/cm2
- Lu Qi
- Zhang Xiang
- Couairon Arnaud
- Liu Yi
Sensors, MDPI, 2023, 23 (6), pp.3101. We demonstrated a method for in situ temporal characterization of an intense femtosecond laser pulse around its focus where the laser intensity exceeds 1014 W/cm2. Our method is based on the second harmonic generation (SHG) by a relatively weak femtosecond probe pulse and the intense femtosecond pulses under analysis in the gas plasma. With the increase in the gas pressure, it was found that the incident pulse evolves from a Gaussian profile to a more complicated structure featured by multiple peaks in the temporal domain. Numerical simulations of filamentation propagation support the experimental observations of temporal evolution. This simple method can be applied to many situations involving femtosecond laser–gas interaction, when the temporal profile of the femtosecond pump laser pulse with an intensity above 1014 W/cm2 cannot be measured in traditional ways. (10.3390/s23063101)
DOI : 10.3390/s23063101
Terrestrial Very-Long-Baseline Atom Interferometry: Workshop Summary
- Abend Sven
- Allard Baptiste
- Alonso Iván
- Antoniadis John
- Araújo Henrique
- Arduini Gianluigi
- Arnold Aidan
- Asano Tobias
- Augst Nadja
- Badurina Leonardo
- Balaž Antun
- Banks Hannah
- Barone Michele
- Barsanti Michele
- Bassi Angelo
- Battelier Baptiste
- Baynham Charles
- Beaufils Quentin
- Belić Aleksandar
- Beniwal Ankit
- Bernabeu Jose
- Bertinelli Francesco
- Bertoldi Andrea
- Biswas Ikbal Ahamed
- Blas Diego
- Boegel Patrick
- Bogojević Aleksandar
- Böhm Jonas
- Böhringer Samuel
- Bongs Kai
- Bouyer Philippe
- Brand Christian
- Brimis Apostolos
- Buchmueller Oliver
- Cacciapuoti Luigi
- Calatroni Sergio
- Canuel Benjamin
- Caprini Chiara
- Caramete Ana
- Caramete Laurentiu
- Carlesso Matteo
- Carlton John
- Casariego Mateo
- Charmandaris Vassilis
- Chen Yu-Ao
- Chiofalo Maria Luisa
- Cimbri Alessia
- Coleman Jonathon
- Constantin Florin Lucian
- Contaldi Carlo
- Cui Yanou
- Ros Elisa Da
- Davies Gavin
- Rosendo Esther del Pino
- Deppner Christian
- Derevianko Andrei
- Rham Claudia De
- Roeck Albert De
- Derr Daniel
- Di Pumpo Fabio
- Djordjevic Goran
- Döbrich Babette
- Domokos Peter
- Dornan Peter
- Doser Michael
- Drougakis Giannis
- Dunningham Jacob
- Duspayev Alisher
- Easo Sajan
- Eby Joshua
- Efremov Maxim
- Ekelof Tord
- Elertas Gedminas
- Ellis John
- Evans David
- Fadeev Pavel
- Fanì Mattia
- Fassi Farida
- Fattori Marco
- Fayet Pierre
- Felea Daniel
- Feng Jie
- Friedrich Alexander
- Fuchs Elina
- Gaaloul Naceur
- Gao Dongfeng
- Gardner Susan
- Garraway Barry
- Gauguet Alexandre
- Gerlach Sandra
- Gersemann Matthias
- Gibson Valerie
- Giese Enno
- Giudice Gian
- Glasbrenner Eric
- Gündoğan Mustafa
- Haehnelt Martin
- Hakulinen Timo
- Hammerer Klemens
- Hanımeli Ekim
- Harte Tiffany
- Hawkins Leonie
- Hees Aurelien
- Heise Jaret
- Henderson Victoria
- Herrmann Sven
- Hird Thomas
- Hogan Jason
- Holst Bodil
- Holynski Michael
- Hussain Kamran
- Janson Gregor
- Jeglič Peter
- Jelezko Fedor
- Kagan Michael
- Kalliokoski Matti
- Kasevich Mark
- Kehagias Alex
- Kilian Eva
- Koley Soumen
- Konrad Bernd
- Kopp Joachim
- Kornakov Georgy
- Kovachy Tim
- Krutzik Markus
- Kumar Mukesh
- Kumar Pradeep
- Lämmerzahl Claus
- Landsberg Greg
- Langlois Mehdi
- Lanigan Bryony
- Lellouch Samuel
- Leone Bruno
- Poncin-Lafitte Christophe Le
- Lewicki Marek
- Leykauf Bastian
- Lezeik Ali
- Lombriser Lucas
- Luis Lopez-Gonzalez J.
- Lopez Asamar Elias
- Monjaraz Cristian López
- Luciano Giuseppe Gaetano
- Mahmoud M.
- Maleknejad Azadeh
- Krutzik Markus
- Marteau Jacques
- Massonnet Didier
- Mazumdar Anupam
- Mccabe Christopher
- Meister Matthias
- Menu Jonathan
- Messineo Giuseppe
- Micalizio Salvatore
- Millington Peter
- Milosevic Milan
- Mitchell Jeremiah
- Montero Mario
- Morley Gavin
- Müller Jürgen
- Ioğlu Özgür
- Ni Wei-Tou
- Noller Johannes
- Odžak Senad
- Oi Daniel
- Omar Yasser
- Pahl Julia
- Paling Sean
- Pandey Saurabh
- Pappas George
- Pareek Vinay
- Pasatembou Elizabeth
- Pelucchi Emanuele
- Pereira dos Santos Franck
- Piest Baptist
- Pikovski Igor
- Pilaftsis Apostolos
- Plunkett Robert
- Poggiani Rosa
- Prevedelli Marco
- Puputti Julia
- Veettil Vishnupriya Puthiya
- Quenby John
- Rafelski Johann
- Rajendran Surjeet
- Rasel Ernst
- Sfar Haifa Rejeb
- Reynaud Serge
- Richaud Andrea
- Rodzinka Tangui
- Roura Albert
- Rudolph Jan
- Sabulsky Dylan
- Safronova Marianna
- Santamaria Luigi
- Schilling Manuel
- Schkolnik Vladimir
- Schleich Wolfgang
- Schlippert Dennis
- Schneider Ulrich
- Schreck Florian
- Schubert Christian
- Schwersenz Nico
- Semakin Aleksei
- Sergijenko Olga
- Shao Lijing
- Shipsey Ian
- Singh Rajeev
- Smerzi Augusto
- Sopuerta Carlos
- Spallicci Alessandro
- Stefanescu Petruta
- Stergioulas Nikolaos
- Ströhle Jannik
- Struckmann Christian
- Tentindo Silvia
- Throssell Henry
- Tino Guglielmo
- Tinsley Jonathan
- Tintareanu Mircea Ovidiu
- Tkalčec Kimberly
- Tolley Andrew.
- Tornatore Vincenza
- Torres-Orjuela Alejandro
- Treutlein Philipp
- Trombettoni Andrea
- Tsai Yu-Dai
- Ufrecht Christian
- Ulmer Stefan
- Valuch Daniel
- Vaskonen Ville
- Vázquez-Aceves Verónica
- Vitanov Nikolay
- Vogt Christian
- Klitzing Wolf Von
- Vukics András
- Walser Reinhold
- Wang Jin
- Warburton Niels
- Webber-Date Alexander
- Wenzlawski André
- Werner Michael
- Williams Jason
- Windpassinger Patrick
- Wolf Peter
- Woerner Lisa
- Xuereb André
- Yahia Mohamed
- Cruzeiro Emmanuel Zambrini
- Zarei Moslem
- Zhan Mingsheng
- Zhou Lin
- Zupan Jure
- Zupanič Erik
, 2024, 6 (2), pp.024701. 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. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more km-scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions. (10.1116/5.0185291)
DOI : 10.1116/5.0185291
SolSat: A Low-Cost 3-U CubeSat System for Space Weather applications
- Faroukh Y.
