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Forecasting the sensitivity of Pulsar Timing Arrays to gravitational wave backgrounds
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Pulsar Timing Array (PTA) observations hinted towards the existence of a stochastic gravitational wave background (SGWB) in the nHz frequency band. Still, the nature of the SGWB signal cannot be confidently inferred from current data, and the leading explanation invokes mergers of supermassive black holes. If confirmed, such discovery would not only represent a turning point in our understanding of astrophysics, but it may severely limit the capability of searching for additional cosmological sources in the nHz frequency range. In this work, we build a simple framework to forecast the sensitivity of future PTA configurations and assess the parameter estimation of SGWB, which could consist of several contributions. We release the python code fastPTA implementing this framework and ready to use.
Forward citations
Cited by 7 Pith papers
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Pulsar Timing Array Sensitivity to Anisotropy: Empirical Sensitivity Curves, Scaling Relations, and the Multi-Resolution Pixel Basis
PTA anisotropy sensitivity scales as Npsr^0.8, delta-t^-0.08, and angular-scale exponents 1.6 to 2.1, and a new multi-resolution pixel basis is demonstrated.
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Likelihoods for Stochastic Gravitational Wave Background Data Analysis
Gaussian likelihood approximations used in stochastic gravitational-wave background searches can bias parameter estimates when the number of data segments is small, and for LISA and pulsar timing arrays the bias can e...
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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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Cosmic Variance in Anisotropy Searches at Pulsar Timing Arrays
Cosmic variance does not create false anisotropy detections in pulsar timing array searches when the correct likelihood is used, and the maximum resolvable multipole scales as the number of pulsars rather than its squ...
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Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
A Bayesian analysis shows that a future sub-solar PBH detection would make the primordial SIGW interpretation of PTA data favored over the SMBH interpretation, but this preference is driven by the detection prior.
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\texttt{GWBird}: a toolkit for the characterization of the Stochastic Gravitational Wave Background for Ground, Space, and Pulsar Timing Array detectors
A new, unified Python package computes overlap reduction functions, power-law integrated sensitivity curves, and angular sensitivity curves for ground, space, and pulsar timing array detectors across all gravitational...
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Whispers from the Early Universe: The Ringdown of Primordial Black Holes
The stochastic gravitational wave background from primordial black hole ringdown could be observable by future pulsar timing arrays for solar-mass and heavier black holes, with binary merger signals within reach of ne...
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