Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherence and Sakharov Oscillations in the Microwave Sky   I discuss the origin of the ``Sakharov oscillations'' (or ``secondary Doppler
peaks'') in standard angular power spectra of the Cosmic Microwave Background
anisotropies calculated for inflationary models. I contrast this with the
production of CMB anisotropies in `active' models and argue that the presence
or absence of Sakharov oscillations will reveal fundamental properties of the
primordial perturbations.

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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci