Showing posts with label dark matter. Show all posts
Showing posts with label dark matter. Show all posts

Thursday, July 31, 2008

Dark Black Hole?

This is not really a blog post- more a question. Those who peruse the blog will know i have no real grasp of physics but at least i am interested in these deep questions.

I'm also fascinated by how extraordinary things can become mundane: Antimatter? Big Deal! it's got the wrong charge- otherwise almost the same as ordinary stuff. Black Holes? boring - there's one in the middle of every galaxy. Wave-particle duality? Meh! When you don't look, it's a wave- when you look it's a particle. Easy. Like Alice in Wonderland, you really can "Believe six impossible things before breakfast.".

The hip cool stuff now is dark matter and dark energy .. and i was wondering ... can you get a black hole forming from the gravitational collapse of dark matter? Presumably, it doesn't interact strongly enough with gravity to form dark matter planets, stars, galaxies.. but is this just because the universe is only 14.7 billion years old? Given enough time, wouldn't it start to clump like non-dark matter?

Discuss.



Monday, November 07, 2005

What is the Universe Made of?

http://upload.wikimedia.org/wikipedia/commons/4/4b/DarkMatterPie.jpg
Most of the universe is apparently made of 'dark energy', a small percentage is 'dark matter'.. and the tiny remainder is made of 'particles' (mostly matter with a tiny bit of anti-matter). A small proportion of particles go to making atoms- of which the most abundant is the simplest- hydrogen. Anything more complicated has to be created inside supernova star explosions before it can coalesce into planets from which living humans can evolve, gaze out into the universe and invent vengeful gods to explain it all away.
This is a great website that goes through the "standard model" of particle physics.

Things i have trouble understanding:
1) what is 'spin'?
2) why there are 3 generations of matter? (reminiscent of a medieval 'hierarchy of angels'?)
3) what causes a particle to have a certain mass? and what the hell is a Higgs Boson?
As a separate issue- hese particles keep popping in and out of existence at random- creating particle/anti-particle foam out of so-called "empty" space.