Inspired by the recent experimental breakthrough in identifying the last bound neutron-rich nuclei in the fluorine and neon isotopes, we perform a theoretical study of the Z = 9, 10, 11, 12 isotopes in the relativistic mean field model. The mean field parameters are those of the PK1 parameterization while the pairing correlation is described by the particle number conservation BCS (FBCS) method recently formulated in the RMF model. We show that the FBCS approach plays an essential role in reproducing the experimental results of the fluorine and neon isotopes. In addition, we predict 39Na and 40Mg to be the last bound neutron-rich nuclei in the sodium and magnesium isotopes.
Using the latest PandaX limits on light dark matter (DM) with light mediator, we check the implication on the parameter space of the general singlet extension of MSSM (without Z3 symmetry), which can have a sizable DM self-interaction to solve the small-scale structure problem. We find that the PandaX limits can stringently constrain such a paramter space, depending on the coupling λ between the singlet and doublet Higgs fields. For the singlet extension of MSSM with Z3 symmetry, the so-called NMSSM, we also demonstrate the PandaX constraints on its parameter space which gives a light DM with correct relic density but without sufficient self-interaction to solve the small-scale structure problem. We find that in this NMSSM the GeV dark matter with a sub-GeV mediator has been stringently constrained.
We propose a new method to test the cosmic distance duality relation using the strongly lensed gravitational waves. The simultaneous observations of image positions, the relative time delay between different images, the redshift measurements of lens and source, together with the mass modelling of the lens galaxy, provide the angular diameter distance to the gravitational wave source. On the other hand, from the observation of gravitational wave signals the luminosity distance to the source can be obtained. This is to our knowledge the first method to simultaneously measure both the angular diameter distance and luminosity distance from the same source. Thus, the strongly lensed gravitational waves provide a unique way to test the cosmic distance duality relation. With the construction of the third generation gravitational detectors such as the Einstein Telescope in the future, it is possible to test the cosmic distance duality relation at an accuracy of several percent.
Starting from deformed AdS5 spaces due to the presence of modified warp factors in their metric tensors, we use the AdS/CFT correspondence within this approach to calculate the spectra for even and odd glueballs, scalar and vector mesons, and baryons with different spins. For the glueball cases we derive their Regge trajectories and compare with the ones related to the pomeron and the odderon. In the case of the scalar and vector mesons and baryons the masses found here are compatible with the PDG. In particular for these hadrons we found Regge trajectories compatible with another holographic approach and also with the hadronic spectroscopy which present an universal Regge slope around 1.1 GeV2.
In this paper, we have discussed the
Precise measurement about the cosmic-ray (CR) knees of different primaries is essential for revealing the mistery of CR's acceleration and propagation mechanism, as well as exploring new physics. However, classification about the CR components is a tough task especially for the groups with the atomic number close to each other. Realizing that deep learning has achieved a remarkable breakthrough in many fields, we seek for leveraging this technology to improve the classification performance of the CR Proton and Light groups of the LHAASO-KM2A experiment. In this work, we propose a fused Graph Neural Network model for the KM2A arrays, in which the activated detectors are structured into graphs. We find that the signal and background can be effectively discriminated in this model, and its performance outperforms both the traditional physics-based method and the Convolutional Neural Network (CNN)-based model across the whole energy range.
In this paper, we study the matter accretion onto Einstein-Aether black holes by adopting the Hamiltonian approach. We discuss the general solution of accretion using isothermal equation of state. Particularly, we consider different types of fluids such as ultra-relativistic fluid, ultra-stiff fluid, sub-relativistic fluid, radiation fluid and analyzed its accretion process onto Einstein-Aether black holes. The behavior of fluid flow and existence of critical points is being checked for Einstein-Aether black holes. We also discuss the general expression and behavior of polytropic fluid onto Einstein-Aether black holes. The most important feature of this work is to investigate the mass accretion rate of above mentioned fluids and compare our finding with Schwarzschild black hole which produce particular signatures. Moreover, the maximum mass accretion rate occur near the Killing and universal horizons and minimum accretion rate lies in between it.
