Article
Physics, Multidisciplinary
Yong-Jia Huang, Luca Baiotti, Toru Kojo, Kentaro Takami, Hajime Sotani, Hajime Togashi, Tetsuo Hatsuda, Shigehiro Nagataki, Yi-Zhong Fan
Summary: This study investigates fully general-relativistic binary-neutron-star merger simulations with quark-hadron crossover equations of state for the first time and analyzes the characteristic differences in the gravitational wave signals. The results are important for discriminating between different types of quark dynamics and future kilohertz gravitational wave observations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Hiroyuki Tajima, Shoichiro Tsutsui, Takahiro M. Doi, Kei Iida
Summary: We discuss the hadron-quark crossover accompanied by the formation of Cooper triples and draw an analogy with the Bardeen-Cooper-Schrieffer crossover in fermionic systems. This crossover, unlike a phase transition, does not involve symmetry breaking. We calculate the in-medium three-body energy using a phenomenological three-body force and observe a smooth crossover from the hadronic bound-state pole to the Cooper triple phase as density increases. The coexistence of three-body clusters and quark Fermi sea in the crossover is also related to the quarkyonic matter model.
Article
Astronomy & Astrophysics
F. Anzuini, A. Melatos, C. Dehman, D. Vigano, J. A. Pons
Summary: This study discusses the need for internal heating sources in neutron star models to reconcile theoretical cooling rates with observational data, focusing on moderately magnetized, isolated thermally emitting stars. By considering different internal heating mechanisms, the study finds that neutron star models can match observations of such stars through proper internal heating.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Hao-Jui Kuan, Arthur G. Suvorov, Daniela D. Doneva, Stoytcho S. Yazadjiev
Summary: Many extended scalar-tensor theories suggest that dynamical instabilities at high energies can lead to the formation of scalarized neutron stars. These scalarized stars have lower maximum mass and central energy density compared to Einstein ones. A gravitational phase transition can occur when a scalarized star overaccretes beyond the critical mass limit, resulting in bursts of radiation detectable by interferometer networks.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Nuclear
Chengjun Xia, Zhenyu Zhu, Xia Zhou, Ang Li
Summary: The study investigates the properties of sound velocity and adiabatic index of dense matter in compact stars, including hybrid stars, neutron stars, and quark stars. It is found that factors leading to the behavior of sound velocity include nonperturbative properties of the quark phase in addition to a deconfinement phase transition. A new class of quark star equation of states is proposed and can be tested through high-precision radius measurements of pulsar-like objects in the future.
Article
Astronomy & Astrophysics
Grant J. Mathews, Atul Kedia, Hee Il Kim, In-Saeng Suh
Summary: This paper summarizes recent work on the possible gravitational-wave signal from binary neutron-star mergers and how the power spectral density function can be used to detect the crossover transition to quark matter.
Article
Physics, Nuclear
Bo-Lin Li, Yan Yang, Jia-Lun Ping
Summary: Researchers have constructed a new set of hybrid equations of state that describe the transition from low-density hadronic matter to high-density strange quark matter. By incorporating nonperturbative features of quantum chromodynamics, they found that the presence of strange quark matter makes the equation of state softer. The hybrid stars formed from this equation of state are more compact than neutron stars and have smaller tidal deformabilities.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Choki Nakamoto
Summary: The study found that the strong repulsive three-body effect from the color-magnetic term plays a crucial role in solving the hyperon puzzle in the quark model.
Article
Astronomy & Astrophysics
Lazaros Tsaloukidis, P. S. Koliogiannis, A. Kanakis-Pegios, Ch. C. Moustakidis
Summary: In this study, the internal structure of compact stars and the possibility of a first-order transition resulting in the creation of twin stars are explored. The phase transition is analyzed using the Maxwell and Gibbs constructions, and the gravitational mass, radius, and tidal deformability of hybrid stars are compared with observational data from LIGO/VIRGO Collaboration's GW170817 event. The study also includes considerations of the effects of rotation on twin star configurations and the constraints imposed by the discovery of the supermassive pulsar PSR J0952-0607 and the compact object within the supernova remnant HESS J1731-347.
