Renan Hirayama

ORCID: 0000-0003-2403-8073
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About
Contact & Profiles
Research Areas
  • High-Energy Particle Collisions Research
  • Quantum Chromodynamics and Particle Interactions
  • Particle physics theoretical and experimental studies
  • Cold Atom Physics and Bose-Einstein Condensates
  • Pulsars and Gravitational Waves Research
  • Particle accelerators and beam dynamics
  • Electron and X-Ray Spectroscopy Techniques
  • Fluid Dynamics Simulations and Interactions
  • High-pressure geophysics and materials
  • Nuclear reactor physics and engineering
  • Nuclear Physics and Applications
  • Gamma-ray bursts and supernovae
  • Fusion materials and technologies
  • Plasma Diagnostics and Applications

Goethe University Frankfurt
2023-2024

Frankfurt Institute for Advanced Studies
2022-2024

GSI Helmholtz Centre for Heavy Ion Research
2023-2024

Campbell Collaboration
2023

Abstract This review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. It includes theoretical first-principle results from lattice perturbative QCD, as well chiral effective field theory results. From the experimental side, it heavy-ion collision low-energy nuclear physics results, observations neutron stars their mergers. The validity different constraints, concerning specific conditions ranges applicability, is also provided.

10.1007/s41114-024-00049-6 article EN cc-by Living Reviews in Relativity 2024-06-05

This review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. It includes theoretical first-principle results from lattice perturbative QCD, as well chiral effective field theory results. From the experimental side, it heavy-ion collision low-energy nuclear physics results, observations neutron stars their mergers. The validity different constraints, concerning specific conditions ranges applicability, is also provided.

10.48550/arxiv.2303.17021 preprint EN other-oa arXiv (Cornell University) 2023-01-01

Effective spectral functions of the $\rho$ meson are reconstructed by considering lifetimes inside different media using hadronic transport SMASH (Simulating Many Accelerated Strongly-interacting Hadrons). Due to inelastic scatterings, resonance dynamically shortened (collisional broadening), even though employed approach assumes vacuum properties. Analyzing allows quantify an effective broadening decay width and function, which is important in order distinguish dynamical effects from...

10.1103/physrevc.107.025208 article EN cc-by Physical review. C 2023-02-27

We present calculations of dielectron anisotropic flow in heavy-ion collisions at HADES beam energies from a hadronic transport approach. The ongoing experimental analysis employs the traditional reaction plane method to evaluate coefficients ${v}_{n}$ and claims see isotropic radiation thermal quark-gluon plasma. show this paper that region above pion mass, dilepton measurement might suffer cancellation effects mask complicated underlying dynamics. Contributions different baryonic mesonic...

10.1103/physrevc.110.064903 article EN Physical review. C 2024-12-05

We introduce a fast and simple method of computing cumulants net-proton or net-charge fluctuations in event-by-event hydrodynamic simulations heavy-ion collisions. One evaluates the mean numbers particles every event. Cumulants are then expressed as function these numbers. implement corrections due to global conservation laws. The is tested using ideal Au+Au collisions at $\sqrt{s_{NN}}=200$ AGeV with NeXSPheRIO code. Results good agreement experimental data on by STAR collaboration.

10.1103/physrevc.107.024910 article EN Physical review. C 2023-02-17

Hadron lists based on experimental studies summarized by the Particle Data Group (PDG) are a crucial input for equation of state and thermal models used in study strongly-interacting matter produced heavy-ion collisions. Modeling these systems is carried out via hydrodynamical simulations, which followed hadronic transport codes that also require list as input. To remain consistent throughout different stages modeling collision, same hadron with its corresponding decays must be at each step....

10.48550/arxiv.2309.01737 preprint EN cc-by arXiv (Cornell University) 2023-01-01

We present calculations of dielectron anisotropic flow in heavy-ion collisions at HADES beam energies from a hadronic transport approach. The collectivity the electromagnetic radiation produced during evolution these has recently been dubbed as barometer, serving probe for velocity underlying matter. In particular, we study elliptic coefficient $v_2$ dileptons different systems, and its relation to hadrons.

10.22323/1.438.0194 article EN cc-by-nc-nd 2024-02-16

We present calculations of dielectron anisotropic flow in heavy-ion collisions at HADES beam energies from a hadronic transport approach. The ongoing experimental analysis employs the traditional reaction plane method to evaluate coefficients $v_n$ and claims see isotropic radiation thermal quark-gluon plasma. show this work, that region above pion mass, dilepton measurement might suffer cancellation effects mask complicated underlying dynamics. Contributions different baryonic mesonic...

10.48550/arxiv.2408.16603 preprint EN arXiv (Cornell University) 2024-08-29

The melting of vector meson peaks in dilepton measurements is a canonical example medium effects on strongly interacting matter. In the context on-shell hadronic transport, where resonance has fixed vacuum spectral function, this happens dynamically as suppresses emission by absorbing resonances. work, we analyse effective lifetimes $\rho$ to quantify such collisional broadening within SMASH approach, for both thermalized hadron gas and off-equilibrium matter created heavy-ion collisions.

10.22323/1.419.0021 article EN cc-by-nc-nd 2023-06-19

We explore the emergence of collisional broadening hadrons under influence different media using hadronic transport approach SMASH (Simulating Many Accelerated Strongly interacting Hadrons), which employs vacuum properties and contains no a priori information about in-medium effects. In this context, we define as decrease in lifetime hadrons, it arises from an interplay between cross-sections for inelastic processes available phase space. quantify effect various hadron species, both thermal...

10.3390/universe9090414 article EN cc-by Universe 2023-09-09

Effective spectral functions of the $ρ$ meson are reconstructed by considering lifetimes inside different media using hadronic transport SMASH (Simulating Many Accelerated Strongly-interacting Hadrons). Due to inelastic scatterings, resonance dynamically shortened (collisional broadening), even though employed approach assumes vacuum properties. Analyzing allows quantify an effective broadening decay width and function, which is important in order distinguish dynamical effects from...

10.48550/arxiv.2206.15166 preprint EN cc-by arXiv (Cornell University) 2022-01-01

Abstract To map QCD phase diagram is one of the greatest challenges for those who study at finite temperature. A class observables particular interest in this are net-baryon cumulants. However, hydrodynamic-based hybrid models have trouble computing higher order cumulants due to high statistics needed. The usual oversampling procedure increase such does not help situation because it smears event-by-event fluctuations. We propose a way compute avoiding issue and show its applications LHC energies.

10.1088/1742-6596/2340/1/012025 article EN Journal of Physics Conference Series 2022-09-01

Abstract To simulate the expansion of matter created in relativistic nuclear collisions, codes 3+1 dimensions are used and we developing a new one. benchmark such codes, Sod’s shock tube is often used. A closely related problem one-dimensional gas into vacuum. In this paper, study classically relativistically with Smoothed Particle Method test various techniques to improve precision speed solution.

10.1088/1742-6596/2340/1/012024 article EN Journal of Physics Conference Series 2022-09-01
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