Department of Physics & Astronomy, National Institute of Technology, Rourkela, Odisha 769008
Prof. Biswarup Mukhopadhyaya
Professor I, Physics, Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad 211019
The present work presents a very brief case study on Dark Matter which is proposed to account for approximately 24% of the energy density in the Universe. A lot of advancements has been made in regard to the existence, nature, and the detection of dark matter since the notion was first propsed by Franck Zwicky in the early 1930s. The current work summarises the most conclusive evidences in favour of the existence of dark matter, its nature - baryonic or non-baryonic, and some detection methods (both direct and indirect) developed over the past few decades. The focal point of this work is to elucidate the need for dark matter hypothesis by studying the several evidences from varying sources ranging from galactic observations to the ubiquitous Cosmic Microwave Background Radiation (CMBR), and give a brief qualitative account of the dark matter particle candidates, including the theoretical motivations and experimental evidences leading to a discussion on the various detection methods, involving both direct and indirect detection techniques, suitable for a non-expert of the field.
Keywords: cosmology, dark matter, cosmic microvae background radiation (CMBR), density parameter, baryonic and non-baryonic candidates