Searching for Dark Energy, Dark Matter & Gravitational Radiation

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The search for dark matter, dark energy, and gravitational radiation remains largely inconclusive, with no direct detections reported. Recent experiments hint at potential dark matter detection, but insufficient data prevents definitive claims. There is currently little progress in detecting dark energy, as no serious experiments are underway for direct observation. Gravitational waves may be detected soon if advanced LIGO achieves its design sensitivity, with expectations of frequent detections. Overall, while advancements are being made, the fundamental nature of these phenomena continues to challenge direct detection efforts.
wolram
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How is the search for dark matter, dark energy and gravitational radiation going, as far as i can make
out there has been no direct detection and they remain conjectures
 
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wolram said:
How is the search for dark matter, dark energy and gravitational radiation going, as far as i can make
out there has been no direct detection and they remain conjectures

There has been in the news just the last week or so an experiment that MAY have detected dark matter ... there's a thread on it somewhere here ... try a forum search for some thing like "dark matter found"
 
There have been recent advancements in detecting dark matter. From two different sources. However there's still not enough data to say. Yes we found dark matter.
Not much in detecting dark energy.
By gravitational radiation I am assuming you mean gravity waves. If that's the case then there's been nothing conclusive.

So essentially nothing conclusive to all 3
 
So if the experiment is run for another 2 yrs without detection, would that be a nail in the LCDM coffin?
 
wolram said:
So if the experiment is run for another 2 yrs without detection, would that be a nail in the LCDM coffin?

I'm fairly sure not. It's a bit of a matter of opinion at some point, but I think there's quite a bit of room to lower the cross-section for WIMPs before people start abandoning them altogether.

As for DE, I don't know of any experiment we are seriously pursing for direct detection. The nature of the phenomenon simply doesn't lend itself to easy access. We will very likely confirm the acceleration curves with DES and LSST, and this may provide some interesting data regarding the dark energy equation of state. But regarding direct detection...

Gravitational waves we should see within the next few years. If advanced LIGO turns on, manages to hit their design sensitivity, and runs for even a year or two without making a detection it will be EXTREMELY odd. All signs point to them making detections very roughly on the order of /week/month/day at their design sensitivity.
 
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...
Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
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