CAMB: providing scale factor explicitly

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Álvaro DOMBRIZ
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Joined: February 09 2011
Affiliation: Cosmology and Gravitation group, Department of Mathematics and Applied Mathematics, U Cape Town
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CAMB: providing scale factor explicitly

Post by Álvaro DOMBRIZ » February 09 2011

Hi all,

I'm dealing with CAMB code and I was wondering if it is possible to provide the analytical expression of scale factor as a function of time (either conformal or cosmic) in the code explicitly.

The scale factor is usually "determined" in CAMB by integrating in time Friedmann equation as a first order differential equation. This fact is true for general relativity but not for a wide variety of modified gravities, so the standard method might not be very convenient.

Any ideas or comments are more than welcome

Regards

Álvaro Dombriz
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