Constraining gravitational wave propagation using pulsar timing array correlations
| Autor: | Bernardo, Reginald Christian, Ng, Kin-Wang |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 107, L101502 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.107.L101502 |
| Popis: | Pulsar timing arrays (PTA) are a promising probe to the cosmologically novel nanohertz gravitational wave (GW) regime through the stochastic GW background. In this work, we consider subluminal GW modes as a possible source of correlations in a PTA, utilizing the public code PTAfast and the 12.5 years correlations data by NANOGrav, which we hypothesize are sourced by GWs. Our results show no evidence in support of tensor- or vector-induced GW correlations in the data, and that vector correlations are disfavored. This places an upper bound to the graviton mass, $m_{\rm g} \lesssim 10^{-22}$ eV, characteristic of the PTA GW energy scale. Comment: 6 pages + refs, 3 figures, v2: discussion improved, to appear in PRD Letters, our codes https://github.com/reggiebernardo/PTAfast/tree/main |
| Databáze: | arXiv |
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