Constraining the metric-affine bumblebee gravity parameter using black hole shadows and quasiperiodic oscillations of galactic microquasars
Year: 2025
Type: article
Abstract: We examine a static spherically symmetric black hole metric that originates from the vacuum solution of the traceless metric-affine bumblebee model in which spontaneous Lorentz symmetry-breaking occurs when the bumblebee fields acquire a non-vanishing vacuum expectation value. A free Lorentz-violating parameter enters into the basic formulation of the metric-affine bumblebee model. In this study, we use observations from the Event Horizon Telescope (EHT) collaboration on $$M87^*$$ M 87 ∗ and $$SgrA^*$$ S g r A ∗ to analyse the shadow of the black hole and an attempt has been made to constrain that free Lorentz-violating parameter. We also investigate particle motion over time-like geodesics and compute the corresponding epicyclic frequencies. We further constrain the Lorentz-violating parameter by using the reported high-frequency quasi-periodic oscillations (QPOs) of microquasars, offering new insights into its possible impact on astrophysical phenomena.
Source: The European Physical Journal C
Authors: Sohan Kumar Jha, Anisur Rahaman
Institutions: Chandernagore College, Durgapur Government College
Language: English
Subfield: Statistical and Nonlinear Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409649854