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<blockquote data-quote="freyar" data-source="post: 6823098" data-attributes="member: 40227"><p>Those TAPIR pages at Caltech are really great.&nbsp; Anyway, I just wanted to mention that relic background.&nbsp; There's a relic background of neutrinos (not yet observed), gravitational waves (not yet observed), and light (observed very precisely all the time).&nbsp; The gravitational wave background may eventually be detected by looking at pulsars, which are neutron stars that rotate and pulse with a well-determined period that would be affected by gravitational waves.&nbsp; The other way the gravitational wave background could be detected is through its influence on the polarization of the relic background light.&nbsp; If you remember a big fuss (from the BICEP2 collaboration) about two years ago, that was because one experiment thought they had detected this effect.&nbsp; However, another experiment showed that they just measured dust.&nbsp; Anyway, that's something LIGO can't measure but would be another very interesting.</p></blockquote><p></p>

[QUOTE="freyar, post: 6823098, member: 40227"] Those TAPIR pages at Caltech are really great. Anyway, I just wanted to mention that relic background. There's a relic background of neutrinos (not yet observed), gravitational waves (not yet observed), and light (observed very precisely all the time). The gravitational wave background may eventually be detected by looking at pulsars, which are neutron stars that rotate and pulse with a well-determined period that would be affected by gravitational waves. The other way the gravitational wave background could be detected is through its influence on the polarization of the relic background light. If you remember a big fuss (from the BICEP2 collaboration) about two years ago, that was because one experiment thought they had detected this effect. However, another experiment showed that they just measured dust. Anyway, that's something LIGO can't measure but would be another very interesting. [/QUOTE]

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