| Abstract: IndIGO-D collaboration*
Since the landmark discovery in 2015, gravitational-wave observations have revolutionized our understanding of the cosmos. With the advent of next-generation ground-based gravitational-wave observatories such as Cosmic Explorer and the Einstein Telescope, the emerging evidence for nanohertz gravitational waves from pulsar timing arrays, and the planned Laser Interferometer Space Antenna (LISA) operating in the millihertz band, gravitational waves are poised to play an increasingly central role in astronomy and fundamental physics over the coming decade. Here, we discuss a potential space-based gravitational-wave mission operating in the Decihertz band, between 0.1–30 Hz. The concept consists of an L-shaped interferometer with an arm length of approximately 1,000 km. We tentatively refer to this mission as the Indian Initiative in Gravitational-wave Observations in the Decihertz band (IndIGO-D). We outline possible orbital configurations and projected sensitivities, and examine the unique astrophysical science enabled by observations in this frequency range. In particular, we highlight how decihertz gravitational-wave measurements can address several outstanding problems in astronomy and fundamental physics.
*Anand Sengupta, Anupreeta More, Apratim Ganguly, Archana Pai, Arunava Mukherjee, Banibrata Mukhopadhyay, Chandra Kant Mishra, Debarati Chatterjee, Dishari Malakar, Emanuel Hoque, Haris K, Kanika tKakran, Mayusree Das, Prakhar Dave, Prashanth Upadhya, Prayush Kumar, Rahul Kashyap, Rajesh Maiti, Sajal Mukherjee, Sanjit Mitra, Saurabh Kumar, Sendhil Raja S, Shasvath Kapadia, Shilpa Kastha, Soumen Basak, Souradeep Pal, Sreekumar P, Subhamoy Chakraborty, Sumanta Chakraborty, Suresh Doravari, Susmita Dash, Suvodip Mukherjee, Vincent A, Rashmi Meena, Ali Murtaza, Nikita Yadav, Sayantan Pal, Divya Tahelyani, Abhishek Sharma, Ajith Kumar Mehta, Karamveer Kaur
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