72 citations · 88 across the 3 of their papers we have counts for
11 papers
The Cosmological Spinor
Jibril Ben Achour, Etera R. Livine
We build upon previous investigation of the one-dimensional conformal symmetry of the Friedman-Lema\^ itre-Robertson-Walker (FLRW) cosmology of a free scalar field and make it expl…
Towards consistent black-to-white hole bounces from matter collapse
Jibril Ben Achour, Suddhasattwa Brahma, Shinji Mukohyama +1
This article presents a new model-independent constraint for bouncing black hole geometries. Using the thin shell formalism, this constraint sets a bound on the minimal allowed rad…
Bouncing compact objects. Part II: Effective theory of a pulsating Planck star
Jibril Ben Achour, Jean-Philippe Uzan
This article presents an effective quantum extension of the seminal Oppenheimer-Snyder (OS) collapse in which the singularity resolution is modeled using the effective dynamics of…
Bouncing compact objects I: Quantum extension of the Oppenheimer-Snyder collapse
Jibril Ben Achour, Suddhasattwa Brahma, Jean-Philippe Uzan
This article proposes a generalization of the Oppenheimer-Snyder model which describes a bouncing compact object. The corrections responsible for the bounce are parameterized in a…
Hairy black holes in DHOST theories: Exploring disformal transformation as a solution-generating method
Jibril Ben Achour, Hongguang Liu, Shinji Mukohyama
Solutions-generating methods based on field redefinitions, such as conformal mapping, play an important role in investigating exact solutions in modified gravity. In this work, we…
Protected Symmetry in Quantum Cosmology
Jibril Ben Achour, Etera R. Livine
The polymer quantization of cosmological backgrounds provides an alternative path to the original Wheeler-de Witt (WdW) quantum cosmology, based on a different representation the c…