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Detecting primordial gravitational waves with circular polarization of the redshifted 21 cm line: I. Formalism
Christopher M. Hirata, Abhilash Mishra, Tejaswi Venumadhav
We propose a new method to measure the tensor-to-scalar ratio using the circular polarization of the 21 cm radiation from the pre-reionization epoch. Our method relies on the s…
Microlensing of Extremely Magnified Stars near Caustics of Galaxy Clusters
Tejaswi Venumadhav, Liang Dai, Jordi Miralda-Escudé
Recent observations of lensed galaxies at cosmological distances have detected individual stars that are extremely magnified when crossing the caustics of lensing clusters. In idea…
On the waveforms of gravitationally lensed gravitational waves
Liang Dai, Tejaswi Venumadhav
Strong lensing by intervening galaxies can produce multiple images of gravitational waves from sources at cosmological distances. These images acquire additional phase-shifts as th…