Photonsphere, shadow, quasinormal modes, and greybody bounds of non-rotating Simpson–Visser black hole

• Published in: European physical journal plus 2023-08, Vol.138 (8), p.757, Article 757
• Main Author: Jha, Sohan Kumar
• Format: Article
• Language: English
• Subjects: Accretion disks; Angular momentum; Applied and Technical Physics; Atomic; Black holes; Complex Systems; Condensed Matter Physics; Gravitational waves; Mathematical and Computational Physics; Molecular; Optical and Plasma Physics; Parameters; Physics; Physics and Astronomy; Radiation; Regular Article; Rotation; Shadows; Spacetime; Temperature dependence; Theoretical
• ISSN: 2190-5444; 2190-5444
• DOI: 10.1140/epjp/s13360-023-04384-5

In this manuscript, we study photonsphere, shadow, quasinormal modes, Hawking temperature, and greybody bounds of a non-rotating Simpson–Visser black hole which is a regular black hole. We observe that though the radius of the photonsphere does depend on the Simpson–Visser parameter α , the shadow radius is independent of it. The shadow radius is found to be equal to that for Schwarzschild black hole. We, then, study quasinormal frequencies of the Simpson–Visser black hole for scalar and electromagnetic perturbations with the help of 6th-order WKB method. We tabulate values of quasinormal frequencies for various values of α , angular momentum ℓ , and overtone number n . We also graphically show the dependence of real and imaginary parts of quasinormal frequency on α and ℓ . Additionally, We study the convergence of the WKB method for various values of pair ( n , ℓ ) . Finally, we shed light on the dependence of the Hawking temperature on the parameter α and the dependence of greybody bounds on α and ℓ .