Higher order statistics of curvature perturbations in<i>IFF</i>model and its Planck constraints

Fujita, Tomohiro; Yokoyama, Shuichiro

doi:10.1088/1475-7516/2013/09/009

Cited by 65 publications

(93 citation statements)

References 73 publications

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“…To the best of our knowledge, no magnetogenesis mechanism which consistently produces strong and large-scale helical magnetic fields has been established [42][43][44][45][46][47][48][49]. For instance, the natural inflation model or its relatives naturally generate the helical magnetic field by introducing a coupling between the U(1) gauge field and the axion [53,57,58], but the produced magnetic field is too weak to satisfy the observational lower bound in a minimum setup.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…An analytical expression for the attractor behavior are also given there. The quantitative results 2 To the best of our knowledge, no mechanism is known to be able to produce magnetic fields which satisfy the observational lower bound, still less our scenario [42][43][44][45][46][47][48][49]. Therefore it is challenging and intriguing open question how the magnetic field are generated, while we do not explore it in this paper.…”

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confidence: 96%

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Large-scale magnetic fields can explain the baryon asymmetry of the Universe

2016

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Helical hypermagnetic fields in the primordial Universe can produce the observed amount of baryon asymmetry through the chiral anomaly without any ingredients beyond the Standard Model of particle physics. While they generate no B − L asymmetry, the generated baryon asymmetry survives the spharelon washout effect, because the generating process remains active until the electroweak phase transition. Solving the Boltzmann equation numerically and finding an attractor solution, we show that the baryon asymmetry of our Universe can be explained, if the present largescale magnetic fields indicated by the blazar observations have a negative helicity and existed in the early Universe before the electroweak phase transition. We also derive the upper bound on the strength of the helical magnetic field, which is tighter than the CMB constraint, to avoid the overproduction of baryon asymmetry.

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Section: Summary and Discussionmentioning

confidence: 99%

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confidence: 96%

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

2016

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“…Once these couplings are introduced during inflation, the time variation of kinetic function can amplify the quanta of the form field on superhorizon scales. Among these couplings, the particle production of U(1) gauge field has been motivated to explain the presence of intergalactic magnetic field [4][5][6][7][8][9][10][11][12][13][14]. Furthermore, some models of inflation have been investigated in the framework of anisotropic inflation, where the inflaton is kinetically coupled to U(1) gauge field or two-form field [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

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confidence: 99%

Footprint of two-form field: Statistical anisotropy in primordial gravitational waves

Obata

Fujita

2019

Phys. Rev. D

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We study the observational signatures of two-form field in the inflationary cosmology. In our setup a two-form field is kinetically coupled to a spectator scalar field and generates sizable gravitational waves and smaller curvature perturbation. We find that the sourced gravitational waves have a distinct signature: they are always statistically anisotropic and their spherical moments are non-zero for hexadecapole and tetrahexacontapole, while the quadrupole moment vanishes. Since their amplitude can reach O(10 −3 ) in the tensor-toscalar ratio, we expect this novel prediction will be tested in the next generation of the CMB experiments. I. INTRODUCTIONThe inflationary scenario elegantly explains the anisotropy of cosmic microwave background radiation (CMB) and the seed of the large scale structure in our universe. On top of them, it quantum-mechanically generates the fluctuations of spacetime, namely primordial gravitational waves, and imprints the B-mode polarization pattern in the CMB map. The detection of the primordial B-mode polarization originating from the inflationary universe is therefore one of the most important targets in cosmology. Its amplitude is parameterized by tensor-to-scalar ratio r and recent joint collaboration of Planck and BICEP2/Keck array have constrained its amount as r < ∼ 0.07 [1]. In the next decades, the sensitivity will increase up to r ∼ 10 −3 by the appearance of LiteBIRD [2] and CMB-S4 [3]. The energy scale probed by CMB observations is around the scale of grand unification theory 10 16 GeV, and thus we have a chance to obtain indispensable clues to develop the high energy physics such as GUT, supergravity or superstring through the detection

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“…(125), we assumed, as in Ref. [143], that H , , and ρ inf are constant during inflation, and that p inf ρ inf . Equation (126), instead, comes from Eqs.…”

Section: Scalar Curvature Perturbationmentioning

confidence: 99%

“…Other types of configurations are possible, such as the equilateral and the orthogonal. They are, however, inessential for our discussion since a scaling-invariant electromagnetic field produces (under appropriate approximations [143]) only local-type shapes for the bispectrum and trispectrum.…”

Section: Scalar Curvature Perturbationmentioning

confidence: 99%

Lorentz-violating inflationary magnetogenesis

Campanelli

2015

Eur. Phys. J. C

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A non-conformally invariant coupling between the inflaton and the photon in the minimal Lorentz-violating standard model extension is analyzed. For specific forms of the Lorentz-violating background tensor, the strongcoupling and back-reaction problems of magnetogenesis in de Sitter inflation with scale ∼10 16 GeV are evaded, the electromagnetic-induced primordial spectra of (Gaussian and non-Gaussian) scalar and tensor curvature perturbations are compatible with cosmic microwave background observations, and the inflation-produced magnetic field directly accounts for cosmic magnetic fields.

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Higher order statistics of curvature perturbations inIFFmodel and its Planck constraints

Cited by 65 publications

References 73 publications

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

Footprint of two-form field: Statistical anisotropy in primordial gravitational waves

Lorentz-violating inflationary magnetogenesis

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