Is Galilean Creation a Viable Alternative to Inflationary Cosmology?

[Chronos]

Galilean creation is one of a number of proposed alternatives to inflationary cosmology. This paper; http://arxiv.org/abs/1504.05710, Galilean Creation of the Inflationary Universe, takes the idea a step further by showing how it can transit smoothly to the single field inflationary model favored by WMAP and Planck.

 

[Drakkith]

Got a decent link explaining the basics of Galilean Creation? The paper is just a tad beyond my understanding.

 

[Chronos]

See http://arxiv.org/abs/1007.0027, Galilean Genesis: an alternative to inflation.

 

[Chalnoth]

See http://arxiv.org/abs/1007.0027, Galilean Genesis: an alternative to inflation.

Hmm. Apparently this model requires superluminal excitations. That makes it seem rather unlikely.

 

[rootone]

Galilieo was probably trying to explain things in a manner which would not irritate the inquisitors too much.

 

[Chalnoth]

Galilieo was probably trying to explain things in a manner which would not irritate the inquisitors too much.

This is a different idea. It's a recent alternative to inflation that relies upon a big rip-like scenario.

 

[Chronos]

Superluminal excitations are discussed, but, not deemed unavoidable under the Galilean Genesis model.

 

[Chalnoth]

Superluminal excitations are discussed, but, not deemed unavoidable under the Galilean Genesis model.

Sounded like they were pretty unavoidable to me. If you read the last paragraph in their conclusion, they basically say, "Well, maybe they can be avoided. We don't know how, but maybe."

 

[Chronos]

I agree, if the superluminal issue cannot be resolved, the model is suspect. Later papers appear promising on this count.

 

[davidp123]

That's a nice idea, except that it had been suggested and studied thoroughly 6 months earlier in

http://inspirehep.net/record/1320024

(this model does not lead to superluminal propagation)