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Primordial Black-Hole-Based Pathways to Little Red Dots
Valerio De Luca, Loris Del Grosso, Gabriele Franciolini +4
The James Webb Space Telescope has uncovered a population of compact, high-redshift sources, the Little Red Dots (LRDs), which may host supermassive black holes (BHs) significantly…
Measuring the Hubble Constant with Double Gravitational Wave Sources in Pulsar Timing
Casey McGrath, Daniel J. D'Orazio, Jolien Creighton
Pulsar timing arrays (PTAs) are searching for gravitational waves from supermassive black hole binaries (SMBHBs). Here we show how future PTAs could use a detection of gravitationa…
Using Gravitational Wave Parallax to Measure the Hubble Parameter with Pulsar Timing Arrays
Daniel J. D'Orazio, Abraham Loeb
We demonstrate how pulsar timing arrays (PTAs) can, in principle, yield a purely gravitational wave (GW) measurement of the luminosity distance and comoving distance to a supermass…