Accès ouvert
2026
preprint
OpenAlex
Yongqi Zhang, Hayden Scholz, Ken D. Olum, Lucas Steinberger et autres
Pulsar timing arrays search for stochastic processes such as gravitational waves by comparing pulse time of arrival data for millisecond pulsars to expectations from a background with a given power spectral density (PSD). To make the analysis computationally tractable, the Bayesian likelihood …
Accès ouvert
2026
preprint
OpenAlex
Nikita Agarwal, Gabriella Agazie, Alessandra Amosso, Akash Anumarlapudi et autres
We report updated nHz gravitational wave (GW) significance, characterization, and interpretations using the customized chromatic-noise models (CNMs) developed in Larsen, Baier et al. (2026). for the NANOGrav 15-year data set. We find increased evidence for the Hellings-Downs (HD) correlation signature of the …
Accès ouvert
2026
preprint
OpenAlex
Bjorn Larsen, Jeremy G. Baier, Daniel J Oliver, Kalista Wayt et autres
Pulsar timing arrays conduct low-frequency gravitational wave searches, which require comprehensive accounting of various noise sources to achieve robust results. Interstellar propagation effects (e.g., dispersion and scattering) are especially complex noise sources, introducing chromatic delays that can reduce sensitivity to gravitational waves …