15 citations · 35 across the 10 of their papers we have counts for
10 papers
Geometric effects of torsion on black hole ringdown and shadows in Poincaré gauge gravity
Terkaa Victor Targema, Kazuharu Bamba, Riasat Ali +1
Spacetime torsion provides a natural extension of general relativity and may lead to black hole solutions that differ significantly from their Einsteinian counterparts. We investig…
Thermodynamics and optical aspects of ModMax black holes in higher order curvature gravity with quintessence dark energy
Ahmad Al-Badawi, Usman Zafar, Abdul Jawad +1
In this work, we derive an exact black hole solution in higher-order curvature gravity by coupling an electromagnetic sector formulated within the ModMax framework to a quintessenc…
On the Maldacena-Shenker-Stanford chaos bound in black hole spacetimes: Saturation, apparent violations, and their geometric origin
Terkaa Victor Targema, Kazuharu Bamba, Usman Zafar
Reported violations of the Maldacena-Shenker-Stanford (MSS) chaos bound in black hole spacetimes raise the question of whether they reflect a genuine breakdown, a feature of partic…
Generalized First Law and Smarr-type Relation: Beyond Additivity and Extensivity
Usman Zafar, Krishnakanta Bhattacharya, Kazuharu Bamba
In this work, we develop a general framework for deriving the first law of black hole thermodynamics and the associated Smarr-type relation for 4-dimensional static spherically sym…
Thermodynamic Topology and Photon Spheres Analysis of Black Holes in Brane-World: Insights from Barrow Entropy
Usman Zafar, Abdul Jawad, Kazuharu Bamba +4
We explore the thermodynamics and geothermodynamics of black holes with Barrow entropy in a brane-world scenario, where the horizon geometry of the black hole is regarded as a frac…
Physical constraints on the Maldacena-Shenker-Stanford chaos-bound in black hole spacetimes
Terkaa Victor Targema, Kazuharu Bamba, Riasat Ali +1
Chaotic motion near black holes has recently been examined through the lens of the Maldacena-Shenker-Stanford (MSS) chaos-bound, but reported violations remain contradictory. A sig…
An innovative black hole solution and thermodynamic properties in higher-order curvature gravity with a scalar field
G. G. L. Nashed, Usman Zafar, Kazuharu Bamba
A spherically symmetric black hole solution defined by the gravitational mass is explored in higher-order curvature gravity associated with a scalar field. It is demonstrated that…
Thermodynamic and observational implications of black holes in toroidal geometry
Usman Zafar, Kazuharu Bamba, Abdul Jawad +2
We investigate the thermodynamic and observational implications for the charged torus-like black holes, a class of solutions distinct from the classical Schwarzschild black holes.…
Exploring the Effects of Generalized Entropy onto Bardeen Black Hole Surrounded by Cloud of Strings
Hamza Tariq, Usman Zafar, Shahid Chaudhary +3
This work explores the thermodynamic characteristics and geothermodynamics of a Bardeen black hole (BH) that interacts with a string cloud and is minimally connected to nonlinear e…
Thermodynamic analysis of black holes with cloud of strings and quintessence via Barrow entropy
Usman Zafar, Kazuharu Bamba, Tabinda Rasheed +1
We explore a Reissner-Nordström Anti-de Sitter (RN-AdS) black hole with a cloud of string and quintessence to study thermodynamics and thermodynamic topology in the presence of Bar…