APOD: Baryon Acoustic Oscillations from... (2014 Jan 20)

Comments and questions about the APOD on the main view screen.
User avatar
Chris Peterson
Abominable Snowman
Posts: 16666
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Baryon Acoustic Oscillations from... (2014 Jan 20)

Post by Chris Peterson » Tue Jan 21, 2014 2:40 am

Dustin M. wrote:If there hasn't been any research yet into the idea that there could be a repulsive force in those voids pushing the universe away then how can we be so sure that this isn't the case and that it has to be something that happened a long time ago but is not occurring any more? if the repulsive force of dark energy pervades the universe on a massive scale then maybe it could be distributed similar to these voids? Not saying that this is the case, but I don't see how it can be eliminated if no one knows for sure.
There isn't going to be any research along those lines unless somebody develops a theory that would justify the effort. We currently have a very well supported cosmological model that explains the voids and filaments. Research is directed towards improving that model, not following tangents that don't have any supporting theory and are unlikely to yield any useful results.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
Psnarf
Science Officer
Posts: 317
Joined: Fri Feb 26, 2010 6:19 pm

Re: APOD: Baryon Acoustic Oscillations from... (2014 Jan 20)

Post by Psnarf » Wed Jan 22, 2014 3:56 pm

Also, Psnarf, you have out Psnarfed yourself.
We aim to interest, elevate, and/or amuse. I was worried that some of the references were somewhat obtuse. There exists people who have never watched an episode of "Star Trek - Deep Space Nine" so they wouldn't know that "Quark" is the name of the Ferengi who runs the bar and holodecks. I didn't properly cite the panel taken from a Dilbert cartoon. I appreciate your positive remarks.

I saw a NOVA episode (youtube?) that depicted the Big Bang putting forth the proposition that the earliest rate of expansion was faster than light. I wonder what slowed it down, or if the surface containing the universe is still expanding faster than light. I imagine that it would have to because what happens when the light from the earliest stars and galaxies (Hubble Deep field, for example) reaches the edge? We can never know the nature of the edge of the Universe, so it's just a thought experiment. Would the photons reflect/refract, get absorbed, pass through into that which does not exist? Someone speculated that at the quantum level, a photon exists everywhere until an observation collapses the everywhere photon into a point. The earliest galaxies we can detect are also sending photons in the opposite direction, where they would never be detected, unless they reflected off the boundary.
Sound propagates as a pressure wave. The black-box microwave radiation is everywhere, there is no surface to be affected by the pressure waves.

Gravity lensing is observed beyond the edges of the galaxy containing the super-massive black hole. If the lensing occurs via photon refraction passing through a denser region of space-time with a curved shape with a maximum at the center of the galaxy tapering off beyond the visible region '()' then perhaps we have underestimated the gravitational influence of the central black hole? If that is the case, we wouldn't need dark stuff to explain why a galaxies don't fly apart. I need to cogitate the matter more deeply before I can explain to myself what the heck I'm talking about, this nonsense of space-time density forming a convergent (plano-convex) lens around a galaxy.

User avatar
Chris Peterson
Abominable Snowman
Posts: 16666
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Baryon Acoustic Oscillations from... (2014 Jan 20)

Post by Chris Peterson » Wed Jan 22, 2014 4:43 pm

Psnarf wrote:There exists people who have never watched an episode of "Star Trek - Deep Space Nine" so they wouldn't know that "Quark" is the name of the Ferengi who runs the bar and holodecks.
Well, yes. But are such people even worth engaging with?
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
Psnarf
Science Officer
Posts: 317
Joined: Fri Feb 26, 2010 6:19 pm

Re: APOD: Baryon Acoustic Oscillations from... (2014 Jan 20)

Post by Psnarf » Sat Jan 25, 2014 4:05 pm

TRVTH