We will study the Spin Alignment and Phase Structure of Thermal QGP under Rotation with high energy heavy-ion collisions.And then,we will investigate the Anomalous Magnetic Moment and Phase Transition of the Magnetized QCD Background; The Rotation Effect on the Deconfinement Phase Transition are investigated with Holographic QCD method. And finally, we make Summary and Conclusions.
Recent lattice QCD simulations have further validated their earlier unusual findings: The lowest energies of charged pseudoscalar mesons $\pi^\pm$ and $K^\pm$ decrease at stronger magnetic field, though quasiparticle approximation assumes an increasing feature. We address this long-standing puzzle by employing the chiral effective Weinberg model, in which pseudoscalar and vector mesons exhibit...
In this talk, I will report our recent study of the thermodynamics of accelerated pure gluonic matter. We investigate the one-loop Polyakov-loop effective potential in uniformly accelerated systems, where acceleration serves as an external parameter for the confinement--deconfinement transition. We compare thermodynamic quantities obtained in the Rindler frame with those in the conformally...
The production of light nuclei and hypernuclei in relativistic heavy-ion collisions provides a unique opportunity to investigate the formation mechanism of loosely bound states and the structure of hypernuclei. In particular, coalescence models predict a strong suppression of hypertriton (${}^{3}_{\Lambda}\mathrm{H}$) production relative to ${}^{3}\mathrm{He}$ in small collision systems...
Lee-Yang edge singularities (LYEs) are singularities that limit the analyticity of the thermodynamic potential in the complex chemical potential plane and provide important information on the phase structure. In this work, we extend the functional renormalization group approach for the PQM model to the complex chemical potential plane and investigate its analytic structure. We identify the...
Studies of light nucleus production, including deuterons, and helium nuclei, in heavy-ion collisions are essential for understanding the dynamics of nuclear matter under extreme conditions and provide valuable insights into the underlying equation of state. Compound yield ratios, such as $\rm N_t \times N_p/N_d^2$ and $\rm N_{^4He} \times N_p / (N_{^3He} \times N_d)$, have been proposed as...
Neutron-star measurements constrain the
pressureโenergy-density relation but leave the micro-
scopic composition of dense matter unresolved. A poly-
tropic index ฮฮต < 1.75 and sound speed C2
s = 1/3 have
both been used as signatures of quark degrees of free-
dom. We test these interpretations by calibrating a nu-
cleonic reference domain in the (ฮฮต, P/Pfree) plane. A
Taylor metamodel...
In relativistic heavy-ion collisions, the collision centrality is conventionally determined by sorting events into percentile bins of charged-particle multiplicity.
The procedure is applied to a stochastic relation between multiplicity and initial geometry.
The associated finite volume fluctuation is therefore irreducible and introduce an inevitable uncertainty, impacting many...
Heavy-ion collisions are studied to probe hot, dense nuclear matter, known as the quarkโgluon plasma (QGP). While flow-like signatures observed in pp and pโPb collisions at the LHC suggest that QGP-like behavior may emerge even in small systems, jet quenching has so far remained unobserved in such collisions. To better understand the transition between small and large collision systems, the...
We study the Chiral Magnetic Effect (CME) in relativistic heavy-ion collisions using charge fluctuations and their correlations generated in the early stages of the collision. Employing the 2+1 flavor Polyakov-loop-extended NambuโJona-Lasinio (PNJL) model, we compute the charge separation associated with the CME. A central challenge in interpreting these correlations experimentally is...
The deuteron carries baryon number two and is abundantly produced in the baryon-rich matter created in heavy-ion collisions. Its number fluctuations can provide insight into QCD matter at high baryon density and may be sensitive to critical-point physics. Since deuterons are formed from nucleons, their fluctuations are closely connected to baryon-density fluctuations and can complement...
Femtoscopic correlation measurements provide a unique tool to investigate the space-time structure of particle-emitting sources created in high-energy collisions. Using quantum statistical effects and final-state interactions between particles, femtoscopic analyses offer direct access to the source size, emission dynamics, and collective behavior of the produced matter on the femtometer scale....
We discuss numerical simulations of relativistic spin hydrodynamics solved by physics-informed neural networks (PINNs) [1]. We take advantage of PINNs to explicitly impose the total angular momentum, i.e., the sum of orbital and spin angular momentum, accurately conserved by including the conservation law directly in the loss function as a training target. This enables controlled numerical...
The expansion dynamics and transport properties of the quark-gluon plasma (QGP) are essential for understanding the evolution of matter created in relativistic heavy-ion collisions [1โ5]. In particular, comparisons between different collision systems provide a powerful way to isolate the system-size dependence of collective expansion and its fluctuations, thereby improving sensitivity to the...
