# dark matter

1. Thread

### A Three dimensional representation of $U(1)\times SU(2)$

Consider a three dimensional representation of $U(1)\times SU(2)$ with zero hypercharge $Y=0$:  L= \begin{pmatrix} L^+ \\ L^0 \\ L^-...
Thread by: Ramtin123, Sep 18, 2018, 6 replies, in forum: High Energy, Nuclear, Particle Physics
2. Thread

### B Known properties and constraints of dark matter

I'm wondering what properties of Dark Matter are known for certain. Such as: How much does it collide with itself, and with ordinary matter? What...
Thread by: SlowThinker, Jun 16, 2018, 11 replies, in forum: Astronomy and Astrophysics
3. Thread

### I Are displaced dark matter and curved spacetime same thing?

If dark matter is a supersolid that fills 'empty' space and is displaced by visible matter, then is this the same notion as the spacetime fabric...
Thread by: Luke W, Jun 5, 2018, 12 replies, in forum: General Physics
4. Thread

### I "Centaurus A Contradicts Dark Matter Models"

According to the article in Astronomy Magazine June 2018, the satellite galaxies of Centaurus A are rotating in the same direction in a...
Thread by: megacal, May 2, 2018, 4 replies, in forum: Cosmology
5. Thread

### A Generalized free fields as dark matter?

@vanhees71 reminds us that The only interpretation of particles is in terms of asymptotic free states, and the observable predictions are in...
Thread by: Peter Morgan, Apr 6, 2018, 4 replies, in forum: Quantum Physics
6. Thread

### I Is a galaxy's halo displaced dark matter?

Scientists Thought All Galaxies Had Dark Matter, but They Just Found One Without It Could dark matter fill 'empty' space, strongly interact with...
Thread by: Mike Johnson, Apr 4, 2018, 1 replies, in forum: Cosmology
7. Thread

### I Does space have its own density?

Does space have its own density? i.e. a mass density distinct from the mass density of 'particles' in it? or may it have a uniform density of some...
Thread by: David Dodson, Mar 11, 2018, 1 replies, in forum: Cosmology
8. Physics and Math Videos

### The Big Picture: From the Big Bang to the Meaning of Life - with Sean Carroll

The talk, given at the Royal Institution in October 2016, will take us on a breath-taking journey from the origin of the Universe, through the...
Uploaded by: Wrichik Basu, Feb 11, 2018, 0 comments, in category: Astronomy and Cosmology
9. Physics and Math Videos

### Q&A The Big Picture - with Sean Carroll

Dr Sean Carroll is an astrophysicist at the California Institute of Technology. He has written a variety of popular science books along with...
Uploaded by: Wrichik Basu, Feb 11, 2018, 0 comments, in category: Astronomy and Cosmology
10. Thread

### Could Dark Matter be H or He? They are pervasive

Hydrogen and Helium are pervasive throughout our universe so their interaction with light is universal too. Dark Matter has been theorized to not...
Thread by: David Roberts, Jan 20, 2018, 11 replies, in forum: Astronomy and Astrophysics
11. Thread

### I If Dark Matter and Dark Energy exist, what produces them?

My query is really to find out what everybody thinks about 'empty space'. Does dark matter/energy exist and if so, it fills all voids in the...
Thread by: pixelperfect, Jan 11, 2018, 9 replies, in forum: Cosmology
12. Thread

### Does the event horizon of a black hole really represent the surface of the star/mass?

Does the event horizon of a black hole really represents the surface of the "star" (or mass) itself? What I mean to say is: That the event horizon...
Thread by: Philippos, Jan 7, 2018, 15 replies, in forum: Astronomy and Astrophysics
13. Thread

### I Dark matter and energy may not exist?

https://www.sciencedaily.com/releases/2017/11/171122113013.htm How plausible does this seem?
Thread by: Phys12, Nov 26, 2017, 1 replies, in forum: Astronomy and Astrophysics
14. Thread

### I Why not detect dark matter in our own galaxy?

Wikipedia dixit: The standard model of cosmology indicates that the total mass–energy of the universe contains 4.9% ordinary matter, 26.8% dark...
Thread by: alejandromeira, Aug 25, 2017, 12 replies, in forum: Cosmology
15. Thread

### A Erebons: Planck mass Dark Matter particles

Erebon theory is a novel explanation of dark matter recently invented by Roger Penrose. Erebons are scalar particles of the order of a Planck mass...
Thread by: Auto-Didact, Aug 7, 2017, 6 replies, in forum: Beyond the Standard Model
16. Thread

### A Penrose: Noise in LIGO signal implies CCC

Roger Penrose, July 2017. Correlated "noise" in LIGO gravitational wave signals: an implication of Conformal Cyclic Cosmology It has recently been...
Thread by: Auto-Didact, Jul 19, 2017, 11 replies, in forum: Astronomy and Astrophysics
17. Thread

### I Dark Matter Interactions

As I have come to understand it - we have no current means of directly interacting with Dark Matter. We can only observe the gravitational...
Thread by: Zguy1217, Jun 26, 2017, 29 replies, in forum: Cosmology
18. Thread

### B Can the vacuum density produce only normal matter?

Without knowing whether WIMPs or axions or something else are what dark matter is composed of, can we speculate about the vacuum density creating...
Thread by: Dr Aaron, Jun 22, 2017, 8 replies, in forum: Beyond the Standard Model
19. Thread

### I Why does physical space have to be three-dimensional?

There's a question that's been in my mind for quite a while but I cannot figure out what the answer is. I't probably an ill posed question but I...
Thread by: Carlos L. Janer, Jun 6, 2017, 12 replies, in forum: Cosmology
20. Thread

### B Dark matter and energy creation

If space is expanding and at the same time speeding up, something must be driving it. It also appears to be self perpetuating, as something cannot...
Thread by: John M, Jun 6, 2017, 5 replies, in forum: Cosmology
21. Thread

### A Tension between recent dark matter results and Lux-Xenon?

How much tension between recent AMS-02 80 Gev dark matter and Lux-Xenon negative results? Recent results ( Arxiv 1610.03840 and 1704.08258)...
Thread by: jimgraber, May 17, 2017, 1 replies, in forum: Astronomy and Astrophysics
22. Thread

### I Dark Matter or Modified Gravity theories?

Dark Matter was never found, what Modified Gravity theories should we check now?
Thread by: Fred Bett, Apr 14, 2017, 4 replies, in forum: Special and General Relativity
23. Thread

### B What are the most likely ways of finding Dark Matter?

What will the scientific experiment look like that finds Dark Matter? Before then, what scientific/technological advancements will need to be made...
Thread by: FelixH, Mar 2, 2017, 10 replies, in forum: Cosmology
24. Thread

### I Further Evidence of a 3.5 keV line in Galactic X-Ray Spectra

That pesky 3.5 keV line just won't go away. The authors note that it's compatible with dark matter composed of 7.02 keV sterile neutrinos. If...
Thread by: MrRobotoToo, Feb 18, 2017, 4 replies, in forum: Beyond the Standard Model