Tina Kahniashvili^1,2,3,*, Arjun Kar^1,†, George Lavrelashvili^4,5,‡, Nishant Agarwal^6,7,§, Lavinia Heisenberg^8,9,∥, and Arthur Kosowsky^10,11,¶

• ¹The McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, USA
• ²Department of Physics, Laurentian University, Ramsey Lake Road, Sudbury, Ontario P3E 2C, Canada
• ³Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Avenue, Tbilisi, GE-0194, Georgia
• ⁴Department of Theoretical Physics, A. Razmadze Mathematical Institute, I. Javakhishvili Tbilisi State University, GE-0177 Tbilisi, Georgia
• ⁵Max-Planck-Institute for Gravitational Physics, Albert-Einstein-Institute, D-14476 Potsdam, Germany
• ⁶Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
• ⁷Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
• ⁸Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, 10691 Stockholm, Sweden
• ⁹Department of Physics & The Oskar Klein Centre, AlbaNova University Centre, 10691 Stockholm, Sweden
• ¹⁰Department of Physics and Astronomy, University of Pittsburgh, 3941 O’Hara Street, Pittsburgh, Pennsylvania 15260 USA
• ¹¹Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC), Pittsburgh, Pennsylvania 15260 USA

• ^*tinatin@andrew.cmu.edu
• ^†arjunkar@andrew.cmu.edu
• ^‡lavrela@itp.unibe.ch
• ^§nua11@psu.edu
• ^∥laviniah@kth.se
• ^¶kosowsky@pitt.edu