- Fernini I.
- Kalemci E.
- Amari T.
- Fernini R.
- Al-Kaabi T.
- Al-Hammadi A.
- Al-Ansaari M. A.
- Alketbi F.
- Al-Sabt I. H.
- Binashour M.
- Sharif M.
- Manousakis A.
- Shaikh M.
- Darya A. M.
- Alnaimiy H. M. K.
, 2023.
Localization in ultracold-atom quasiperiodic models
- Sanchez-Palencia Laurent
, 2023.
Accessing chiral-even quark generalised parton distributions in the exclusive photoproduction of a $ \gamma \pi ^{\pm} $ pair with large invariant mass in both fixed-target and collider experiments
- Duplančić Goran
- Nabeebaccus Saad
- Passek-Kumerički Kornelija
- Pire Bernard
- Szymanowski Lech
- Wallon Samuel
Journal of High Energy Physics, Springer, 2023, 03, pp.241. We compute the exclusive photoproduction of a $\gamma\,\pi^\pm$ pair using the collinear factorisation framework, in the kinematic regime where the pair has a large invariant mass. This exclusive channel presents a new avenue for the investigation of GPDs. It is particularly interesting as the high centre of mass energies available at future experiments will allow the study of GPDs at small skewness $ \xi $. We compute the scattering amplitude of the process, at leading twist and leading order in $\alpha_s$, which is used to estimate its cross-section and linear polarisation asymmetries with respect to the incoming photon, for JLab~12-GeV, COMPASS, future EIC and LHC (in ultra-peripheral collisions) kinematics. We find that the order of magnitude of estimates are sufficiently large for a dedicated experimental analysis to be performed, especially at JLab. We also compare the results from an asymptotic distribution amplitude (DA) to those using a recently proposed \textit{holographic} DA. (10.1007/JHEP03(2023)241)
DOI : 10.1007/JHEP03(2023)241
Precision Studies of QCD in the Low Energy Domain of the EIC
- Burkert V.D.
- Elouadrhiri L.
- Afanasev A.
- Arrington J.
- Contalbrigo M.
- Cosyn W.
- Deshpande A.
- Glazier D.I.
- Ji X.
- Liuti S.
- Oh Y.
- Richards D.
- Satogata T.
- Vossen A.
- Abdolmaleki H.
- Albataineh A.
- Aidala C.A.
- Alexandrou C.
- Avagyan H.
- Bacchetta A.
- Baker M.
- Benmokhtar F.
- Bernauer J.C.
- Bissolotti C.
- Briscoe W.
- Cao Xu
- Carlson C.E.
- Cichy K.
- Cloet I.C.
- Cocuzza C.
- Cole P.L.
- Constantinou M.
- Courtoy A.
- Dahiyah H.
- Dehmelt K.
- Diehl S.
- Dilks C.
- Djalali C.
- Dupré R.
- Dusa S.C.
- El-Bennich B.
- El Fassi L.
- Frederico T.
- Freese A.
- Gamage B.R.
- Gamberg L.
- Ghoshal R.R.
- Girod F.X.
- Goncalves V.P.
- Gotra Y.
- Guo F.K.
- Guo X.
- Hattawy M.
- Hatta Y.
- Hayward T.
- Hen O.
- Huber G. M.
- Hyde C.
- Isupov E.L.
- Jacak B.
- Jacobs W.
- Jentsch A.
- Ji C.R.
- Joosten S.
- Kalantarians N.
- Kang Z.
- Kim A.
- Klein S.
- Kriesten B.
- Kumano S.
- Kumar A.
- Kumericki K.
- Kuchera M.
- Lai W.K.
- Li Jin
- Li Shujie
- Li W.
- Li X.
- Lin H.-W.
- Liu K.F.
- Liu Xiaohui
- Markowitz P.
- Mathieu V.
- Mceneaney M.
- Mekki A.
- De Melo J.P. B. C.
- Meziani Z.E.
- Milner R.
- Mkrtchyan H.
- Mochalov V.