Event-by-event mean transverse momentum ($p_{\rm T}$) fluctuations provide insight into the initial-state geometry fluctuations, the thermodynamic properties, and the collective evolution of hot and dense QCD matter. In this talk, we will present STAR measurements of event-by-event mean $p_{\rm T}$ fluctuations in Au+Au collisions from the Beam Energy Scan programs, covering collider-mode as...
We report the first measurements of two-particle transverse-momentum correlations (variance) for midrapidity charged particles in fixed-target Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=3.0$--$7.7$ GeV using data collected by STAR during the Beam Energy Scan Phase II program [1]. Combined with previous BES-I measurements at $\sqrt{s_{\mathrm{NN}}}=7.7$--$200$ GeV [2], the relative dynamical...
Fluctuations of conserved quantities are proposed as sensitive observables to search for the QCD critical point in heavy-ion collisions. Recently, the STAR experiment has conducted precision measurement of net-proton fluctuations in Au+Au collisions at โsNN = 7.7 โ 27 GeV, during the RHIC Beam Energy Scan II program [1] and reported the preliminary results of proton number fluctuation in...
We investigate the global spin polarization of $\Lambda$ hyperons and the multi-strange hyperons $\Xi^{-}$ and $\Omega^{-}$ in Au+Au collisions across the RHIC Beam Energy Scan II (BES-II) energy range, $\sqrt{s_{NN}}=7.7$--$27$ GeV. The polarization is computed using the modified Cooper--Frye formula, which includes contributions from thermal vorticity, the thermal shear tensor, and the...
In this talk I will present a study of static quark--antiquark interactions in rotating SU(3) gluodynamics using quenched lattice simulations at imaginary angular velocity. At zero temperature, we extract the static potential from Wilson loops for quark--antiquark pairs aligned with the rotation axis, for transverse pairs with one source on the rotation axis, and for symmetric transverse pairs...
The distribution of particles is highly anisotropic in the initial stage of a heavy-ion collision. We demonstrate that this anisotropy induces a sizable effect on the spin alignment of vector mesons. We study two different production mechanisms for ฯ and Kโ0 mesons, on one hand the coalescence of quarks and on the other that of pseudoscalar mesons. In the quark-coalescence picture where ฯ and...
The longitudinal local polarization $(P_{z,s2})$ of $\Lambda$ and $\bar{\Lambda}$ hyperons exhibits a second-harmonic azimuthal modulation that is closely related to the anisotropic expansion and velocity-gradient structure of the produced medium. Measurements of local polarization in 200 GeV Au + Au and isobar collisions at RHIC exhibit similar centrality dependence, increasing in more...
Understanding the origin of prompt D0 meson elliptic flow helps us to learn how charm quarks interact with the quark-gluon plasma (QGP), with the initial state determined by the event-by-event collision geometry. The event shape-dependent elliptic flow can be understood in detail using the event shape engineering (ESE) technique. ESE correlates light hadron elliptic flow, a proxy for the...
We develop a general holographic framework for computing thermal spectral functions of exotic spinโ$1$ mesons. A bulk Proca mass encodes the canonical ultraviolet dimension of the interpolating operator, allowing channels with different ultraviolet scaling to be treated within a unified membrane flow formalism in the zero-spatial-momentum limit. We test this framework in a soft-wall model with...
Linearly polarized quasireal photons from relativistic heavy ions can transfer their polarization to coherently photoproduced vector mesons, producing a second-harmonic modulation in their decay angular distributions. A positive modulation has been observed for spin-0 pions from coherent $\rho^{0}$ decays, using the $\rho^{0}$ transverse momentum direction as the polarization reference, while...
Spin correlation is believed to be a significant contribution to vector meson spin alignment. In this work, we study the generation of spin correlation through fluctuations of the chromomagnetic field in the quark-gluon plasma medium. We show that anisotropic fluctuations generically lead to finite spin alignment of vector mesons. We study two sources of anisotropic chromomagnetic field...
The neutron skin thickness in neutron-rich nuclei has traditionally been measured using low-energy hadronic and electronic scatterings at hadronic level. In this paper, we propose a novel probe of the neutron skin thickness through deep inelastic scattering in high-energy electron-ion collisions, leveraging the intrinsic correlation between final-state jet charge distribution and initial-state...
Recent theoretical advances have shown that collective flow imparts a large asymmetry to both the momentum broadening distribution and the medium-induced radiation spectrum of jet partons. In this work, we present the first inclusion of the full flow-induced anisotropic radiation spectrum in a heavy ion jet Monte Carlo as a large scale overhaul of the open-source [APE (Anisotropic Partonic...
We present a QCD analysis of pion nuclear fragmentation functions (nFFs), which encode nuclear modifications to hadronization in high-energy nuclear collisions. Within this framework, vacuum fragmentation functions and their nuclear modifications are extracted simultaneously. The nuclear effects are parameterized as functions of the mass number $A$, the energy of the fragmenting parton in the...
