B Gravitational Wave Background: The Mysteries of the Universe

enorbet
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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.
 
Physics news on Phys.org
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 this video I can see a person walking around lines of curvature on a sphere with an arrow strapped to his waist. His task is to keep the arrow pointed in the same direction How does he do this ? Does he use a reference point like the stars? (that only move very slowly) If that is how he keeps the arrow pointing in the same direction, is that equivalent to saying that he orients the arrow wrt the 3d space that the sphere is embedded in? So ,although one refers to intrinsic curvature...
So, to calculate a proper time of a worldline in SR using an inertial frame is quite easy. But I struggled a bit using a "rotating frame metric" and now I'm not sure whether I'll do it right. Couls someone point me in the right direction? "What have you tried?" Well, trying to help truly absolute layppl with some variation of a "Circular Twin Paradox" not using an inertial frame of reference for whatevere reason. I thought it would be a bit of a challenge so I made a derivation or...
I started reading a National Geographic article related to the Big Bang. It starts these statements: Gazing up at the stars at night, it’s easy to imagine that space goes on forever. But cosmologists know that the universe actually has limits. First, their best models indicate that space and time had a beginning, a subatomic point called a singularity. This point of intense heat and density rapidly ballooned outward. My first reaction was that this is a layman's approximation to...
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