Can Energy Density in Deep Space Vacuums Be Measured?

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Measuring energy density in deep space vacuums is a complex challenge due to the extremely small energy density of dark energy. Current methods focus on observing its effects on large scales rather than direct measurement. Cosmological studies, including type Ia supernovae and gravitational lensing surveys, are key to understanding dark energy's influence. While the question may seem abstract, it highlights the ongoing efforts in astrophysics to quantify cosmic phenomena. The pursuit of measuring energy density remains a significant area of research in cosmology.
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If one could find the deepest void in space, could the energy in a set volume be measured calculated?

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Is this a nonsense question? i will try again if you think so.
 
The energy density of the dark energy is extremely small and, at the moment, it's only feasible to measure its effects on very large scales. A great many cosmological studies are currently devoted to measuring these effects (e.g. type Ia supernovae, gravitational lensing surveys).
 
https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...

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