Article
Astronomy & Astrophysics
Vittorio De Falco, Maciek Wielgus
Summary: This study further explores the three-dimensional general relativistic Poynting-Robertson effect in the motion around compact objects, discussing the effects of radiation pressure and radiation drag force, investigating the properties of critical hypersurfaces, and demonstrating how this model can be applied to radiation phenomena near neutron stars.
Article
Astronomy & Astrophysics
K. M. Rajwade, J. van den Eijnden
Summary: Recent observations suggest that repeating FRBs may originate from binary systems with a highly energetic neutron star and a massive companion star. We investigated the host galaxy properties, binary formation rates, rotation and dispersion measure evolution, birth site offsets, and the origin of persistent radio emission. The results indicate a preference for neutron star-massive star binary systems in host galaxies, but more discoveries and localizations are needed for conclusive evidence. The birth rate of considered binaries significantly exceeds the estimated rate of FRBs, suggesting that only a small subset of these systems produce FRBs.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Physics, Multidisciplinary
Matteo Fael, Fabian Lange, Kay Schoenwald, Matthias Steinhauser
Summary: This article calculates the three-loop nonsinglet corrections to the photon-quark form factors, considering the virtuality of the photon and the quark mass. By combining the method of differential equations with expansions around regular and singular points, the results for the form factors are obtained with an accuracy of about eight to twelve digits in the whole kinematic range.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Alakabha Datta, Hongkai Liu, Danny Marfatia
Summary: We calculate the complete differential decay distributions for B meson decays to a massive right-handed neutrino in the low-energy effective field theory framework. We find that a massive right-handed neutrino can cause significant distortions in angular observables. We also make predictions for q2 dependent angular observables to motivate future measurements.
Article
Astronomy & Astrophysics
E. Laplace, S. Justham, M. Renzo, Y. Gotberg, R. Farmer, D. Vartanyan, S. E. de Mink
Summary: The majority of massive stars live in binary or multiple systems, and interactions with companions can result in systematic differences in the pre-supernova structures, core density, and nuclear energy generation profiles. These differences may lead to systematically different supernova yields.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Bo-Lin Li, Yan Yan, Guang-Zhen Kang, Jia-Lun Ping
Summary: The properties of hybrid stars are studied using hybrid EOSs that satisfy astrophysical observations. The maximum masses and tidal deformabilities of hybrid stars are found to meet the constraints, and the combined tidal deformability increases with mass ratio.
MODERN PHYSICS LETTERS A
(2022)
Article
Astronomy & Astrophysics
Ryosuke Yanagihara, Takumi Iritani, Masakiyo Kitazawa, Masayuki Asakawa, Tetsuo Hatsuda
Article
Physics, Multidisciplinary
E. Hiyama, K. Sasaki, T. Miyamoto, T. Doi, T. Hatsuda, Y. Yamamoto, Th A. Rijken
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Nuclear
Aaron Park, Su Houng Lee, Takashi Inoue, Tetsuo Hatsuda
EUROPEAN PHYSICAL JOURNAL A
(2020)
Article
Astronomy & Astrophysics
Shinya Gongyo, Kenji Sasaki, Takaya Miyamoto, Sinya Aoki, Takumi Doi, Tetsuo Hatsuda, Yoichi Ikeda, Takashi Inoue, Noriyoshi Ishii
Article
Multidisciplinary Sciences
Hirotaka Irie, Haozhao Liang, Takumi Doi, Shinya Gongyo, Tetsuo Hatsuda
Summary: A novel quantum-classical hybrid scheme is proposed to efficiently tackle large-scale combinatorial optimization problems by introducing Hamiltonian dynamics of classical flux variables associated with quantum spins. Classical flux molecular dynamics can effectively sort out frozen and ambivalent spins for quantum annealers, demonstrating superior performance compared to standard classical algorithms like tabu search and simulated annealing in MAX-CUT and Ising spin-glass problems.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Akira Ohnishi, Y. Kamiya, K. Sasaki, T. Fukui, T. Hatsuda, T. Hyodo, K. Morita, K. Ogata
Summary: The study utilized the baryon-baryon potentials obtained from lattice QCD calculations to analyze the momentum correlation functions of p Xi(-) and Lambda Lambda pairs in high-energy nuclear collisions. The results accurately represented the correlation function data from pp and pPb collisions, confirming the validity of the S = -2 baryon-baryon potentials and providing support for the existence of the H dibaryon as a virtual state near the N Xi threshold.
