Thursday, May 8, 2014

Dynamic Simulation of the Universe

I noticed that the BBC ran an article this morning about a Dynamic Simulation of the Universe with Cold Dark Matter that was recently published in the journal Nature.

Galaxies
The simulation produces galaxies of different shapes and sizes that astronomers see in the real Universe

I think that simulations like this are fascinating and I encourage more people to run simulations like this.
However, I find it extremely odd that the researchers didn't state in the paper what was the mass of the dark matter particle in their simulations. They just mention Cold Dark Matter. It seems odd that the reviewers in a journal as well-recognized as Nature would have let this paper be published without requesting that the authors provide the mass of the Dark Matter particle.
If anybody knows what is the mass of the Dark Matter particle they used in their simulations, please comment on this post and provide us with the value of the rest mass of the Dark Matter particle.
Thank you

Also, to those people who work in this field, I have a request:
Try running a simulation in which the universe is simulated with all of the following properties: (1) a wrinkled surface on an expanding 4D sphere (i.e. General Relativity in 4D with non-isotropic mass density), (2) the radius of the 4D sphere expands only when there are time irreversible collisions (i.e. collisions involving the weak nuclear force are the cause of the expansion of space-time while GR tells how space-time is curved), and (3) the dark matter particle has a mass between 2-10 keV.

It seems to me that simulations that are missing (1), (2), and (3) above are missing major components required to actually simulate the evolution of the universe.

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