Tasks

Things we need for a nice paper

• Star plot on the Planck legacy showing how the values of each coupling alter the ns/r.
• Compute the running of the spectral index.
• Possible transition to polychord (?)
• Possible transition to MS integration (?)
• Figure out the theory... expect to spend most of project thinking about this.
• Weyl anomaly (talk to Carlo Marzo)

Example of variational derivative in xAct (let's say you have metric G, covariant derivative CD, and indices a, b):

Expr=<some scalar-valued expression in xAct>
Expr//Print;
Expr//=VarD[G[a,b],CD];
Expr//Print;

Carefully check by testing some examples whether the factor of Sqrt[-Det[G]] is assumed in the result.

WB

• Get PCS set up on Newton.
• Maybe try to parallelize the optimizer.
• Think about Hertzberg argument.

PCS

• Delete all useless files, try to consolidate scripts as much as possible, have meaningful file names.
• Get the optimizer working in parallel, spend no more than 1-2 days getting it fast.
• If still you have problems, let WB have a go.
• Learn about ssh (within Windows).
• Recompute the JP current analysis in xAct, then extend to our model.