#
waynehu

## Professor,
Department of Astronomy and Astrophysics

University of Chicago

# Fast WMAP Likelihood Code and GSR PC Functions

##
Cora Dvorkin & Wayne Hu

Optimized WMAP7 likelihood code for multicore systems: OMPed loops
and bottlenecks removed in the following codes:

Speed improvements apply to the Gibbs low-*l* TT likelihood, Master TT/TE/EE
likelihood

Supplies an approximate replacement for the low-*l* polarization pixel
likelihood based on a 2 band EE approach

- Utilizes the "use_lowl_pol = .false." flag to replace
*l*<24 with this approach

See Dvorkin & Hu (2010) for speed and accuracy tests. After first evaluation
typical improvement in speed is ~5xNcore

5 principal component (PC) functions of the GSR source function for determining the PC amplitudes of a model. [eta(Mpc), S1, ... S5]

### References

[1] ''CMB Constraints on Principal Components of the Inflaton Potential,'' Dvorkin & Hu (2010) PRD, 82, 043513, 1007.0215