B Gravitational Wave Background: The Mysteries of the Universe

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Recent discussions highlight significant advancements in understanding gravitational wave backgrounds and their implications for physics and cosmology. The Nanograv organization is noted for generating datasets from pulsar arrays, which are crucial for analyzing gravitational waves. Various authors are interpreting this data, contributing to breakthroughs in our understanding of the universe's evolution. Relevant research papers and resources, such as those found on ARXIV and ADS, provide further insights into these developments. This area of study is gaining traction as a promising field for future discoveries in astrophysics.
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Pulsars as galaxy-wide "sensors" for net gravitational wave background
I don't know if this is the ideal sub-forum for this but I'd like to know more about this very recent activity I first saw here >>>>>'



It looks like this could be some actually testable, actual breakthrough advances in Physics and the evolution of our Universe. Any comments appreciated.
 
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Google finds http://nanograv.org/ with some background information.

It appears that that organization generates a dataset from the array of pulsars, and other authors attempt to analyze the data and interpret the result. I'm not familiar with the topic, but Google did find https://ui.adsabs.harvard.edu/abs/2020ApJ...900..102A/abstract as one such example, I don't have a complete set of such analsyis or have any idea of how well they analyses have been accepted.
 
In Birkhoff’s theorem, doesn’t assuming we can use r (defined as circumference divided by ## 2 \pi ## for any given sphere) as a coordinate across the spacetime implicitly assume that the spheres must always be getting bigger in some specific direction? Is there a version of the proof that doesn’t have this limitation? I’m thinking about if we made a similar move on 2-dimensional manifolds that ought to exhibit infinite order rotational symmetry. A cylinder would clearly fit, but if we...