8 papers
Spinning test particles in the spacetime of a global monopole
Morteza Mohseni, Saurya Das
We investigate the motion of spinning test particles in the spacetime of a global monopole in the framework of the Mathisson-Papapetrou-Dixon equations. By making use of the symmet…
Quantum resolution of the Schwarzschild singularity
Vishnulal Cheriyodathillathu, Tanmay Patil, Saurya Das +1
We revisit the Schwarzschild singularity in a semiclassical setting where the background geometry is classical and quantum effects enter through Bohmian (quantal) trajectories asso…
Closing the Cosmographic Hierarchy: Dynamical Attractors from Inflation to Reheating
Seturumane Tema, S. Shajidul Haque, Saurya Das +1
We develop a potential-independent cosmographic framework, in which cosmographic parameters are promoted to dynamical variables within a closed autonomous system. Although the cosm…
Arrival Time -- Classical Parameter or Quantum Operator?
MohammadJavad Kazemi, MohammadHossein Barati, Ghadir Jafari +2
The question of how to interpret and compute arrival-time distributions in quantum mechanics remains unsettled, reflecting the longstanding tension between treating time as a quant…
Power-Law Bounces in Gravity: Analysis of the Ekpyrosis and Accelerating Regimes
Saurya Das, Peter Dunsby, S. Shajidul Haque +1
We investigate the dynamics of the Friedmann-Lemaître-Robertson-Walker spacetime within the framework of gravity using a compact, model-independent dynamical systems approa…
Cosmological Singularity and Power-Law Solutions in Modified Gravity
Saurya Das, S. Shajidul Haque, Seturumane Tema
A bouncing Universe avoids the big-bang singularity. Using the time-like and null Raychaudhhuri equations, we explore whether the bounce near the big-bang, within a broad spectrum…