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15 papers · 2 filters
Shadow cast and deflection of light by charged rotating regular black holes
Rahul Kumar, Sushant G. Ghosh, Anzhong Wang
We discuss the horizon properties, shadow cast, and the weak gravitational lensing of charged rotating regular black holes, which in addition to mass () and rotation parameter (…
Primordial power spectrum from the dressed metric approach in loop cosmologies
Bao-Fei Li, Parampreet Singh, Anzhong Wang
We investigate the consequences of different regularizations and ambiguities in loop cosmological models on the predictions in the scalar and tensor primordial spectrum of the cosm…
Revisiting pre-inflationary universe of family of attractor in loop quantum cosmology
M. Shahalam, Mudhahir Al Ajmi, R. Myrzakulov +1
In this work, we revisit the dynamics of pre-inflationary universe with a family of attractor potentials, in the framework of loop quantum cosmology, in which the big bang sing…
Rotating regular black holes in conformal massive gravity
Kimet Jusufi, Mubasher Jamil, Hrishikesh Chakrabarty +3
In this paper, we use a suitable conformal rescaling to construct static and rotating regular black holes in conformal massive gravity. The new metric is characterized by the mass…
"Massive" Rarita-Schwinger field in de Sitter space
Hamed Pejhan, Mohammad Enayati, Jean-Pierre Gazeau +1
We present a covariant quantization of the "massive" spin- Rarita-Schwinger field in de Sitter (dS) spacetime. The dS group representation theory and its Wigner inte…
Model-independent test of the parity symmetry of gravity with gravitational waves
Wen Zhao, Tan Liu, Linqing Wen +4
Gravitational wave (GW) data can be used to test the parity symmetry of gravity by investigating the difference between left-hand and right-hand circular polarization modes. In thi…
Waveform of gravitational waves in the general parity-violating gravities
Wen Zhao, Tao Zhu, Jin Qiao +1
As an extension of our previous work [J.Qiao, T.Zhu, W.Zhao & A.Wang, arXiv:1909.03815], in this article, we calculate the effects of parity violation on gravitational-wave (GW) wa…
Waveform of gravitational waves in the ghost-free parity-violating gravities
Jin Qiao, Tao Zhu, Wen Zhao +1
Gravitational waves (GWs) provide an excellent opportunity to test the gravity in the strong gravitational fields. In this article, we calculate the waveform of GWs, produced by th…
Inflationary perturbation spectra at next-to-leading slow-roll order in effective field theory of inflation
Guang-Hua Ding, Jin Qiao, Qiang Wu +2
The effective field theory (EFT) of inflation provides an essential picture to explore the effects of the unknown high energy physics in the single scalar field inflation models. F…
Gupta-Bleuler quantization for linearized gravity in de Sitter spacetime
Hamed Pejhan, Mohammad Enayati, Jean-Pierre Gazeau +1
In a recent Letter, we have pointed out that the linearized Einstein gravity in de Sitter (dS) spacetime besides the spacetime symmetries generated by the Killing vectors and the e…
Shadows and deflection angle of charged and slowly rotating black holes in Einstein-Æther theory
Tao Zhu, Qiang Wu, Mubasher Jamil +1
In this paper, we study the shadow cast by two types of charged and slowly rotating black holes in Eisntein-aether theory of gravity. This two types of black holes are correspondin…
Genericness of pre-inflationary dynamics and probability of the desired slow-roll inflation in modified loop quantum cosmologies
Bao-Fei Li, Parampreet Singh, Anzhong Wang
We study the evolution of spatially flat Friedmann-Lemaître-Robertson-Walker universe for chaotic and Starobinsky potentials in the framework of modified loop quantum cosmologies.…
Background dynamics of pre-inflationary scenario in Brans-Dicke loop quantum cosmology
Manabendra Sharma, Tao Zhu, Anzhong Wang
Recently the background independent nonperturbative quantization technique has been extended to theories of gravity and the corresponding quantum effective cosmology has been deriv…
Constraints of general screened modified gravities from comprehensive analysis of binary pulsars
Xing Zhang, Wen Zhao, Tan Liu +6
Testing gravity by binary pulsars nowadays becomes a key issue. Screened modified gravity is a kind of scalar-tensor theory with screening mechanism in order to satisfy the tight S…
Cylindrical Systems in General Relativity
K. Bronnikov, N. O. Santos, Anzhong Wang
With the arrival of the era of gravitational wave astronomy, the strong gravitational field regime will be explored soon in various aspects. In this article, we provide a general r…