Could pulsar timing arrays see primordial gravity waves?

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SUMMARY

Pulsar timing arrays, specifically the European Pulsar Timing Array (EPTA) and International Pulsar Timing Array (IPTA), may have the potential to detect primordial gravitational waves. The detection methods discussed include indirect observation through Cosmic Microwave Background (CMB) polarization and direct observation using large-scale space-based interferometers like the Big Bang Observer. Current understanding indicates that while the possibility exists, the actual amplitude of primordial gravitational waves remains uncertain, which complicates detection efforts.

PREREQUISITES
  • Understanding of gravitational wave physics
  • Familiarity with pulsar timing techniques
  • Knowledge of Cosmic Microwave Background (CMB) polarization
  • Awareness of space-based interferometry concepts
NEXT STEPS
  • Research the methodologies of the European Pulsar Timing Array (EPTA)
  • Explore the capabilities and design of the Big Bang Observer
  • Study the implications of Cosmic Microwave Background (CMB) polarization on gravitational wave detection
  • Investigate current findings on the amplitude of primordial gravitational waves
USEFUL FOR

Astronomers, astrophysicists, and researchers interested in gravitational wave detection and the study of the early universe will benefit from this discussion.

windy miller
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Im wondering if pulsar arrays could see primordial gravity waves?
I have understood the only way to seem them would be to
a) via indirect imprint on CMB polarisation
b) direct viewing via some gigantic space based interferometer like Big Bang Observer
However I was looking at this image: https://upload.wikimedia.org/wikipe..._astrophysical_gravitational-wave_sources.png
and it seems to imply pulsar timing array projects like EPTA and IPTa might have a shot at it. Have I misunderstood this or is this a genuine possibility?
 
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It's potentially possible, but nobody yet knows what the level of primordial gravity waves is. They could be a lot smaller than would be required to detect them this way.