Happy Atheist Forum

Dark matter, is it real?

Bluenose

  • ****
  • 1511
  • Gender: Male
  • Final approach to HMAS Melbourne CVS-21 (1980)
    • Native Fish Australia
Dark matter, is it real?
« on: November 18, 2021, 11:41:43 PM »
Found this video, might be of interest to some here. It certainly poses some interesting questions.  I haven't found the paper described in it, but then I have not really looked...   ::)

https://youtu.be/0sTBZ2G4vow
+++ Divide by cucumber error: please reinstall universe and reboot.  +++

GNU Terry Pratchett


Recusant

  • Miscreant Erendrake
  • *****
  • 7588
  • Gender: Male
  • infidel barbarian
Re: Dark matter, is it real?
« Reply #1 on: November 19, 2021, 03:51:00 AM »
Fine stuff, thank you Bluenose. The menagerie of MOND theories is something to behold. There's no denying the entertainment value of watching physicists and cosmologists do mental gymnastics trying to deal with the anomalous galactic rotation speeds. Good for them to have something to chew on.  :thumbsup2:

I noticed that the graphics don't add much to the video, and it works pretty well as a podcast. The host is good at what he does, but I'd say he's a natural for podcasts.  ;)

As for the paper, I don't mind admitting the equations are well beyond me, as is a fair part of the text when it begins blending in with the equations. Those with a superior education may make better headway. It seems to have been published in Physical Review Letters, but I found it on arXiv.

"New Relativistic Theory for Modified Newtonian Dynamics" | arXiv

Quote
We propose a relativistic gravitational theory leading to modified Newtonian dynamics, a paradigm that explains the observed universal galactic acceleration scale and related phenomenology. We discuss phenomenological requirements leading to its construction and demonstrate its agreement with the observed cosmic microwave background and matter power spectra on linear cosmological scales. We show that its action expanded to second order is free of ghost instabilities and discuss its possible embedding in a more fundamental theory.
"Religion is fundamentally opposed to everything I hold in veneration — courage, clear thinking, honesty, fairness, and above all, love of the truth."
— H. L. Mencken


Bluenose

  • ****
  • 1511
  • Gender: Male
  • Final approach to HMAS Melbourne CVS-21 (1980)
    • Native Fish Australia
Re: Dark matter, is it real?
« Reply #2 on: November 19, 2021, 05:26:10 AM »
Fine stuff, thank you Bluenose. The menagerie of MOND theories is something to behold. There's no denying the entertainment value of watching physicists and cosmologists do mental gymnastics trying to deal with the anomalous galactic rotation speeds. Good for them to have something to chew on.  :thumbsup2:

Tank may recall me sitting in his front room back in 2016 saying that I think we are close to a revolution in physics similar in many ways to that caused by Einstein and Co.  Things like this possible resolution to some pretty big cosmological questions as well as some new thinking about the standard model of sub atomic particals suggest, to me at least, that we are about due to a new revolution.  I suspect that like relativity v Newtonian physics where Newtonian physics has been shown to be basically a special case of relativiy, whatever the new physics ends uo being our current understandings will probably become just special cases that work for most examples but beyond certain limits the new stuff will be required.  I hope I live to see some of this.

Quote
"New Relativistic Theory for Modified Newtonian Dynamics" | arXiv

Quote
We propose a relativistic gravitational theory leading to modified Newtonian dynamics, a paradigm that explains the observed universal galactic acceleration scale and related phenomenology. We discuss phenomenological requirements leading to its construction and demonstrate its agreement with the observed cosmic microwave background and matter power spectra on linear cosmological scales. We show that its action expanded to second order is free of ghost instabilities and discuss its possible embedding in a more fundamental theory.


Yeah, that's what I thought...   ::)
+++ Divide by cucumber error: please reinstall universe and reboot.  +++

GNU Terry Pratchett


Dark Lightning

  • *****
  • 2272
  • Gender: Male
  • Curmudgeon
Re: Dark matter, is it real?
« Reply #3 on: November 19, 2021, 02:53:20 PM »
I graduated with a B Sc in physics in '83 and started in on a master's in '84. First up was General Relativity, but I made it about 3 weeks and decided I wasn't going to be the one to update Einstein's work.  ::)  I find the general discussion interesting, but I don't want to bash that math into my head at this late age.

hermes2015

  • *****
  • 3649
  • Gender: Male
Re: Dark matter, is it real?
« Reply #4 on: November 20, 2021, 03:15:56 AM »
I graduated with a B Sc in physics in '83 and started in on a master's in '84. First up was General Relativity, but I made it about 3 weeks and decided I wasn't going to be the one to update Einstein's work.  ::)  I find the general discussion interesting, but I don't want to bash that math into my head at this late age.

I agree with you. I have a BSc in physics and also in chemistry, but at 75 I would rather solve painting and sculpture problems, and try to improve my knowledge of classical music.
“Who is to say that pleasure is useless?”
― Charles Eames

Dark Lightning

  • *****
  • 2272
  • Gender: Male
  • Curmudgeon
Re: Dark matter, is it real?
« Reply #5 on: November 20, 2021, 03:54:58 AM »
I graduated with a B Sc in physics in '83 and started in on a master's in '84. First up was General Relativity, but I made it about 3 weeks and decided I wasn't going to be the one to update Einstein's work.  ::)  I find the general discussion interesting, but I don't want to bash that math into my head at this late age.

I agree with you. I have a BSc in physics and also in chemistry, but at 75 I would rather solve painting and sculpture problems, and try to improve my knowledge of classical music.

 :thumbsup: I'm working on carving skills, with a side order of copper smithing. But I haven't hammered any copper in years. I have some sheets that are calling to me. I would rather just appreciate music, though (listening).

billy rubin

  • humble azpirant to the throne3 of typos
  • *****
  • 3191
  • Gender: Male
  • i actually do not know what LætusAtheos means
Re: Dark matter, is it real?
« Reply #6 on: November 20, 2021, 02:34:34 PM »
I graduated with a B Sc in physics in '83 and started in on a master's in '84. First up was General Relativity, but I made it about 3 weeks and decided I wasn't going to be the one to update Einstein's work.  ::)  I find the general discussion interesting, but I don't want to bash that math into my head at this late age.

I agree with you. I have a BSc in physics and also in chemistry, but at 75 I would rather solve painting and sculpture problems, and try to improve my knowledge of classical music.

attaboy.

the peoplr who never alter their interests go pretty deep, but nevrr very far.


Affecting travellers every year, this bizarre phenomenon sees visitors to Florence suffer psychological breakdowns after being overwhelmed by the city's abundance of great art.