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Quasiperiodic oscillations, weak field lensing and shadow cast around black holes in symmergent gravity. (English) Zbl 1523.83044

Summary: In this work, we performed a systematic study of the Symmergent gravity (SG) in a black hole (BH) environment. Being an emergent gravity model in which gravity emerges to restore the gauge symmetries and stabilize the Higgs boson mass in a way giving a holographic ultraviolet (UV) completion of the underlying quantum field theory, the SG involves the general relativity (GR) plus quadratic-curvature term with a loop-induced coupling \(c_0\) being proportional to the boson-fermion number difference. We investigated \(c_0\) and other quantities by utilizing the various BHs observations. In this regard, we investigated particle dynamics, obtained Keplerian frequencies describing the harmonic oscillations, and determined quasi periodic oscillations (QPOs) about such orbits by using the relativistic precession (RP), warped disk (WD), and epicyclic resonant (ER) models. We also analyse the BH shadow and determine constraints on the loop parameter \(c_0\) from the Event Horizon Telescope (EHT) data for both the static observers and observers co-moving with the cosmological expansion. We explored the weak deflection angle by considering the effect of finite distance and studied the resulting Einstein rings. We conclude the work by giving an overall discussion of the quasiperiodic oscillations, shadow cast, and weak deflection angle, with a mention of future prospects concerning other possible investigations of the SG. We also study weak deflection angle and planetary perihelion shift and determined bounds on the SG parameters. Furthermore, we compute shadow radius for both static and co-moving observers near and far from the Symmergent BH and revealed the sensitivity of these observers to the model parameters. We conclude the work by giving an overall discussion and giving future prospects concerning other possible analyses of the SG.

MSC:

83C57 Black holes
83E05 Geometrodynamics and the holographic principle
81V22 Unified quantum theories
35B05 Oscillation, zeros of solutions, mean value theorems, etc. in context of PDEs
78A45 Diffraction, scattering
37C50 Approximate trajectories (pseudotrajectories, shadowing, etc.) in smooth dynamics
54D35 Extensions of spaces (compactifications, supercompactifications, completions, etc.)
81V80 Quantum optics
81V72 Particle exchange symmetries in quantum theory (general)
85A15 Galactic and stellar structure
70M20 Orbital mechanics

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