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Shadow of slowly rotating Kalb-Ramond black holes

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arxiv 2407.07416 v2 pith:Y2C22FVJ submitted 2024-07-10 gr-qc hep-th

Wentao Liu , Di Wu , Jieci Wang This is my paper · ORCID
classification gr-qchep-th
keywords blackholesrotatingshadowlorentz-violatingsolutionseffectsfields
verification ladder T0 review T1 audit T2 compute T3 formal

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Real astronomical objects possess spin, yet deriving exact solutions for rotating black holes within gravitational theories is a formidable challenge. To understand the shadow of rotating black holes in Lorentz-violating spacetimes induced by antisymmetric tensor fields, known as Kalb-Ramond (KR) fields, we have focused on the slow-rotation approximation framework. Using this approach, we have obtained first-order rotation series solutions, which describe slowly rotating KR black holes. For this solutions, we have plotted the black hole shadow contours under various parameters using the numerical backward ray-tracing method. As the Lorentz-violating parameter increases, not only the apparent size of the black hole shadow decreases, but also the effects of rotation, such as the D-shaped structure and frame-dragging, are amplified. Furthermore, the KR field also enhances gravitational lensing, causing the shadow to occupy a larger area within the photon ring. This distinctive feature can differentiate KR gravity from general relativity. Additionally, using the latest observational data from EHT on M87* and Sgr A*, we have provided constraints on the Lorentz-violating parameter of rotating KR black holes. We found that, compared to static black holes, rotating black holes allow for the presence of stronger Lorentz violation effects.

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Cited by 11 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Signatures of Lorentz violation in bright ring for Sgr A* images by radiation ineffective accretion flows

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    For a rotating Lorentz-violating black hole, increasing the LV parameter shrinks and broadens Sgr A*'s image ring, and EHT data bound the parameter over a spin-dependent range.

  2. Evaporating cosmologically coupled black holes

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    If a black hole's mass grows with cosmic expansion, Hawking evaporation is slowed or reversed, weakening gamma-ray bounds on primordial black holes.

  3. A Universal Framework for Horizon-Scale Tests of Gravity with Black Hole Shadows

    gr-qc 2025-11 conditional novelty 6.0 of 10

    An adaptive ray-tracing and MCMC framework estimates shadow observables for arbitrary stationary metrics; applied to the Kerr–Bertotti–Robinson spacetime it yields an Sgr A* horizon-scale magnetic field of about 93 G ...

  4. Schwarzschild Black Holes Immersed in Born-Infeld Magnetic Fields and Their Observational Signatures

    gr-qc 2025-06 conditional novelty 6.0 of 10

    Numerically solving full Born-Infeld magnetic fields around a Schwarzschild black hole makes meridional photon orbits prolate and elongates the black hole shadow along the polar axis at high inclination.

  5. Lorentz-violating modifications to particle dynamics, thermodynamics and vacuum energy in bumblebee gravity

    gr-qc 2026-01 reject novelty 5.0 of 10

    Bumblebee-gravity corrections to black-hole dynamics, thermodynamics, and Casimir energy are derived, but the central dispersion relation is sign-inconsistent and the thermodynamic integrals carry a spurious factor.

  6. Exact Black Hole Solutions in Bumblebee Gravity with Lightlike or Spacelike VEVS

    gr-qc 2025-10 conditional novelty 5.0 of 10

    New exact Schwarzschild-like, (A)dS-like, and charged black holes in bumblebee gravity with a two-component vector VEV keep Lorentz-violating corrections even when the VEV is lightlike, with Wald and first-law entropi...

  7. Spherical photon orbits around the Kerr-like black hole in Einstein-Bumblebee gravity

    gr-qc 2025-07 conditional novelty 5.0 of 10

    In Einstein-Bumblebee Kerr-like spacetimes, spherical photon orbits are governed by a sixth-order polynomial whose roots and critical inclination angle depend on the Lorentz-violation parameter.

  8. Charged black holes in Kalb-Ramond gravity: Weak Deflection Angle, Shadow cast, Quasinormal Modes and Neutrino annihilation

    gr-qc 2025-05 reject novelty 4.0 of 10

    The Kalb-Ramond black hole phenomenology is mostly an extension of known results, and its shadow formula is internally inconsistent, invalidating the EHT-based constraints.

  9. Influence of a Kalb-Ramond black hole on neutrino behavior

    gr-qc 2025-04 conditional novelty 4.0 of 10

    In a Kalb-Ramond modified black hole spacetime, neutrino-antineutrino energy deposition and flavor oscillation probabilities are suppressed and reshaped by the Lorentz-violating parameter ℓ.

  10. Quasinormal Modes and Dynamical Evolution of Scalar Fields in the Einstein-Bumblebee Theory with a Cosmological Constant

    gr-qc 2025-02 conditional novelty 4.0 of 10

    For scalar perturbations of Einstein-Bumblebee black holes in de Sitter spacetime, increasing the Lorentz-violation parameter or the cosmological constant generally lowers the quasinormal mode frequency and damping rate.

  11. Shadows and accretion disk images of charged rotating black hole in modified gravity theory

    gr-qc 2024-11 conditional novelty 4.0 of 10

    Ray-traced images of the Kerr-Newman-MOG black hole show that the MOG parameter α enlarges and rounds the shadow, and its effect beats that of the electric charge Q.

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