New approach to template banks of gravitational waves with higher harmonics: Reducing matched-filtering cost by over an order of magnitude

2 code implementations • 23 Oct 2023 • Digvijay Wadekar, Tejaswi Venumadhav, Ajit Kumar Mehta, Javier Roulet, Seth Olsen, Jonathan Mushkin, Barak Zackay, Matias Zaldarriaga

To model aligned-spin $(3, 3)$, $(4, 4)$ waveforms corresponding to a given $(2, 2)$ waveform, we use a combination of post-Newtonian formulae and machine learning tools.

New Binary Black Hole Mergers in the Second Observing Run of Advanced LIGO and Advanced Virgo

1 code implementation • 15 Apr 2019 • Tejaswi Venumadhav, Barak Zackay, Javier Roulet, Liang Dai, Matias Zaldarriaga

The most secure new event, GW170121 ($p_{\rm astro} > 0. 99$), is also notable due to its inferred negative value of $\chi_{\rm eff}$, which is inconsistent with being positive at the $\approx 95. 8\%$ confidence level.

High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics General Relativity and Quantum Cosmology

A Highly Spinning and Aligned Binary Black Hole Merger in the Advanced LIGO First Observing Run

1 code implementation • 27 Feb 2019 • Barak Zackay, Tejaswi Venumadhav, Liang Dai, Javier Roulet, Matias Zaldarriaga

We report a new binary black hole merger in the publicly available LIGO First Observing Run (O1) data release.

High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics General Relativity and Quantum Cosmology

Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn

1 code implementation • 6 Apr 2018 • Tejaswi Venumadhav, Liang Dai, Alexander Kaurov, Matias Zaldarriaga

We also find that the effect is more dramatic in non-standard scenarios that either enhance the radio background above the CMB or invoke new physics to cool the gas in order to explain the EDGES results.

Cosmology and Nongalactic Astrophysics