81 research outputs found
Efficient decomposition of cosmic microwave background polarization maps into pure E, pure B, and ambiguous components
Separation of the B component of a cosmic microwave background (CMB)
polarization map from the much larger E component is an essential step in CMB
polarimetry. For a map with incomplete sky coverage, this separation is
necessarily hampered by the presence of "ambiguous" modes which could be either
E or B modes. I present an efficient pixel-space algorithm for removing the
ambiguous modes and separating the map into "pure" E and B components. The
method, which works for arbitrary geometries, does not involve generating a
complete basis of such modes and scales the cube of the number of pixels on the
boundary of the map.Comment: Minor changes to previous version. Accepted for publication in Phys.
Rev.
The COBE Normalization of CMB Anisotropies
With the advent of the COBE detection of fluctuations in the Cosmic Microwave
Background radiation, the study of inhomogeneous cosmology has entered a new
phase. It is now possible to accurately normalize fluctuations on the largest
observable scales, in the linear regime. In this paper we present a
model-independent method of normalizing theories to the full COBE data. This
technique allows an extremely wide range of theories to be accurately
normalized to COBE in a very simple and fast way. We give the best fitting
normalization and relative peak likelihoods for a range of spectral shapes, and
discuss the normalization for several popular theories. Additionally we present
both Bayesian and frequentist measures of the goodness of fit of a
representative range of theories to the COBE data.Comment: References updated, one figure redraw
The Meaning of Einstein's Equation
This is a brief introduction to general relativity, designed for both
students and teachers of the subject. While there are many excellent
expositions of general relativity, few adequately explain the geometrical
meaning of the basic equation of the theory: Einstein's equation. Here we give
a simple formulation of this equation in terms of the motion of freely falling
test particles. We also sketch some of its consequences, and explain how the
formulation given here is equivalent to the usual one in terms of tensors.
Finally, we include an annotated bibliography of books, articles and websites
suitable for the student of relativity.Comment: 23 pages LaTeX, 8 encapsulated Postscript figures; unlike the
published version this includes a derivation of the inverse-square force la
The Wiener-Filtered COBE DMR Data and Predictions for the Tenerife Experiment
We apply a Wiener filter to the two-year COBE DMR data. The resulting sky map
has significantly reduced noise levels compared to the raw data: the most
prominent hot and cold spots are significant at the 4-sigma level. Furthermore,
the entire covariance matrix of the errors in the filtered sky map is known,
and it is therefore possible to make constrained realizations of the microwave
sky with the correct a posteriori probability distribution. The filtered DMR
sky map is used to make predictions for the Tenerife experiment. Two prominent
features are predicted in a region of the sky not yet analyzed by the Tenerife
group. The presence of these features is a robust prediction of the standard
cosmological paradigm; if these features are not observed, some of our
fundamental assumptions must be incorrect.Comment: 15 pages of uuencoded compressed PostScript. A PostScript file
including figures is available at ftp://pac2.berkeley.edu/pub/bunn/wienerten
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