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- W2605051567 abstract "In this work we study the imprints of a primordial cosmic string on inflationary power spectrum. Cosmic string induces two distinct contributions on curvature perturbations power spectrum. The first type of correction respects the translation invariance while violating isotropy. This generates quadrupolar statistical anisotropy in CMB maps which is constrained by the Planck data. The second contribution breaks both homogeneity and isotropy, generating a dipolar power asymmetry in variance of temperature fluctuations with its amplitude falling on small scales. We show that the strongest constraint on the tension of string is obtained from the quadrupolar anisotropy and argue that the mass scale of underlying theory responsible for the formation of string can not be much higher than the GUT scale. The predictions of string for the diagonal and off-diagonal components of CMB angular power spectrum are presented." @default.
- W2605051567 created "2017-04-14" @default.
- W2605051567 creator A5066342538 @default.
- W2605051567 creator A5067464427 @default.
- W2605051567 creator A5076144852 @default.
- W2605051567 date "2017-07-13" @default.
- W2605051567 modified "2023-09-27" @default.
- W2605051567 title "Primordial anisotropies from cosmic strings during inflation" @default.
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- W2605051567 doi "https://doi.org/10.1103/physrevd.96.023512" @default.