The Role of Exotic Particles in Modern Cosmology

Abstract

Modern cosmology seeks to understand the fundamental constituents and dynamics of the universe. Exotic particles—hypothetical entities beyond the Standard Model of particle physics—play a crucial role in advancing theories of dark matter, dark energy, baryogenesis, and the early universe. These particles, including axions, sterile neutrinos, WIMPs, and magnetic monopoles, are not only central to theoretical models but also serve as targets for experimental and observational searches. This paper explores the theoretical motivations, cosmological roles, detection strategies, and challenges associated with exotic particles, drawing connections between particle physics, astrophysics, and cosmology.