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Constraining gravitational wave propagation using pulsar timing array correlations
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abstract
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.
Forward citations
Cited by 2 Pith papers
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Probing Graviton Mass with MeerKAT PTA and SKA--PTA Forecasts
MPTA 4.5-year data imply a 90% upper bound of mg < 2.1 × 10−23 eV/c2, consistent with massless gravitons; SKA-PTA could reach ~10−25 eV/c2.
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Do Pulsar Timing Datasets Favor Massive Gravity?
A one-parameter massive-gravity correlation curve gives lower chi-square than the Hellings-Downs curve for current pulsar-timing data, but the parameter is fitted to the data, so the result is not a prediction.
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