- Mokeev V.
- Morozov V.
- Moutarde H.
- Munos C.
- Murray M.
- Mtingwa S.
- Nadel-Turonski P.
- Okorokov V.A.
- Onyie E.
- Pappalardo L.L.
- Papandreou Z.
- Pecar C.
- Pilloni A.
- Pire B.
- Polys N.
- Prokudin A.
- Przybycien M.
- Qiu J-W.
- Radici M.
- Reed R.
- Ringer F.
- Roy B.J.
- Sato N.
- Schäfer A.
- Schmookler B.
- Schnell G.
- Schweitzer P.
- Seidl R.
- Semenov-Tian-Shansky K.M.
- Serna F.
- Shaban F.
- Shabestari M.H.
- Shiells K.
- Signori A.
- Spiesberger H.
- Strakovsky I.
- Sufian R.S.
- Szczepaniak A.
- Teodorescu L.
- Terry J.
- Teryaev O.
- Tessarotto F.
- Timmer C.
- Nasser Tawfik Abdel
- Valenzuela Cazares L.
- Vladimirov A.
- Voutier E.
- Watts D.
- Wilson D.
- Winney D.
- Xiao B.
- Ye Z.
- Ye Zh.
- Yuan F.
- Zachariou N.
- Zahed I.
- Zhang J.L.
- Zhang Y.
- Zhou J.
Progress in Particle and Nuclear Physics, Pergamon Press ; Elsevier [1978-....], 2023, 2023, pp.104032. The manuscript focuses on the high impact science of the EIC with objective to identify a portion of the science program for QCD precision studies that requires or greatly benefits from high luminosity and low center-of-mass energies. The science topics include (1) Generalized Parton Distributions, 3D imagining and mechanical properties of the nucleon (2) mass and spin of the nucleon (3) Momentum dependence of the nucleon in semi-inclusive deep inelastic scattering (4) Exotic meson spectroscopy (5) Science highlights of nuclei (6) Precision studies of Lattice QCD in the EIC era (7) Science of far-forward particle detection (8) Radiative effects and corrections (9) Artificial Intelligence (10) EIC interaction regions for high impact science program with discovery potential. This paper documents the scientific basis for supporting such a program and helps to define the path toward the realization of the second EIC interaction region. (10.1016/j.ppnp.2023.104032)
DOI : 10.1016/j.ppnp.2023.104032
The Tensor Harish-Chandra–Itzykson–Zuber Integral II: Detecting Entanglement in Large Quantum Systems
- Collins Benoît
- Gurau Razvan
- Lionni Luca
Communications in Mathematical Physics, Springer Verlag, 2023, 401 (1), pp.669-716. We consider the recently introduced generalization of the Harish-Chandra--Itzykson--Zuber integral to tensors and discuss its asymptotic behavior when the characteristic size N of the tensors is taken to be large. This study requires us to make assumptions on the scaling with N of the external tensors. We analyze a two-parameter class of asymptotic scaling ansätze, uncovering several non-trivial asymptotic regimes. This study is relevant for analyzing the entanglement properties of multipartite quantum systems. We discuss potential applications of our results to this domain, in particular in the context of randomized local measurements. (10.1007/s00220-023-04653-5)
DOI : 10.1007/s00220-023-04653-5
Optimal Control of Laser-Plasma Instabilities Using Spike Trains of Uneven Duration and Delay: STUD Pulses
- Afeyan Bedros
- Hüller Stefan
, 2021. Adaptive methods of laser irradiation of plasmas are proposed consisting of deterministic, `on-off' amplitude modulations in time, and intermittently changing speckle-patterns. These laser pulses consist of a series of picosecond time-scale spikes in a spike train of uneven duration and delay (STUD pulses), in contrast to hydrodynamic-time-scale modulated, multi-nanosecond pulses for laser fusion. Properly designed STUD pulses minimize backscatter and tame any absorptive parametric instability for a given set of plasma conditions, by adjusting the modulation periods, duty cycles and spatial hot-spot-distribution scrambling-rates of the spikes. Traditional methods of beam conditioning are subsumed or surpassed by STUD pulses. In addition, STUD pulses allow an advance in the control of instabilities driven by spatially overlapped laser beams by allowing the spikes of crossing beams to be temporally staggered. When the intensity peaks of one fall within the nulls of its crossing beam, it allows an on-off switch or a dimmer for pairwise or multi-beam interactions.
