dark energy

[richerrich]

1. Is it possible that dark energy didnt originate from bigbang but from another that precedes the bigbang?

2. Are dark energy and dark matter in our solar system?

Thank you very much

[Waveparticle]

I cant answer question number one because nobody knows and their is no possible way to test that yet. As for question number two the answer is yes. Dark matter and dark energy make up 95% of the universe while the matter we know makes up the rest.

[Kevin_Axion]

95% of the mass-energy content in the Universe.

[richerrich]

I cant answer question number one because nobody knows and their is no possible way to test that yet. As for question number two the answer is yes. Dark matter and dark energy make up 95% of the universe while the matter we know makes up the rest.

2.1 If so then dark matter must be affecting something in our solar system. Or some observation of gravitational lensing between stars in our galaxy has been observed not just between galaxies. Dark matter may have altered some planet's orbit.

2.2 If dark energy is in our solar system or galaxy could there be any evidence? Is dark energy only observable between galaxies?

[nicksauce]

If so then dark matter must be affecting something in our solar system. Or some observation of gravitational lensing between stars in our galaxy has been observed not just between galaxies. Dark matter may have altered some planet's orbit.

The amount of dark matter in our solar system, if it is similar to the average galactic density, would be about a kilogram or so, I think. Wouldn't be able to affect anything.

[Nabeshin]

The amount of dark matter in our solar system, if it is similar to the average galactic density, would be about a kilogram or so, I think. Wouldn't be able to affect anything.

Don't know about that, but it is small.

Using the value from [1] for a density of 0.39 GeV/cm^3 and a characteristic solar system scale of about 100AU, I get a total energy ~ 10^35 J, or dividing by c^2, ~10^18 kg. At any rate, this mass corresponds to one of the medium size asteroids in the asteroid belt, roughly 80km in diameter. Considering that measuring the effect of such an object would be near impossible, and the DM is spread over the entire solar system, the chance of any kind of detection event is still nil.


[1]: http://arxiv.org/abs/0907.0018

[nicksauce]

Yeah you're right, I don't know why I had 1kg in my mind. 10^18 kg is the number I get after a quick calculation.

[richerrich]

Don't know about that, but it is small.

Using the value from [1] for a density of 0.39 GeV/cm^3 and a characteristic solar system scale of about 100AU, I get a total energy ~ 10^35 J, or dividing by c^2, ~10^18 kg. At any rate, this mass corresponds to one of the medium size asteroids in the asteroid belt, roughly 80km in diameter. Considering that measuring the effect of such an object would be near impossible, and the DM is spread over the entire solar system, the chance of any kind of detection event is still nil.


[1]: http://arxiv.org/abs/0907.0018

Thank you very much Nabeshin.