A5101936210- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
Indian Institute of Astrophysics
2022-2025
Abstract We propose a novel mechanism where primordial black hole (PBH) dark matter is formed much later in the history of universe, between epochs Big Bang nucleosynthesis and cosmic microwave background photon decoupling. In our setup, one does not need to modify scale-invariant inflationary power spectra; instead, late-phase transition strongly interacting fermion–scalar fluid (which occurs naturally around redshift 10 6 ≤ z T 8 ) creates an instability density perturbation as sound speed...
Many previous studies have explored models of dynamically interacting dark energy scenarios instead a cosmological constant and cold matter. This work aims to offer comprehensive investigation the Yukawa-type interaction between matter where mass is also function dynamical scalar field value. Unlike work, taking an approximate solution, we numerically solve Klein-Gordon equation that governs intricate interplay these two components sector along with corresponding perturbations, using...