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195 papers · 1 filter
Matter Maps to Geometry in Gravitational Collapse
H. Khodabakhshi, Zhi-Chao Li, H. Lu +1
We establish an exact bidirectional map between the effective homogeneous interior density of a collapsing star and the exterior metric function in generalized Oppenheimer--Snyder…
Continuous Sensitivity Analysis for Formalism
S. Mohammad Ahmadi
The formalism provides a powerful non-perturbative framework for following the evolution of primordial curvature perturbations on super-horizon scales. However, its standard i…
formalism with gradient interactions
S. Mohammad Ahmadi, Nahid Ahmadi
The standard formalism is a cornerstone technique for calculating curvature perturbations on super-Hubble scales. However, its validity relies heavily on the separate universe…
Deviations from Gaussian White Noise in Stochastic Inflation
Zahra Ahmadi, Mahdiyar Noorbala
Stochastic inflation is widely used as a framework to study scalar field perturbations on an inflationary spacetime in a classical manner. In Starobinsky's seminal work and most of…
Observational Constraints on Chaplygin Gas Models in Non-Minimally Coupled Power Law Gravity with Quasars
Nakul Aggarwal, Ali Pourmand, Fatimah Shojai +1
In the framework of gravity, where gravity emerges from non-metricity , we explore the cosmological implications of its non-minimal coupling to matter. Inspired by the re…
Cosmological Black hole Candidates: A Detailed Analysis of McVittie, Culetu, Sultana-Dyer, and Glass-Mashhoon Spacetimes
M. Esfandiar, F. Shojai, O. Zamani Jamshidi +1
This paper investigates the existence of cosmological black holes by analyzing the properties of trapping horizons in detail, based on Hayward's formalism of future outer and past…