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Collective motion of energy depot active disks.
Soft Matter
November 2024
Departamento de Estructura de la Materia, Física Térmica y Electrónica, Universidad Complutense de Madrid, Madrid 28040, Spain.
In the present work we have studied collectives of active disks with an energy depot, moving in the two-dimensional plane and interacting an excluded volume. The energy depot accounts for the extraction of energy taking place at the level of each particle in order to perform self-propulsion, included in an underdamped Langevin dynamics. We show that this model undergoes a flocking transition, exhibiting some of the key features of the Vicsek model, namely, band formation and giant number fluctuations.
View Article and Find Full Text PDFHadron-ion collisions in Pythia and the vector-meson dominance model for photoproduction.
Eur Phys J C Part Fields
November 2024
Department of Physics, University of Jyvaskyla, P.O. Box 35, Fl-40014 Jyvaskyla, Finland.
Article Synopsis
- The extension of the Pythia Monte Carlo event generator allows for detailed simulations of collisions between a hadron beam and nuclear targets, with energy variations for each event.
- The work builds on existing models like Angantyr for heavy ions and includes a vector-meson dominance (VMD) model for simulating real photon interactions in photo-nuclear collisions.
- Validation with HERA data shows the model's effectiveness, and the generated events for ultra-peripheral heavy-ion collisions at the LHC align with ATLAS measurements, demonstrating consistency in single-particle multiplicity and azimuthal anisotropy patterns.
Effects of Quantum Fluctuations on the Low-Energy Collective Modes of Two-Dimensional Superfluid Fermi Gases from the BCS to the Bose Limit.
Phys Rev Lett
September 2023
School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
We investigate the effects of quantum fluctuations on the low-energy collective modes of two-dimensional (2D) s-wave Fermi superfluids from the BCS to the Bose limit. We compare our results to recent Bragg scattering experiments in 2D box potentials, with very good agreement. We show that quantum fluctuations in the phase and modulus of the pairing order parameter are absolutely necessary to give physically acceptable chemical potential and dispersion relation of the low-energy collective mode throughout the BCS to Bose evolution.
View Article and Find Full Text PDFStrengths and limitations of the adiabatic exact-exchange kernel for total energy calculations.
J Chem Phys
May 2023
CEA, DAM, DIF, F-91297 Arpajon, France.
We investigate the adiabatic approximation to the exact-exchange kernel for calculating correlation energies within the adiabatic-connection fluctuation-dissipation framework of time-dependent density functional theory. A numerical study is performed on a set of systems having bonds of different character (H2 and N2 molecules, H-chain, H2-dimer, solid-Ar, and the H2O-dimer). We find that the adiabatic kernel can be sufficient in strongly bound covalent systems, yielding similar bond lengths and binding energies.
View Article and Find Full Text PDFProbing Charm Quark Dynamics via Multiparticle Correlations in Pb-Pb Collisions at sqrt[s_{NN}]=5.02 TeV.
Phys Rev Lett
July 2022
University of Wisconsin - Madison, Madison, Wisconsin, USA.
Multiparticle azimuthal correlations of prompt D^{0} mesons are measured in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of sqrt[s_{NN}]=5.02 TeV. For the first time, a four-particle cumulant method is used to extract the second Fourier coefficient of the azimuthal distribution (v_{2}) of D^{0} mesons as a function of event centrality and the D^{0} transverse momentum.
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