Excitonic Insulators and Superfluidity in Two-Dimensional Bilayers without External Fields
- Nilsson F.
- Kuisma M.
- Pakdel S.
- Thygesen K.
Journal of Physical Chemistry Letters, American Chemical Society, 2023, 14 (9), pp.2277-2283. (10.1021/acs.jpclett.3c00090)
DOI : 10.1021/acs.jpclett.3c00090
The $S=1$ dimer system K$_2$Ni(MoO$_4$)$_2$: a candidate for magnon Bose-Einstein condensation
- Lenz B.
- Koteswararao B.
- Biermann S.
- Khuntia P.
- Baenitz M.
- Panda S. K.
Physical Review B, American Physical Society, 2023, 106 (18), pp.L180408. Dimerized quantum magnets provide a unique possibility to investigate Bose-Einstein condensation of magnetic excitations in crystalline systems at low temperature. Here, we model the low-temperature magnetic properties of the recently synthesized spin $S=1$ dimer system K${}_2$Ni(MoO${}_4$)$_2$ and propose it as a new candidate material for triplon and quintuplon condensation. Based on a first principles analysis of its electronic structure, we derive an effective spin-dimer model that we first solve within a mean-field approximation to refine its parameters in comparison to experiment. Finally, the model is solved by employing a numerically exact quantum Monte Carlo technique which leads to magnetic properties in good agreement with experimental magnetization and thermodynamic results. We discuss the emergent spin model of K${}_2$Ni(MoO${}_4$)$_2$ in view of condensation of magnetic excitations in a broad parameter regime. Finally, we comment on a geometrical peculiarity of the proposed model and discuss how it could host a supersolid phase upon structural distortions. (10.1103/PhysRevB.106.L180408)
DOI : 10.1103/PhysRevB.106.L180408
Probing chiral-even and chiral-odd leading twist quark generalised parton distributions through the exclusive photoproduction of a gamma rho pair
- Duplančić Goran
- Nabeebaccus Saad
- Passek-Kumerički Kornelija
- Pire Bernard
- Szymanowski Lech
- Wallon Samuel
Physical Review D, American Physical Society, 2023, 107 (9), pp.094023. We extend our studies of a new class of $2 \to 3$ exclusive processes using the collinear factorisation framework by considering the exclusive photoproduction of a $\gamma\,\rho$ pair, in the kinematics where the pair has a large invariant mass, {and the outgoing $ \rho $-meson has a sufficiently large transverse momentum to not resonate with the nucleon}. We cover the whole kinematical range from medium energies in fixed target experiments to very large energies of colliders, by considering the experimental conditions of JLab~12-GeV, COMPASS, future EIC and LHC (in ultra-peripheral collisions) cases. One of the main interest in studying the present process is that it provides access to both chiral-even and chiral-odd GPDs, depending on the polarisation of the outgoing $\rho$-meson, both at leading twist. Our analysis covers both neutral and charged $ \rho $-mesons. We find that the order of magnitude of the obtained cross sections are sufficiently large for a dedicated experimental analysis to be performed, especially at JLab, for both longitudinally and transversely polarised $\rho$. Furthermore, we compute the linear photon beam polarisation asymmetry {which is} sizeable for a longitudinally polarised meson. These predictions are obtained for both asymptotic distribution amplitude (DA) and the \textit{holographic} DA. (10.1103/PhysRevD.107.094023)
DOI : 10.1103/PhysRevD.107.094023
Multibeam Laser Plasma Interaction at Gekko XII laser facility in conditions relevant for Direct-Drive Inertial Confinement Fusion
- Cristoforetti Gabriele
- Koester P.
- Atzeni S.
