We study quasinormal modes(QNMs)of charged black holes in the Einstein-Maxwell-Weyl(EMW)gravity by adopting the test scalar field perturbation.We find that the imaginary part of QNM frequencies is consistently negativ...We study quasinormal modes(QNMs)of charged black holes in the Einstein-Maxwell-Weyl(EMW)gravity by adopting the test scalar field perturbation.We find that the imaginary part of QNM frequencies is consistently negative for different angular parameters l,indicating that these modes always decay and are therefore stable.We do not observe a linear relationship between the QNM frequencyωand parameter p for these black holes,as their charge Q causes a nonlinear effect.We evaluate the massive scalar field perturbation in charged black holes and find that random long lived modes(i.e.,quasiresonances)could exist in this spectrum.展开更多
In this work,we study the optical properties of a class of magnetically charged rotating black hole spacetimes.The black holes in question are assumed to be immersed in the quintessence field,and subsequently,the resu...In this work,we study the optical properties of a class of magnetically charged rotating black hole spacetimes.The black holes in question are assumed to be immersed in the quintessence field,and subsequently,the resulting black hole shadows are expected to be modified by the presence of dark energy.We investigate the photon region and the black hole shadow,especially their dependence on the relevant physical conditions,such as the quintessence state parameter,angular momentum,and magnetic charge magnitude.The photon regions depend sensitively on the horizon structure and possess intricate features.Moreover,from the viewpoint of a static observer,we explore a few observables,especially those associated with the distortion of the observed black hole shadows.展开更多
基金Supported by Natural Science Foundation of China(11605152,11675139,51802247)。
文摘We study quasinormal modes(QNMs)of charged black holes in the Einstein-Maxwell-Weyl(EMW)gravity by adopting the test scalar field perturbation.We find that the imaginary part of QNM frequencies is consistently negative for different angular parameters l,indicating that these modes always decay and are therefore stable.We do not observe a linear relationship between the QNM frequencyωand parameter p for these black holes,as their charge Q causes a nonlinear effect.We evaluate the massive scalar field perturbation in charged black holes and find that random long lived modes(i.e.,quasiresonances)could exist in this spectrum.
基金Supported by the National Key R&D Program of China(2020YFC2201400)the Major Program of the National Natural Science Foundation of China(11690021)the National Natural Science Foundation of China(11505066)。
文摘In this work,we study the optical properties of a class of magnetically charged rotating black hole spacetimes.The black holes in question are assumed to be immersed in the quintessence field,and subsequently,the resulting black hole shadows are expected to be modified by the presence of dark energy.We investigate the photon region and the black hole shadow,especially their dependence on the relevant physical conditions,such as the quintessence state parameter,angular momentum,and magnetic charge magnitude.The photon regions depend sensitively on the horizon structure and possess intricate features.Moreover,from the viewpoint of a static observer,we explore a few observables,especially those associated with the distortion of the observed black hole shadows.
