https://doi.org/10.1140/epjc/s10052-025-14110-3
Regular Article - Theoretical Physics
Constraining the metric-affine bumblebee gravity parameter using black hole shadows and quasiperiodic oscillations of galactic microquasars
1
Chandernagore College, Chandernagore, Hooghly, West Bengal, India
2
Department of Physics, Durgapur Government College, Durgapur, 713214, Burdwan, West Bengal, India
a manisurn@gmail.com, anisur@associates.iucaa.in
Received:
21
December
2024
Accepted:
23
March
2025
Published online:
21
April
2025
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 
and 
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.
© The Author(s) 2025
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