Probing our Universe's Past Using Earth's Geological and Climatological History and Shadows of Galactic Black Holes

Understand

In this short review, we discuss how Earth's climatological and geological history and also how the shadows of galactic black holes might reveal our Universe's past evolution.

• Specifically we point out that a pressure singularity that occurred in our Universe's past might have left its imprint on Earth's geological and climatological history and on the shadows of cosmological black holes.
• Our approach is based on the fact that the $H_0$ tension problem may be resolved if some sort of abrupt physics change occurred in our Universe $70-150\,$Myrs ago, an abrupt change that deeply affected the Cepheid parameters.
• We review how such an abrupt physics change might have been caused in our Universe by a smooth passage of it through a pressure finite-time singularity.