Could pulsar timing arrays see primordial gravity waves?

In summary, the conversation discusses the potential for pulsar arrays to detect primordial gravity waves. The only ways currently known to detect these waves are through indirect imprint on CMB polarisation or direct viewing via a space-based interferometer. However, the image provided suggests that pulsar timing array projects like EPTA and IPTa may also have a chance at detecting them. However, it is not yet known what the level of primordial gravity waves is, and they may be too small to be detected through this method.
  • #1
windy miller
301
25
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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  • #2
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.
 

1. What are pulsar timing arrays?

Pulsar timing arrays are a collection of radio pulsars that are used to detect and study gravitational waves. These are rapidly rotating neutron stars that emit beams of radio waves, which can be detected on Earth.

2. How can pulsar timing arrays detect primordial gravity waves?

Primordial gravity waves are ripples in the fabric of spacetime that were generated during the early universe. These waves produce very subtle changes in the timing of pulsar signals, which can be measured by pulsar timing arrays.

3. What is the significance of detecting primordial gravity waves using pulsar timing arrays?

Detecting primordial gravity waves using pulsar timing arrays can provide valuable insights into the early universe and help us understand the fundamental laws of physics. It can also confirm the theory of cosmic inflation, which describes the rapid expansion of the universe after the Big Bang.

4. How sensitive are pulsar timing arrays in detecting primordial gravity waves?

Pulsar timing arrays are highly sensitive and can detect changes in the timing of pulsar signals at a level of nanoseconds or even smaller. This level of precision is necessary to detect the extremely faint signals of primordial gravity waves.

5. Are there any challenges in using pulsar timing arrays to detect primordial gravity waves?

Yes, there are several challenges in using pulsar timing arrays to detect primordial gravity waves. These include the need for a large number of pulsars, accurate measurements of their signals, and the ability to separate the signal from other sources of noise. However, advancements in technology and data analysis techniques are helping to overcome these challenges.

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