Nuclear Theory·nucl-th

Friday·August 25, 2023

5 papers—2 primary·3 cross-listed

03
Nuclear physics constraints from binary neutron star mergers in the Einstein Telescope era
Francesco Iacovelli🇨🇭 · Michele Mancarella🇮🇹 · Chiranjib Mondal🇫🇷 · Anna Puecher🇳🇱 · Tim Dietrich🇩🇪 · Francesca Gulminelli🇫🇷 · Michele Maggiore🇨🇭 · Micaela Oertel🇫🇷
The next generation of ground-based gravitational-wave detectors, Einstein Telescope (ET) and Cosmic Explorer (CE), present a unique opportunity to put constraints on dense matter, among many other groundbreaking scientific goals. In a recent study the science case of ET was further strengthened, studying in particular the performances of different detector designs. In this paper we present a more detailed study of the nuclear physics section of that work. In particular, focusing on two different detector configurations (the single-site triangular-shaped design and a design consisting of two widely separated "L-shaped" interferometers), we study the detection prospects of binary neutron star (BNS) mergers, and how they can reshape our understanding of the underlying equation of state (EoS) of dense matter. We employ several state-of-the-art EoS models and state-of-the-art synthetic BNS merger catalogs, and we make use of the Fisher information formalism (FIM) to quantify statistical errors on the astrophysical parameters describing individual BNS events. To check the reliability of the FIM method, we further perform a full parameter estimation for a few simulated events. Based on the uncertainties on the tidal deformabilities associated to these events, we outline a mechanism to extract the underlying injected EoS using a recently developed meta-modelling approach within a Bayesian framework. Our results suggest that with $≳ 500$ events with signal-to-noise ratio greater than $12$ , we will be able to pin down very precisely the underlying EoS governing the neutron star matter.
↳ gr-qcastro-ph.HEnucl-thPRD(2023)·61 citations
04
Virtual states in the coupled-channel problems with an improved complex scaling method
Yan-Ke Chen🇨🇳 · Lu Meng🇩🇪 · Zi-Yang Lin🇨🇳 · Shi-Lin Zhu🇨🇳
We improve the complex scaling method (CSM) to obtain virtual states, which were previously challenging in the conventional CSM. Our approach solves the Schrödinger equation in the momentum space as an eigenvalue problem by choosing the flexible contours. It proves to be highly effective in identifying the poles across the different Riemann sheets in the multichannel scatterings. It is more straightforward and efficient than searching for the zeros of the Fredholm determinant of the Lippmann-Schwinger equation using the root-finding algorithms. This advancement significantly extends the capabilities of the CSM in accurately characterizing the resonances and virtual states in quantum systems.
↳ hep-phhep-latnucl-thphysics.atom-ph+1PRD(2024)·21 citations
05
Inverse magnetic catalysis effect and current quark mass effect on mass spectra and Mott transitions of pions under external magnetic field
Luyang Li🇨🇳 · Shijun Mao🇨🇳
Mass spectra and Mott transition of pions $(π^{0}, π^{\pm})$ at finite temperature and magnetic field are investigated in a two-flavor NJL model, and we focus on the inverse magnetic catalysis (IMC) effect and current quark mass (CQM) effect. Due to the dimension reduction of the constituent quarks, the pion masses jump at their Mott transitions, which is independent of the IMC effect and CQM effect. We consider the IMC effect by using a magnetic dependent coupling constant, which is a monotonic decreasing function of magnetic field. With IMC effect, the Mott transition temperature of $π^{0}$ meson $T_{m}^{0}$ is a monotonic decreasing function of magnetic field. For charged pions $π^{\pm}$ , the Mott transition temperature $T_{m}^{+}$ fast increases in weak magnetic field region and then decreases with magnetic field, which are accompanied with some oscillations. Comparing with the case without IMC effect, $T_{m}^{0}$ and $T_{m}^{+}$ are lower when including IMC effect. CQM effect are considered by varying parameter $m_{0}$ in non-chiral limit. For $π^{0}$ meson, $T_{m}^{0}$ is not a monotonic function of magnetic field with low $m_{0}$ , but it is a monotonic decreasing function with larger $m_{0}$ . In the weak magnetic field region, $T_{m}^{0}$ is higher for larger $m_{0}$ , but in the strong magnetic field region, it is lower for larger $m_{0}$ . For $π^{+}$ meson, $T_{m}^{+}$ is only quantitatively modifies by current quark mass effect, and it becomes higher with larger $m_{0}$ .
↳ hep-phnucl-thPRD(2023)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE

Nuclear physics constraints from binary neutron star mergers in the Einstein Telescope era

Virtual states in the coupled-channel problems with an improved complex scaling method

Inverse magnetic catalysis effect and current quark mass effect on mass spectra and Mott transitions of pions under external magnetic field

Affiliations