Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Microwave Background Bispectrum from the Lensing--Rees-Sciama
  Correlation Reexamined: Effects of Non-linear Matter Clustering   The bispectrum of the cosmic microwave background (CMB) generated by a
correlation between a time-dependent gravitational potential and the weak
gravitational lensing effect provides a direct measurement of the influence of
dark energy on CMB. This bispectrum is also known to yield the most important
contamination of the so-called "local-form" primordial bispectrum, which can be
used to rule out all single-field inflation models. In this paper, we reexamine
the effect of non-linear matter clustering on this bispectrum. We compare three
different approaches: the 3rd-order perturbation theory (3PT), and two
empirical fitting formulae available in the literature, finding that detailed
modeling of non-linearity appears to be not very important, as most of the
signal-to-noise comes from the squeezed triangle, for which the correlation in
the linear regime dominates. The expected signal-to-noise ratio for an
experiment dominated by the cosmic variance up to $l_{\rm max}=1500$ is about
5, which is much smaller than the previous estimates including non-linearity,
but agrees with the estimates based on the linear calculation. We find that the
difference between the linear and non-linear predictions is undetectable, and
does not alter the contamination of the local-form primordial non-Gaussianity.

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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: math-ph