Nuclear Theory·nucl-th

Wednesday·March 4, 2020

8 papers—3 primary·5 cross-listed

01
Momentum-dependent flow fluctuations as a hydrodynamic response to initial geometry
Maurício Hippert · David Dobrigkeit Chinellato · Matthew Luzum · Jorge Noronha · Tiago Nunes da Silva · Jun Takahashi
We propose a redefinition of the principal component analysis (PCA) of anisotropic flow that makes it more directly connected to fluctuations of the initial geometry of the system. Then, using state-of-the-art hydrodynamic simulations, we make an explicit connection between flow fluctuations and a cumulant expansion of the initial transverse geometry. In particular, we show that the second principal component of elliptic flow is generated by higher-order cumulants, and therefore probes smaller length scales of the initial state. With this information, it will be possible to put new constraints on properties of the early-time dynamics of a heavy-ion collision, including small-scale structure, as well as properties of the quark-gluon plasma.
nucl-thnucl-exNPA(2021)·3 citations
02
Variation after $K$ -projection in antisymmetrized molecular dynamics for low-energy dipole excitations in $^{10}$ Be and $^{16}$ O
Yuki Shikata · Yoshiko Kanada-En'yo
For study of dipole excitations, a new method of variation after $K$ -projection in the framework of antisymmetrized molecular dynamics (AMD) with the deformation $β$ constraint was proposed. The method was applied to $^{10}$ Be and $^{16}$ O to describe low-energy dipole excitations and found to be a useful and economical approach for dipole excitations. In the application to $^{10}$ Be, two dipole states in low-energy region were described. For $^{16}$ O, the $1_{1}^{-}$ and $1_{2}^{-}$ states with remarkable dipole strengths were obtained. The $1_{1}^{-}$ state is characterized by significant toroidal dipole (TD) and compressional dipole strengths, whereas the $1_{2}^{-}$ has significant TD strength and shows a developed $α +^{16}$ O cluster structure. Dipole properties in $^{16}$ O were discussed by analysis of current densities of the dipole transitions.
nucl-thPTEP(2020)·9 citations
03
Does the spin tensor play any role in non-gravitational physics?
F. Becattini (University of Florence)🇮🇹
In view of the recent polarization measurements in ultra-relativistic heavy ion collisions, we discuss the possibility of a physical meaning of the spin angular momentum in quantum field theory and relativistic hydrodynamics.
nucl-thgr-qchep-thNPA(2021)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE

Momentum-dependent flow fluctuations as a hydrodynamic response to initial geometry

Variation after K-projection in antisymmetrized molecular dynamics for low-energy dipole excitations in 10Be and 16O

Does the spin tensor play any role in non-gravitational physics?

Affiliations

Variation after $K$ -projection in antisymmetrized molecular dynamics for low-energy dipole excitations in $^{10}$ Be and $^{16}$ O