- Batani D.
- Fujioka S.
- Hironaka Y.
- Hüller Stefan
- Idesaka T.
- Katagiri K.
- Kawasaki K.
- Kodama R.
- Mancelli D.
- Nicolai Ph.
- Ozaki N.
- Schiavi A.
- Shigemori K.
- Takizawa R.
- Tamagawa T.
- Tanaka D.
- Tentori A.
- Umeda Y.
- Yogo A.
- Gizzi L.A.
High Power Laser Science and Engineering, Cambridge University Press, 2023, 11, pp.1-11. Laser Plasma Interaction and hot electrons have been characterized in detail in laser irradiation conditions relevant for direct-drive Inertial Confinement F usion. T he e xperiment h as b een carried out at Gekko XII laser facility in multibeam planar geometry at intensity ∼ 3 • 10 15 W/cm 2. Experimental data suggest that high-energy electrons, with temperature 20-50 keV and conversion efficiencies η < 1% , we re ma inly pr oduced by th e da mping of el ectron pl asma wa ves dr iven by Two Plasmon Decay. Stimulated Raman Scattering is observed in a near-threshold growth regime, producing a reflectivity o f ∼ 0 .01%, a nd i s w ell d escribed b y a n a nalytical m odel a ccounting for the convective growth in independent speckles. The experiment reveals that both TPD and SRS are collectively driven by multiple beams resulting in a more vigorous growth than that driven by single-beam laser intensity. (10.1017/hpl.2023.13)
DOI : 10.1017/hpl.2023.13
The Melonic Large-N Limit in Quantum Field Theory
- Benedetti Dario
, 2023. This is a thesis presented for the French habilitation (HDR, for ``Habilitation à diriger des recherches''). It reviews my recent work on quantum field theories whose large-N limit is dominated by melonic diagrams.
Possible structural quantum criticality tuned by rare-earth ion substitution in infinite-layer nickelates
- Subedi Alaska
Physical Review Materials, American Physical Society, 2023, 7 (2), pp.024801. (10.1103/PhysRevMaterials.7.024801)
DOI : 10.1103/PhysRevMaterials.7.024801
Cumulative Effects in 100 kHz Repetition‐Rate Laser‐Induced Plasma Filaments in Air
- Wang Tie-Jun
- Ebrahim Mehdi H
- Afxenti Ivi
- Adamou Dionysis
- Dada Adetunmise C
- Li Ruxin
- Leng Yuxin
- Diels Jean-Claude
- Faccio Daniele
- Couairon Arnaud
- Milián Carles
- Clerici Matteo
Advanced Photonics Research, Wiley, 2023, 4 (3). Cumulative effects are crucial for applications of laser filaments, such as for the remote transfer of energy and the control of electric discharges. Up to now, studies of cumulative effects in the air of high‐repetition‐rate pulse trains have been performed at lower rates than 10 kHz. Herein, the nonlinear effects associated with short plasma filaments produced by pulses of moderate energy (0.4 mJ per pulse) and repetition rates up to 100 kHz are experimentally characterized. With increasing repetition rate, a decrease in absorption, fluorescence emission, and breakdown voltage and concurrently an increase in peak intensity and third‐harmonic‐generation efficiency are observed. Hydrodynamic simulations of the heated gas show that the observed decreases are directly related to a quasi‐stationary state of reduced gas density in the filament. However, further investigations are required to fully understand the physics underpinning the observed sharp reduction of the breakdown voltage at 100 kHz repetition rates. The results may prove relevant for energy and information delivery applications by laser‐induced air waveguide or electric discharge and lightning control. (10.1002/adpr.202200338)
DOI : 10.1002/adpr.202200338
The tensor Harish-Chandra–Itzykson–Zuber integral I: Weingarten calculus and a generalization of monotone Hurwitz numbers
- Collins Benoît
- Gurau Razvan
- Lionni Luca
Journal of the European Mathematical Society, European Mathematical Society, 2023. (10.4171/JEMS/1315)
DOI : 10.4171/JEMS/1315

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