385 citations · 3.2k across the 77 of their papers we have counts for
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The diffraction-lensing interpretation of GW231123 with astrophysical priors
Mark Ho-Yeuk Cheung, Digvijay Wadekar, Matias Zaldarriaga +3
GW231123, if unlensed, is a rare binary black hole merger with high masses and high spins for both progenitors. We show that the signal is better fitted by a lower-mass, lower-spin…
Primordial magnetic fields and modified recombination histories
Jonathan Schiff, Tejaswi Venumadhav
Recent cosmological data and astrophysical observations, such as the Hubble tension and the increasing preference from galaxy surveys for dynamical dark energy, have begun to chall…
Probing the nature of dark matter using strongly lensed gravitational waves from binary black holes
Souvik Jana, Shasvath J. Kapadia, Tejaswi Venumadhav +2
Next-generation ground-based gravitational-wave (GW) detectors are expected to detect millions of binary black hole mergers during their operation period. A small fraction ($\sim 0…
Cosmography using strongly lensed gravitational waves from binary black holes
Souvik Jana, Shasvath J. Kapadia, Tejaswi Venumadhav +1
Third generation gravitational wave (GW) detectors are expected to detect millions of binary black hole (BBH) mergers during their operation period. A small fraction of them ($\sim…
Fundamental Physics with the Square Kilometre Array
A. Weltman, P. Bull, S. Camera +50
The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over a wide range of frequencies, and with an order of magnitude greater sensitivity an…
Implication of the Shape of the EDGES Signal for the 21 cm Power Spectrum
Alexander A. Kaurov, Tejaswi Venumadhav, Liang Dai +1
We revisit the 21 cm power spectrum from the epoch of cosmic dawn in light of the recent EDGES detection of the 21 cm global signal at frequencies corresponding to . The s…
Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn
Tejaswi Venumadhav, Liang Dai, Alexander Kaurov +1
The intergalactic medium is expected to be at its coldest point before the formation of the first stars in the universe. Motivated by recent results from the EDGES experiment, we r…
Probing Dark Matter Subhalos in Galaxy Clusters Using Highly Magnified Stars
Liang Dai, Tejaswi Venumadhav, Alexander A. Kaurov +1
Luminous stars in background galaxies straddling the lensing caustic of a foreground galaxy cluster can be individually detected due to extreme magnification factors of …
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…
Effect of lensing magnification on the apparent distribution of black hole mergers
Liang Dai, Tejaswi Venumadhav, Kris Sigurdson
The recent detection of gravitational waves indicates that stellar-mass black hole binaries are likely to be a key population of sources for forthcoming observations. With future u…
A new probe of magnetic fields in the pre-reionization epoch: II. Detectability
Vera Gluscevic, Tejaswi Venumadhav, Xiao Fang +3
In the first paper of this series, we proposed a novel method to probe large-scale intergalactic magnetic fields during the cosmic Dark Ages, using 21-cm tomography. This method re…
Sterile neutrino dark matter: A tale of weak interactions in the strong coupling epoch
Tejaswi Venumadhav, Francis-Yan Cyr-Racine, Kevork N. Abazajian +1
We perform a detailed study of the weak interactions of standard model neutrinos with the primordial plasma and their effect on the resonant production of sterile neutrino dark mat…
Cosmology with the SPHEREX All-Sky Spectral Survey
Olivier Doré, Jamie Bock, Matthew Ashby +30
SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer) ( http://spherex.caltech.edu ) is a proposed all-sky spectroscopic survey sat…
New probe of magnetic fields in the prereionization epoch. I. Formalism
Tejaswi Venumadhav, Antonija Oklopcic, Vera Gluscevic +2
We propose a method of measuring extremely weak magnetic fields in the intergalactic medium prior to and during the epoch of cosmic reionization. The method utilizes the Larmor pre…
Stability of small-scale baryon perturbations during cosmological recombination
Tejaswi Venumadhav, Christopher Hirata
In this paper, we study small-scale fluctuations (baryon pressure sound waves) in the baryon fluid during recombination. In particular, we look at their evolution in the presence o…