Dark Matter

Question about Dark Matter in our galaxy. A couple of years before we discovered Nineteen newly dwarf galaxies seem to be missing their dark matter, and physicists aren’t sure why.

Nineteen newly discovered dwarf galaxies seem to be missing their dark matter, and physicists aren’t sure why.

The find dramatically increases the number of galaxies that appear to be missing dark matter, the mysterious, invisible stuff that exerts a gravitational pull, yet emits no light. Dark matter is thought to be a key ingredient in galaxy formation, with its gravity pulling together atoms of gas to form galaxies. Question about Dark Matter, We can tell dark matter is present in a galaxy because it makes the matter in that galaxy swirl faster than it would if the matter we see made up the galaxy’s whole mass. This faster swirling has shown up in every galaxy that could be precisely measured. Recently, however, researchers have found that certain small galaxies, now including these 19, behave as if they’re dominated by baryons — the particles that make up ordinary matter. The evidence for their unseen halos of dark matter is missing. This will lead to question about Dark Matter.

1) What is dark matter?

First and perhaps most perplexingly, researchers remain unsure about what exactly dark matter is. Originally, some scientists conjectured that the missing mass in the universe was made up of small faint stars and black holes, though detailed observations have not turned up nearly enough such objects to account for dark matter’s influence, as physicist Don Lincoln of the U.S. Department of Energy’s Fermilab previously wrote for Live Science.

The current leading contender for dark matter’s mantle is a hypothetical particle called a Weakly Interacting Massive Particle, or WIMP, which would behave sort of like a neutron except would be between 10 and 100 times heavier than a proton, as Lincoln wrote. Yet, this conjecture has only led to more questions ­ — for instance…

2) Can matter and antimatter be present in equal amounts on large scale structure?

Question about Dark Matter. In fact, we can imagine a “natural” scenario in which the antimatter and matter are present in equal amounts on a large scale. When we linearize the general relativity, we obtain a theory very similar to Maxwell’s idealization of electromagnetism.

In this way, with the bold assumption that the antimatter is the negative gravitational mass (but always positive inertial mass), we are in an idealization where the particles of opposite charge (mass) repel themselves (and the same charge attract themselves).

This solution leads necessarily too early inflation and a structure of several universes of homogeneous gravitational mass, alternatively positive and negative. Furthermore, this explanation could explain dark energy.
Last year, I published a paper on this idealization (https://hal.archives-ouvertes.fr/ensl-01122689v1) that explains all of this.

3) Is it really “dark matter”?

Harvey et al. made a study of 30 cluster collisions, with 72 substructures, whereof a spectacular and symmetric case is the Bullet Cluster.
However, this information is biased since the beginning, because in the paper, D. Harvey et al. uses the word “dark matter” as if it were a well-established fact, and didn’t thoroughly analyze all the possibilities.

One can’t even find “dark matter” nearby in the Milky Way. So, my guess is that if one pretends ‘finding’ it at 3.7 billion light-years away, it is a presumptuous allegation and a dangerous precedent.
The data is found from three sources: gravitational bending (blue), X-rays (pink) and visible stars (yellow).
Is it possible to look at the phenomenon in a non-biased way and find other options?

4) Why is dark matter research so unfairly prejudiced?

Question about Dark Matter it’s always there and It is scientifically desirable to include stellar scale dark matter candidates, such as stellar-mass and planetary-mass ultracompact objects, in discussions of the quest for the identity of the enigmatic dark matter comprising the overwhelming majority of matter in the cosmos.
After 40 years of failed attempts to find the ad hoc “WIMPs”, or any other form of subatomic dark matter particles, maybe it is time to completely reassess what the dark matter might be.
Mike Hawkins has offered a cogent empirically-supported case for stellar-mass and planetary-mass ultracompact (with primordial black holes being the most likely candidates) as the mystery objects causing microlensing events seen in the bulge,

A huge population of primordial black holes satisfies the non-baryonic constraint, might also explain where cosmic rays primarily come from and might explain why the ARCADE-2 experiment found an unexplained factor-of-6 excess in cosmological radio emission. Primordial black holes also might constitute the sources of the approximately 6,000/day Fast Radio Bursts that have been discovered/inferred in the last few years by several astrophysical research groups (Science News, Aug. 9, 2014 issue; many papers subsequently posted to arxiv.org). 

It is a scientific error to assume, as most theoretical physicists do, that the dark matter absolutely must be composed of hypothetical subatomic particles. A scientist maintains an open mind, in word and deed. Moreover, a scientist does not condone the denial of important and confirmed empirical results.
Not long ago microlensing research (MOA group) identified at least 0.1 trillion unbound planetary-mass objects in unknown physical states (Suni et al, Nature, May 2011).
Astrophysicists have discovered an estimated 70 billion brown dwarf objects in the thin disk of the Galaxy. Since the thin disk represents a very small fraction of the Galaxy’s volume, one can be reasonably sure that 70,000,000,000 is a lower limit. Question about Dark Matter

5) Does dark matter consist of more than one particle?

Ordinary matter is made up of everyday particles like protons and electrons, as well as a whole zoo of more exotic particles like neutrinos, muons, and pions.

So, some researchers have wondered if dark matter, which makes up 85 percent of the matter in the universe, might also be just as complicated. “There is no good reason to assume that all the dark matter in the universe is built out of one type of particle,” physicist Andrey Katz of Harvard University said to Space.com.

Dark protons could combine with dark electrons to form dark atoms, producing configurations as diverse and interesting as those found in the visible world, Katz said. While such proposals have increasingly been imagined in physics labs, figuring out a way to confirm or deny them has so far eluded scientists. [Strange Quarks and Muons, Oh My! Nature’s Tiniest Particles Dissected]

Physicists said the only way to figure out what’s going on is to study these galaxies in much more detail using different tools and confirm that what seems to be happening there is really happening.

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