【摘 要】
：
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
【机 构】
：
Escuela de Física,Universidad Nacional de Colombia,A.A.3840,Medellín,Colombia
论文部分内容阅读
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 the analysis of the accretion of four types of isothermal test fluids:ultra-stiff fluid,ultra-relativistic fluid,radiation fluid,and sub-relativistic fluid.An important outcome of our study is that,contrary to the claim in a recent work,there are physical solutions for the accretion of an ultra-relativistic flu-id in AS,which include subsonic,supersonic,and transonic regimes.Furthermore,we study quantum corrections to the known stability of the accretion in general relativity (GR).To this end,we use a perturbative procedure based on the continuity equation with the mass accretion rate being the perturbed quantity.Two classes of perturbations are studied:standing and traveling waves.We find that quantum gravity effects either enhance or diminish the stability of the accretion depending on the type of test fluid and the radial distance to the central object.
其他文献
In this study,we choose the scalar and axialvector diquark operators in the color antitriplet as the funda-mental building blocks to construct four-quark currents and investigate the diquark-antidiquark type axialvector tet-raquark states c(c)u(s) in the
To explore the properties of neutron-rich nuclei with approximately 40 protons,the density-dependent point coupling (DD-PC1) effective interaction parameter is adopted in the relativistic mean-field theory with the complex momentum representation (RMF-CMR
The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the pre-cision era.The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the Daya Bay experiment,in combinatio
We present a systematic determination of the responses of PandaX-Ⅱ,a dual phase xenon time projec-tion chamber detector,to low energy recoils.The electron recoil (ER) and nuclear recoil (NR) responses are calib-rated,respectively,with injected tritiated m
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