2019/02/25 by Aditya Vidhate, Vidhate, Aditya, Rahul Nigam +1
Physics and Astronomy · #Astro and Planetary Science #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Planetary Science and Exploration #Space Science and Extraterrestrial Life #astro-ph.CO
paper · pdf · doi:10.48550/arxiv.1902.09125
arxiv created 2019/02/25 · openalex publication_date 2019/02/25 · arxiv updated 2019/02/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We explore the real solutions to the Spherical Collapse Model in a non-flat Universe with a Cosmological Constant, and observe a possible situation for a fake or Ghost Collapse, in which an expanding overdense spherical region, turns around and begins to collapse, turns around again after a finite time and starts expanding. To make such a situation of spurious collapse feasible, we make a linear redshift dependent correction to the standard Dark Energy density term which is originally in the form of a cosmological constant. There is good reason to believe in such a correction based on recent research which hints that Dark Energy desnity evolves with the redshift (even becomes negative) when fit to observational data.