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- W2028383413 abstract "Detecting the parity-odd, or B-mode, polarization pattern in the cosmic microwave background radiation due to primordial gravity waves is considered to be the final observational key to confirming the inflationary paradigm. The search for viable models of inflation from particle physics and string theory has (re)discovered another source for B-modes: cosmic strings. Strings naturally generate as much vector-mode perturbation as they do scalar, producing B-mode polarization with a spectrum distinct from that expected from inflation itself. In a large set of models, B-modes arising from cosmic strings are more prominent than those expected from primordial gravity waves. In light of this, we study the physical underpinnings of string-sourced B-modes and the model dependence of the amplitude and shape of the ${C}_{l}^{mathrm{BB}}$ power spectrum. Observational detection of a string-sourced B-mode spectrum would be a direct probe of post-inflationary physics near the grand unified theory (GUT) scale. Conversely, nondetection would put an upper limit on a possible cosmic string tension of $Gensuremath{mu}ensuremath{lesssim}{10}^{ensuremath{-}7}$ within the next three years." @default.
- W2028383413 created "2016-06-24" @default.
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- W2028383413 date "2008-04-15" @default.
- W2028383413 modified "2023-09-24" @default.
- W2028383413 title "B-modes from cosmic strings" @default.
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- W2028383413 doi "https://doi.org/10.1103/physrevd.77.083509" @default.
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