Article
Physics, Multidisciplinary
Yan Lyu, Hui Tong, Takuya Sugiura, Sinya Aoki, Takumi Doi, Tetsuo Hatsuda, Jie Meng, Takaya Miyamoto
Summary: A pair of triply charmed baryons, Omega(ccc)Omega(ccc), is studied as an ideal dibaryon system, revealing that they are located in the unitary regime with short scattering length and small effective range.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Toru Kojo, Gordon Baym, Tetsuo Hatsuda
Summary: The recent NICER measurement of the radius of the neutron star PSR J0740+6620 shows that the equation of state of neutron star matter has key features. In the regime of baryon density 2-4 times nuclear saturation density, the pressure rises rapidly, indicating the possible transformation of hadronic matter into quark matter. The resulting equation of state, QHC21, predicts larger radii in substantial agreement with the NICER data.
ASTROPHYSICAL JOURNAL
(2022)
Article
Physics, Multidisciplinary
Yong-Jia Huang, Luca Baiotti, Toru Kojo, Kentaro Takami, Hajime Sotani, Hajime Togashi, Tetsuo Hatsuda, Shigehiro Nagataki, Yi-Zhong Fan
Summary: This study investigates fully general-relativistic binary-neutron-star merger simulations with quark-hadron crossover equations of state for the first time and analyzes the characteristic differences in the gravitational wave signals. The results are important for discriminating between different types of quark dynamics and future kilohertz gravitational wave observations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Yixin Guo, Hiroyuki Tajima, Tetsuo Hatsuda, Haozhao Liang
Summary: This paper theoretically examines the continuity between atomic and molecular Fermi superfluids in a Bose-Fermi mixture near the Feshbach resonance. A mean-field framework is constructed based on the perturbative expansion of the b-f-F Feshbach coupling in a two-channel model. The resulting effective Hamiltonian exhibits a continuity between atom-atom to molecule-molecule Cooper pairings and becomes equivalent to the two-band-superconductor model with a pair-exchange coupling.
Article
Astronomy & Astrophysics
Yan Lyu, Hui Tong, Takuya Sugiura, Sinya Aoki, Takumi Doi, Tetsuo Hatsuda, Jie Meng, Takaya Miyamoto
Summary: Optimized interpolating operators are constructed using the HAL QCD method, which are dominantly coupled to each eigenstate of two baryons. The validity of these operators is tested by considering heavy dibaryons??3Q??3Q (Q = s, c) calculated by (2 + 1)-flavor lattice QCD simulations. The results show that the optimized operators provide effective energies of the ground and excited states and can reliably extract the potential V(r).
Article
Physics, Nuclear
Y. Kamiya, K. Sasaki, T. Fukui, T. Hyodo, K. Morita, K. Ogata, A. Ohnishi, T. Hatsuda
Summary: Investigation of momentum correlation functions of S = -2 baryon pairs in high-energy collisions shows that the NΞ (ΛΛ) interaction is moderately (weakly) attractive, without forming a quasi-bound (bound) state.
Article
Astronomy & Astrophysics
Ryosuke Yanagihara, Masakiyo Kitazawa, Masayuki Asakawa, Tetsuo Hatsuda
Article
Physics, Nuclear
Kenji Sasaki, Sinya Aoki, Takumi Doi, Shinya Gongyo, Tetsuo Hatsuda, Yoichi Ikeda, Takashi Inoue, Takumi Iritani, Noriyoshi Ishii, Keiko Murano, Takaya Miyamoto
Article
Physics, Nuclear
Kenji Morita, Shinya Gongyo, Tetsuo Hatsuda, Tetsuo Hyodo, Yuki Kamiya, Akira Ohnishi