I know how a torus planet can form.. magic... technology and magic collide on the torus planet... Hmmm can we say Fred Saberhagen...

According to the calculations by the authors of the paper linked to in the OP, it could form. The work is copyright protected so I can only direct readers to page 687 in Summary and Discussion that gives the conditions for formation.

 

Toroidal figures of equilibrium. Wong, C.-Y. Astrophysical Journal, Vol. 190, p. 675 - 694

Are they discussing the formation of a toroidal planet? Or toroidal condition of a galaxy?

 

I think the formation and stability of a planet sized toroid can be ruled out mathematically, for reasons already stated, without exotic material...with it (exotic material), it is no more difficult to fathom than a donut.

how about a giant 3D printer using pure information to built it, plank length string by string...the I-printer, the child of the laser 3D printer

Edited June 6, 201411 yr by hoola

[Acme] Are they discussing the formation of a toroidal planet? Or toroidal condition of a galaxy?

 

I think the formation and stability of a planet sized toroid can be ruled out mathematically, for reasons already stated, without exotic material...with it (exotic material), it is no more difficult to fathom than a donut.

They are talking primarily about planet sized torroids as far as stability, but I recall comments that a torroidal formation may extend to galaxies at certain stages but the torroid shape would likely break up into a bead formation and the beads becoming stars and seeding the arms. This is also an early possibility for a planet size torroid, but those details on the contraints on mass, material, etcetera are spelled out in the body of the paper. That body is the collection of the mathematical rules that show it is possible to have a torroidal space body form.

 

I could be wrong on some of those details as I only skim read through the entire paper once. If you find something specific you think is wrong in the paper itself and/or the calculations in it then feel free to point it out for us to have a look. Otherwise just saying I think this because of that is trumped by actual calculations.