Nuclear Theory·nucl-th

Thursday·March 10, 2022

12 papers—8 primary·4 cross-listed

09
[Submitted on 9 Mar 2022] (cross-list from astro-ph.HE)
Merger and post-merger of binary neutron stars with a quark-hadron crossover equation of state
Yong-Jia Huang🇨🇳 · Luca Baiotti🇯🇵 · Toru Kojo🇨🇳 · Kentaro Takami🇯🇵 · Hajime Sotani🇯🇵 · Hajime Togashi🇯🇵 · Tetsuo Hatsuda🇯🇵 · Shigehiro Nagataki🇯🇵 · Yi-Zhong Fan🇨🇳
Fully general-relativistic binary-neutron-star (BNS) merger simulations with quark-hadron crossover (QHC) equations of state (EOSs) are studied for the first time. In contrast to EOSs with purely hadronic matter or with a first-order quark-hadron phase transition (1PT), in the transition region QHC EOSs show a peak in sound speed, and thus a stiffening. We study the effects of such stiffening in the merger and post-merger gravitational (GW) signals. Through simulations in the binary-mass range $2.5 < M / M_{⊙} < 2.75$ , characteristic differences due to different EOSs appear in the frequency of the main peak of the post-merger GW spectrum ( $f_{2}$ ), extracted through Bayesian inference. In particular, we found that (i) for lower-mass binaries, since the maximum baryon number density ( $n_{max}$ ) after the merger stays below $3 - 4$ times the nuclear-matter density ( $n_{0}$ ), the characteristic stiffening of the QHC models in that density range results in a lower $f_{2}$ than that computed for the underlying hadronic EOS and thus also than that for EOSs with a 1PT, (ii) for higher-mass binaries, where $n_{max}$ may exceed $4 - 5 n_{0}$ depending on the EOS model, whether $f_{2}$ in QHC models is higher or lower than that in the underlying hadronic model depends on the height of the sound-speed peak. Comparing the values of $f_{2}$ for different EOSs and BNS masses gives important clues on how to discriminate different types of quark dynamics in the high-density end of EOSs and is relevant to future kilohertz GW observations with third-generation GW detectors.
Comments:
6+8 pages, 5+6 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2203.04528 [pdf]
PRL(2022)·93 citations
10
[Submitted on 9 Mar 2022] (cross-list from hep-th)
Snowmass White Paper: New ideas for many-body quantum systems from string theory and black holes
Mike Blake🇬🇧 · Yingfei Gu🇺🇸 · Sean A. Hartnoll🇬🇧 · Hong Liu🇺🇸 · Andrew Lucas🇺🇸 · Krishna Rajagopal🇺🇸 · Brian Swingle🇺🇸 · Beni Yoshida🇨🇦
During the last two decades many new insights into the dynamics of strongly coupled quantum many-body systems have been obtained using gauge/gravity duality, with black holes often playing a universal role. In this white paper we summarize the results obtained and offer some outlook for future developments, including the ongoing mutually beneficial feedback loop with the study of more general, not necessarily holographic, quantum many-body systems.
Comments:
18+24 pages
Subjects:
High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); nlin.CD (nlin.CD); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2203.04718 [pdf]
20 citations
11
[Submitted on 9 Mar 2022] (cross-list from hep-ph)
Special Issue on Advances in Chiral Quark Models
Jorge Segovia🇪🇸
The number of exotic candidates in both light- and heavy-quark hadron sectors has increased dramatically since the discovery by the Belle Collaboration of the so-called $X (3872)$ in 2003. It is clear that the simple quark model picture needs an extension and thus the last twenty years have witnessed an explosion of related theoretical and experimental activity. The ultimate goal of theory is to describe the properties of exotic states from the first principles of Quantum Chromodynamics (QCD), which is the non-Abelian Quantum Field Theory that describes the strong interaction. However, since this task is quite challenging, a more modest goal to start with is the development of QCD-motivated phenomenological models that specify the colored constituents, how they are clustered, and the forces between them. This Special Issue invited contributions reporting recent advances of phenomenological quark models in the study of hadron's spectrocopy, structure, and interactions, paying special attention to the exotic candidates but without losing sight of the conventional states. In response to the call for papers, and after a comprehensive peer review process, 8 articles qualified for acceptance in the final edition of the Special Issue. The authors are from geographically distributed countries such as Spain, South Africa, Ghana, China, Brazil, Argentina. This reflects the impact of the proposed topic and the effective organization of the guest editorial team of this Special Issue.
Comments:
Editorial of the Special Issue of Symmetry "Advances in Chiral Quark Models"
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2203.04778 [pdf]
Symmetry(2021)·0 citations
12
[Submitted on 9 Mar 2022] (cross-list from hep-ph)
Compositeness of S-wave weakly-bound states from next-to-leading order Weinberg's relations
M. Albaladejo🇪🇸 · J.Nieves🇪🇸
We discuss a model-independent estimator of the likelihood of the compositeness of a shallow S-wave bound or virtual state. The approach is based on an extension of Weinberg's relations in Phys. Rev. 137, B672 (1965) and it relies only on the proximity of the energy of the state to the two-hadron threshold to which it significantly couples. The scheme only makes use of the experimental scattering length and the effective range low energy parameters, and it is shown to be fully consistent for predominantly molecular hadrons. As explicit applications, we analyse the case of the deuteron, the $^{1} S_{0}$ nucleon-nucleon virtual state and the exotic $D_{s 0}^{*} (2317)^{\pm}$ , and find strong support to the molecular interpretation in all cases. Results are less conclusive for the $D_{s 0}^{*} (2317)^{\pm}$ , since the binding energy of this state is significantly higher than that of the deuteron, and the approach employed here is at the limit of its applicability. We also qualitatively address the case of the recently discovered $T_{cc}^{+}$ state, within the isospin limit to avoid the complexity of the very close thresholds $D^{0} D^{*+}$ and $D^{+} D^{* 0}$ , which could mask the ingredients of the approach proposed in this work.
Comments:
Reviewed version matching the published one
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2203.04864 [pdf]
EPJC(2022)·55 citations

Affiliations

first authorsco-authorsvia INSPIRE

Merger and post-merger of binary neutron stars with a quark-hadron crossover equation of state

Snowmass White Paper: New ideas for many-body quantum systems from string theory and black holes

Special Issue on Advances in Chiral Quark Models

Compositeness of S-wave weakly-bound states from next-to-leading order Weinberg's relations

Affiliations