Publisher’s Note: Cosmic microwave background bispectrum of vector modes induced from primordial magnetic fields [Phys. Rev. D82, 121302(R) (2010)]
نویسندگان
چکیده
منابع مشابه
Cosmic microwave background bispectrum from primordial magnetic fields on large angular scales.
Primordial magnetic fields lead to non-Gaussian signals in the cosmic microwave background (CMB) even at the lowest order, as magnetic stresses and the temperature anisotropy they induce depend quadratically on the magnetic field. In contrast, CMB non-Gaussianity due to inflationary scalar perturbations arises only as a higher-order effect. We propose a novel probe of stochastic primordial magn...
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Measurement of the CMB bispectrum, or three-point correlation function, has now become one of the principle efforts in early-Universe cosmology. Here we show that there is an odd-parity component of the CMB bispectrum that has been hitherto unexplored. We argue that odd-parity temperature-polarization bispectra can arise, in principle, through weak lensing of the CMB by chiral gravitational wav...
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We derive an expression for the non-Gaussian cosmic-microwave-background (CMB) statistic I3 l defined recently by Ferreira, Magueijo, and Górski in terms of the slow-roll-inflation parameters ǫ and η. This result shows that a nonzero value of I3 l in COBE would rule out single-field slow-roll inflation. A sharp change in the slope of the inflaton potential could increase the predicted value of ...
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We derive an expression for the non-Gaussian cosmic microwave background ~CMB! statistic I l 3 defined recently by Ferreira, Magueijo, and Górski in terms of the slow-roll-inflation parameters e and h . This result shows that a nonzero value of I l 3 in COBE would rule out single-field slow-roll inflation. A sharp change in the slope of the inflaton potential could increase the predicted value ...
متن کاملCosmic microwave background polarization signals from tangled magnetic fields.
Tangled, primordial cosmic magnetic fields create small rotational velocity perturbations on the last scattering surface of the cosmic microwave background radiation. For fields which redshift to a present value of B0 = 3 x 10(-9) G, these vector modes are shown to generate polarization anisotropies of order 0.1-4 microK on small angular scales (500<l<2000), assuming delta function or a power l...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2011
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.83.029901