【摘 要】
：
A perturbative method of computing the total travel time of both null and lightlike rays in arbitrary static spherically symmetric spacetimes in the weak field limit is proposed.The resultant total time takes a quasi-series form of the impact parameter.Th
【机 构】
：
MOE Key Laboratory of Artificial Micro-and Nano-structures,School of Physics and Technology,Wuhan Un
论文部分内容阅读
A perturbative method of computing the total travel time of both null and lightlike rays in arbitrary static spherically symmetric spacetimes in the weak field limit is proposed.The resultant total time takes a quasi-series form of the impact parameter.The coefficient of this series at a certain order n is shown to be determined by the asymptotic expansion of the metric functions to the order n+1.For the leading order(s),the time delay,as well as the difference between the time delays of two types of relativistic signals,is shown to take a universal form for all SSS spacetimes.This universal form depends on the mass M and a post-Newtonian parameter y of the spacetime.The analytical result is numerically verified using the central black hole of galaxy M87 as the gravitational lensing center.
其他文献
We present a nonextensive version of the Polyakov-Nambu-Jona-Lasinio model that is based on nonex-tentive statistical mechanics.This new statistics model is characterized by a dimensionless nonextensivity parameter q that accounts for all possible effects
Last year,the Ξ(1620) state,which is cataloged in the Particle Data Group (PDG) with only one star,was reported again in the Ξ-π+ final state by the Belle Collaboration.Its properties,such as the spectroscopy and decay width,cannot be simply explained in
In this work,we explore the potentiality of future gravitational wave (GW) and Type Ⅰa supernovae (SNeⅠa) measurements to detect cosmic opacity by comparing the opacity-free luminosity distance (LD) of GW events with the opacity-dependent LD of SNe Ⅰa obs
In this study,we utilize a potentially versatile Bayesian parameter approach to compute the value of the pion charge radius and quantify its uncertainty from several experimental e+e-datasets for the pion vector form factor.We employ dispersion relations
The long-standing Galactic center gamma-ray excess could be explained by GeV dark matter (DM) anni-hilation,but the DM interpretation seems to conflict with recent joint limits from different astronomical scale obser-vations such as dwarf spheroidal galax
This analysis evaluates the possibility of the search for Dark Matter(DM)particles using events with a Z\'heavy gauge boson and a large missing transverse momentum at the Large Hadron Collider(LHC).We consider the muonic decay of Z\'.The analyzed Mont
We review steady spherically symmetric accretion onto a renormalization group improved Schwarz-schild space-time,which is a solution to an asymptotically safe theory (AS) containing high-derivative terms.We use a Hamiltonian dynamical system approach for
Top partners are well motivated in many new physics models.Usually,vector like quarks,TL,R,are in-troduced to circumvent the quantum anomaly.Therefore,it is crucial to probe their interactions with standard model particles.However,flavor changing neutral
Excited states in the odd-A nucleus 71Ga have been studied via the 70Zn(7Li,α2n)71Ga fusion-evapora-tion reaction with incident beam energies of 30 and 35 MeV.The level scheme is established up to spin Iπ=(29/2+)and an excitation energy～6.6 MeV.A previous
The large values and constituent-quark-number scaling of the elliptic flow of low-pT D mesons imply that charm quarks,initially produced through hard processes,might be partially thermalized through strong interac-tions with quark-gluon plasma (QGP) in hi