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August 24, 2026International Journal of Geometric Methods in Modern Physics

QPOs, thermodynamics and geodesics of black-bounce black holes with global monopole and cloud of strings

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Authors

SJShokhzod JumaniyozovNew Uzbekistan UniversityJRJavlon RayimbaevCYChengxun Yuan

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Implication

Theoretical modeling demonstrates altered thermodynamics and reduced shadow sizes in regular black-bounce spacetimes, highlighting observable signatures for testing modified gravity.

Key Points

  • To determine how topological defects, specifically a global monopole and a cloud of cosmic strings, alter the horizon geometry, thermodynamic stability, shadow radius, and particle geodesics of a regular Simpson-Visser black hole.
  • Derived the modified spacetime metric via Einstein's field equations by coupling the Simpson-Visser regular black-bounce geometry with early-universe topological defects.
  • Calculated thermodynamic metrics (Hawking temperature, entropy, heat capacity, Gibbs free energy, enthalpy) and analyzed null and timelike geodesics for photon deflection, shadow formation, and the innermost stable circular orbit.
  • The global monopole and cloud of cosmic strings introduced angular deficits that reduced the effective mass and systematically altered thermodynamic stability and phase transitions relative to standard Schwarzschild black holes.
  • The regularization parameter and cosmic defects collectively shrank the photon sphere and black hole shadow radius, modifying the deflection of light and shifting the innermost stable circular orbits of massive particles.

Cite This Study

Jumaniyozov et al. (2026) studied this question.

synapsesocial.com/papers/6a8c009fbca056c88e6df635https://doi.org/10.1142/s0219887826503767
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