dark matter

Dark Matter mystery solved? And the answer is . . . Ta Da . . . Black Holes! We may finally be able to test one of Stephen Hawking's most far-out ideas https://www.livescience.com/testable-primordial-black-holes-theory OK. So maybe soon then. ;)

https://www.scientificamerican.com/article/is-dark-matter-made-of-axions/ A Scientific American article this morning on my news feed speculates about the possibility that the long-theorized particle, the axion, could be a candidate for dark matter. This has to do with some of the anomalous...

On Sabine Hossenfelder's BackReAction blog, it's titled "Dark matter nightmare: What if we are just using the wrong equations?" (link). At its heart it's about averaging non-linear equations, those in General Relativity (GR) in particular. An extract: As with, it seems, almost all her...

The Observer Effect The unobserved quantum realm doesn't care about time or distance so the order goes something like this: quantum field excitation of a new particle is about to happen it gets assigned a path in the quantum field if the path contains a spacetime enactor (a detector), it...

From The Conversation: Bizarre ‘dark fluid’ with negative mass could dominate the universe – what my research suggests Article: A unifying theory of dark energy and dark matter: Negative masses and matter creation within a modified ΛCDM framework A new extended version of LambdaCDM unifies...

https://www.theguardian.com/science/2018/mar/28/galaxy-without-any-dark-matter-baffles-astronomers My first guess was that the dark matter had got separated out somehow, reading on that's one of the speculations. This is an interesting point:

FYI: Lots of space stuff detected in very clever ways. :) (they did pretty much know it was there...just could not prove it!) From an article in NewScientist:

I recall that there's at least two examples of why dark matter can't bounce off of ordinary matter due to electromagnetic interactions: If dark matter bounced off of ordinary matter, then it bouncing off of gas/plasma clouds would change its distribution and velocities within galaxies to the...

Dark matter continues to evade detection. I've read a few articles lately suggesting theories like Modified Newtonian Dynamics are being taken more seriously. Anyone working in the field have any comments on where things stand/are headed?

This is a continuation from this thread. Thank you for your feedback about Husserl' and Mach. In my opinion it's sometimes difficult to see a pure boundary between some concepts in theoretical physics and philosophy. These days, concepts in physics are also a subject to philosophers. The...

Sorry for cross posting, but I believe this video is of interest to members of several forums. Enjoy!

Gravitational timedilation: clocks on Earth versus clocks in intergalactic space. Time flows differently in different gravitational fields. A clock in a spaceship of lower orbit (hence in a region of stronger gravity) runs more slowly than one in the other ship. Astronauts in the different...

A CERN physicist has an unorthdox theory for the nature of "dark matter" -- extra mass which holds galaxies together. Testing his theory would require accurately measuring precession of Eris' moon Dysnomia...

Hi Guys, Tonight I caught a doco on SBS2 called 'is everything we know about the universe wrong?' I came in after it had started and hadnt planned on watching it, but I was utterly fascinated by the idea of dark matter. Ive heard it said on this forum that ignoring reality is taking away from...

"Using Maupertuis’ form of the principle of least action, Arto Annila has calculated that the brightness of light from Type 1a supernovae after traveling many millions of light-years to Earth agrees well with observations of the known amount of energy in the universe, and doesn’t require dark...

At least in theory? Or, is use of the word "matter" deceptive in that regard? If so, would something made out of dark matter inherently last longer (perhaps be less prone to the effects of entropy, etc.) than anything made out of ordinary matter? (I doubt it, myself, but if anyone can offer...

What do you guys think? How likely is it that this is really happening? I'm getting really excited but am trying to hold it back, I don't want to be disappointed! I keep thinking about dark matter suns and planets moving through us at all times. Maybe even dark matter life forms trying to...

Ok RC, please stop hijacking my Fermi thread. Here's the other thread where you can post to your hearts content on what you believe is "evidence" that "dark matter' is made of some sort of exotic material. Please be specific about your claims and the assumptions made in your claims. Keep in...

I'm curious why astronomers as a group are allowed to simply point at the sky and make stuff up in an ad hoc manner? What empirical evidence demonstrates that "dark matter" releases gamma rays or positrons? Without such empirical validation, what it the world are they doing pointing at the sky...

From here http://www.newscientist.com/article/dn17892-galaxy-study-hints-at-cracks-in-dark-matter-theories.html it seems new data is questioning the prevailing theory of Dark Matter though the article itself urges caution as it is so early. A study of 28 galaxies has uncovered a curious...

Warning: This is wild speculation from someone who probably doesn't know what he's talking about. Please link me to any resources that would set me straight. :) Cliffs Notes: Could the possibility of a fundamental resolution to the universe explain dark matter/energy? Something about the...

Just a question for any physicists or physics aficionados. What are the current theories of what constitutes dark matter? I keep reading articles mentioning how mysterious it is and how its producing unexpected observations in cosmology but hardly a mention of what physicists think it might be.

http://www.sciencedaily.com/releases/2008/09/080918170630.htm

I've started this thread to avoid the Quarks, [OIII], neutron stars, black holes OK; CDM not OK - Huh? thread getting bogged down. Of course the nature of the observational evidence, and the analysis that takes observations and concludes 'here be (lots and lots of) CDM' is relevant to that...

This is a thread to explore an attitude (or opinion) that I continue to find hard to understand every time I encounter it, which is rather often. You are talking with someone who is not an astronomer, nor a physicist (and also not an astrophysicist, etc), and who also does not have a BSc (or...

I just read a neat article in the New York Times about an experiment that claims to be detecting dark matter that the earth is traveling through. According to the times, the experiment is much in the minority, but nonetheless legit, as well as quite interesting. Here's the times article...

http://www.washingtonpost.com/wp-dyn/content/article/2006/08/21/AR2006082101139.html Everything we know, everything we can detect, is only 5% of the entire Universe! - Extraordinary claim! 20% of the Universe is something we can't see or detect, that doesn't obey the laws of physics, except it...

That's a relief! Something about not multiplying entities. Scientists say dark matter doesn't exist (MSNBC) Or maybe not. Any real physicists out there who can explain this better than MSNBC? Thank you.

Taken from: http://www.cnn.com/2007/TECH/space/08/24/universe.hole.ap/index.html An excerpt: "WASHINGTON (AP) -- Astronomers have stumbled upon a tremendous hole in the universe. That's got them scratching their heads about what's just not there. The cosmic blank spot has no stray stars, no...

I found this article interesting: http://www.eurekalert.org/pub_releases/2007-08/cxc-dmm081607.php "Dark matter mystery deepens in cosmic 'train wreck, Public release date: 16-Aug-2007" It states that Then it notes two possible explanations. If the second is what it takes, then the Big...