In this paper, we revisit the heavy quarkonium leptonic decays
Exact solution of the U(5)-O(6) transitional description in the interacting boson model with two-particle and two-hole configuration mixing is derived based on the Bethe ansatz approach. The Bethe ansatz equations in determining eigenstates and the corresponding eigen-energies of the model are provided. Specific N=2 and N=4 cases are exemplified to demonstrate the feature of the solution. As an example of the application, some low-lying level energies and B(E2) ratios of 108Cd are fitted and compared with the corresponding experimental data.
In the semi-constrained NMSSM (scNMSSM, or NMSSM with non-universal Higgs mass) under current constraints, we consider a scenario where
A number of predictions were made in Ref. [
We propose a cosmological scenario which describes the evolution history of the universe based on the particle creation and holographic equipartition. The model attempts to solve the inflation of the early universe and the accelerated expansion of the present universe without introducing the dark energy from the perspective of thermodynamics. Throughout the evolution of the universe, we assume that the universe always creates particles in some way and holographic equipartition is always satisfied. Further, we choose that the creation rate of particles is proportional to
In this paper, we studied the semileptonic
We study the collision property of spinning particles near a Bañados-Teitelboim-Zanelli (BTZ) black hole. Our results show that although the center-of-mass energy of two ingoing particles diverges if one of the particles possesses a critical angular momentum, however, particle with critical angular momentum can not exist outside of the horizon due to the violation of timelike constraint. Further detailed investigation indicates that only a particle with a subcritical angular momentum is allowed to exist near an extremal rotating BTZ black hole and the corresponding collision center-of-mass energy can be arbitrarily large in a critical angular momentum limit.
In this paper, we study the prospect for using the low-redshift and high-redshift black hole shadows as a new cosmological standard ruler to measure the cosmological parameters. We show that, using the low-redshift observation of the black hole shadow of M87*, the Hubble constant can be independently measured at the precision of about 13%, with the measurement result
This paper extends the study of the quantum dissipative effects of a cosmological scalar field by taking into account the cosmic expansion and contraction. Cheung, Drewes, Kang and Kim [
The Water Cherenkov Detector Array (WCDA) is a major component of the Large High Altitude Air Shower Array Observatory (LHAASO), a new generation cosmic-ray experiment with unprecedented sensitivity, currently under construction. The WCDA is aimed at the study of TeV
Asymptotically safe gravity is one effective approach to quantum gravity. It is important to differentiate the modified gravity inspired by asymptotically safe gravity. In this paper, we examine the matter particles dynamics near the improved version of Schwarzschild black hole. We assume that in the context of asymptotically safe gravity scenario the ambient matter surrounding the black hole is of isothermal in nature and investigate the spherical accretion of matter by deriving solutions at critical points. The analysis for the various values of the state parameter for isothermal test fluids, viz., k = 1, 1/2, 1/3, 1/4 show the possibility of accretion onto asymptotically safe black hole. We formulate the accretion problem as Hamiltonian dynamical system and explain its phase flow in detail which reveals interesting results in asymptotically safe gravity theory.
Using several source models, we analyze the transverse momentum dependence of HBT radii in the relativistic heavy-ion collisions. The results indicate that the single-particle space-momentum angle distribution plays an important role in the transverse momentum dependence of HBT radii. In a cylinder source, we use several formulas to describe the transverse momentum dependence of HBT radii and the single-particle space-momentum angle distribution. We also make a numerical connection between them in the transverse plane.
The first law of black hole thermodynamics in the extended phase space is prevailing recently. However, the second law as well as the weak cosmic censorship conjecture has not been investigated extensively. In this paper, we investigate the laws of thermodynamics and the weak cosmic censorship conjecture of an AdS black hole with a global monopole in the extended phase space under a charged particle absorption. It is shown that the first law of thermodynamics is valid, while the second law is violated for the extremal and near-extremal black holes. Moreover, for the weak cosmic censorship conjecture, we find it is valid only for the extremal black holes, and it is violable for the near-extremal black hole, which is different from the previous results.
We construct an alternative uniformly accelerated reference frame based on 3+1 formalism in adapted coordinate. It is distinguished with Rindler coordinate that there is time-dependent redshift drift between co-moving observers. The experimentally falsifiable distinguishment might promote our understanding of non-inertial frame in laboratory.
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