Is Dark Matter merely Inactive Matter?

February 5, 2017 — 2 Comments

Dark Matter – cuspy core problem.

Proposed solution is that dark matter wakes up, turns into matter and then self repels/forms stars, etc.This means no cusp is found.

Note how in the most tenuous gas clouds (well cold ones – the hot tenuous galactic halo does not count as its a supernova effect), the density is the exact same as the dark matter density?

From https://arxiv.org/pdf/1404.1938.pdf – note how dark matter is about about 0.2 protons per cm^3 (BR 13 measurement) . One would think that in the disk of the milky way, this close to the galactic core that the DM density is about as large as it gets. Which seems right:

screen-shot-2017-02-05-at-8-08-27-pm

The Dark Matter Halo of the Milky Way, AD 2013 – https://arxiv.org/pdf/1304.5127v2.pdf

We find that the cored profile is the preferred one, with a shallow central density of ρH ∼ 4 × 107M⊙/kpc3 and a large core radius RH ∼ 10kpc, as observed in external spirals and in agreement with the mass model underlying the Universal Rotation Curve of spirals.

From wikipedia https://en.wikipedia.org/wiki/Interstellar_medium

Note how the lowest density clouds are 0.2 – 0.5 protons/cm^3

Why is this the same density? Answer: The dark matter has a maximum density, if density gets higher it lights up and turns into protons/electrons/H – which results in WIM and WNM clouds. Dark matter might be sleeping matter.

screen-shot-2017-02-05-at-8-08-04-pm

There is a problem – what heats the Warm Ionized Medium?

Journal, T. A. (2000). EVIDENCE FOR AN ADDITIONAL HEAT SOURCE IN THE WARM IONIZED MEDIUM OF GALAXIES, (Rand 1998), 1997–2000.

Dark Matter waking up might naturally result in WIM over WNM.

Also see https://gravityphysics.com/2013/10/20/how-to-make-dark-matter/

 

Update:

You can see a clear (well kinda clear -its astronomy data…) cut at 0.04 electrons (ie protons too) per cm3. http://www.astro.wisc.edu/wham/papers-dir/hill_sins.pdf

Screen Shot 2017-10-08 at 6.48.43 PM

To me this is exciting. WIM has a density wall at about 0.02 particles / cm3 – while dark matter has a density of about the same number (within a factor of 10).

The maximum density of dark matter is about equal to the low-density wall of WIM.

Dark matter does not exist at high densities. So on a galaxy rotation curve, ie

http://iopscience.iop.org/article/10.1088/1742-6596/566/1/012008/pdf

ie – right at about the 15 kPc mark. Dark matter really not needed much below 10 kPc at all. Dark matter turns into regular matter at about these distances. Clumps of regular matter (which is how they get the rotation curves) are centers for DM – regular matter promotion. This promotion results in anomalous heating of the WIM.

Screen Shot 2017-10-08 at 7.22.21 PM

 

Also see: – the ionizing problem is still around. The O star theory seems kinda weak…

http://w.astro.berkeley.edu/~ay216/08/NOTES/Lecture08-08.pdf

Thus O stars are able to ionize the WIM (other obvious sources of Ionizing radiation are weaker), but how do the ionizing photons get from the location of these stars in the thin disk of the Milky Way to far above the mid-plane?

 

 The Li^7 problem ( https://arxiv.org/pdf/1203.3551.pdf ) might be solved if Li 7 somehow does not sleep. Then there would be more of it. Or more likely its all the same but the heavier stuff is easier to re-activate and thus collapses into star-forming more often than H or He.
Update:  remarks on the ‘Superfluid’ solution to dark matter. 
Sabine:
Their new calculations take into account that in general the dark matter will be a mixture of superfluid and normal fluid, and both phases will make a contribution to the gravitational pull. Just what the composition is depends on the gravitational potential (caused by all types of matter) and the equation of state of the superfluid. In the new paper, the authors parameterize the general effects and then constrain the parameters so that they fit observations.
 The gravitational potential is not even supposed to be detectable! In Physics, potentials are not gravitationally even locally detectable – which is why a bird can sit on a high voltage wire.
There are other problems with the superfluid:
From Uncle Al:
1) Why isn't the condensate irreversibly scavenged by the central black hole, and others, over redshift? Black holes should be visibly snacking between meals.
... 2) Added thermodynamic degrees of freedom are spectroscopically invisible?
... 3) The condensate remains unperturbed by compact-body mergers, not perturbing LIGO waveforms?

Yet the theory does solve the cuspy core problem, etc – and you can see why…

The main reason I find this idea convincing is that it explains why some observations are easier to account for with dark matter and others with modified gravity: It’s because dark matter has phase transitions! It behaves differently at different temperatures and densities.

In solar systems, for example, the density of (normal) matter is strongly peaked and the gradient of the gravitational field near a sun is much larger than in a galaxy on the average. In this case, the coherence in the dark matter fluid is destroyed, which is why we do not observe effects of modified gravity in our solar system. And in the early universe, the temperature is too high and dark matter just behaves like a normal fluid.
They are scratching all around it. Dark Matter does change phase – into ordinary matter. There is a phase of ordinary matter that does not have the energy to engage with photons – its darkened matter.

–Tom

Trackbacks and Pingbacks:

  1. Another mechanism for the Baryonic Tully–Fisher Relation « Emergent Physics - February 24, 2018

    […] other posts, I have wondered if dark matter is ‘sleeping regular matter‘ and I still think that it may be a viable option, but it seems like any explanation in terms […]

  2. Yet another Tully-Fisher dark matter explanation « Emergent Physics - February 25, 2018

    […] centimeter scale used by astronomers when dealing with matter clouds) see my earlier related post  Is Dark Matter merely Inactive Matter?  so about 1003 or a million times the density of dark […]

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