47 citations · 222 across the 29 of their papers we have counts for
29 papers
Complex Geodesics in the Nariai Geometry
Lars Aalsma, Mir Mehedi Faruk
We study two-point correlation functions of heavy scalar fields in the Nariai geometry. Utilizing the heat kernel formalism, we obtain this result from a geodesic approximation to…
Time Dependent String Compactification: Towards Bouncing Cosmology
Mir Mehedi Faruk
We study the Null Energy Condition (NEC) arising from the Virasoro constraint on the string worldsheet. We then analyze how the NEC in the external spacetime directions emerges und…
Quasinormal Modes and the Switchback Effect in Schwarzschild-de Sitter
Mir Mehedi Faruk, Facundo Rost, Jan Pieter van der Schaar
We study the causal structure of Schwarzschild-de Sitter (SdS), including shock wave perturbations, in using reflected null ray trajectories, either through the interior blac…
Deriving the Gibbons-Maldacena-Nunez no-go theorem from the Raychaudhuri equation
Mir Mehedi Faruk
In this article, we point out that to solve the null Raychaudhuri equation for higher dimensional spacetime with accelerating FRW solution in external directions and static compact…
Static sphere observers and geodesics in Schwarzschild-de Sitter spacetime
Mir Mehedi Faruk, Edward Morvan, Jan Pieter van der Schaar
We analyze null- and spacelike radial geodesics in Schwarzschild-de Sitter spacetime connecting two conjugate static sphere observers, i.e. free-falling observers at a fixed radius…
Accelerated paths and Unruh effect II: finite time detector response in (Anti) de Sitter spacetime and Huygen's Principle
Shahnewaz Ahmed, Mir Mehedi Faruk, Muktadir Rahman
We study the finite time response of an Unruh-DeWitt particle detector described by a qubit (two-level system) moving with uniform constant acceleration in maximally symmetric spac…