N-flationary magnetic fields

Anber, Mohamed M.; Sorbo, Lorenzo

doi:10.1088/1475-7516/2006/10/018

Cited by 251 publications

(332 citation statements)

References 38 publications

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“…More details on this bound on the generation of PBHs are reported in Sec. 5. models shown in this section are in agreement 30 with the constraints set by Planck on n s and r and on the generation of primordial non-Gaussianities. 31 Interestingly, for none of the models shown in this plot the spectrum features a peak.…”

Section: An Example: Attractor Modelssupporting

confidence: 83%

“…(ii) they appear abundantly in supergravity as part of complex scalars as well as in string theory [27], where they typically arise upon compactification of form field gauge potentials. (iii) they generically couple to the topological Chern-Simons term of any gauge group, leading to a wide range of potentially observable effects [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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PBH dark matter from axion inflation

Domcke

Muia

Pieroni

et al. 2017

J. Cosmol. Astropart. Phys.

110

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Protected by an approximate shift symmetry, axions are well motivated candidates for driving cosmic inflation. Their generic coupling to the Chern-Simons term of any gauge theory gives rise to a wide range of potentially observable signatures, including equilateral non-Gaussianites in the CMB, chiral gravitational waves in the range of direct gravitational wave detectors and primordial black holes (PBHs). In this paper we revisit these predictions for axion inflation models non-minimally coupled to gravity.Contrary to the case of minimally coupled models which typically predict scale-invariant mass distributions for the generated PBHs at small scales, we demonstrate how broadly peaked PBH spectra naturally arises in this setup. For specific parameter values, all of dark matter can be accounted for by PBHs.Dedicated to the memory of Pierre Binétruy

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Section: An Example: Attractor Modelssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

PBH dark matter from axion inflation

Domcke

Muia

Pieroni

et al. 2017

J. Cosmol. Astropart. Phys.

110

View full text Add to dashboard Cite

show abstract

“…(See also Appendix B.) For example, maximally helical B-field can be generated by pseudo scalar inflation [21,22] and chiral instability [29,30] (see also Refs. [58,59]).…”

Section: Estimate Of Present Intergalactic Magnetic Fieldmentioning

confidence: 99%

“…There have been many proposals for primordial magnetogenesis, such as the inflationary magnetogenesis [19][20][21][22], productions from the first-order phase transition of the electroweak symmetry [23][24][25] or QCD [26][27][28], or productions through the chiral instability [29][30][31]. It remains to be seen if these proposals can match magnetic field spectra as indicated by the blazar observations (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 98%

Magnetic field transfer from a hidden sector

Kamada¹,

Tsai²,

Vachaspati³

2018

Phys. Rev. D

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Primordial magnetic fields in the dark sector can be transferred to magnetic fields in the visible sector due to a gauge kinetic mixing term. We show that the transfer occurs when the evolution of magnetic fields is dominated by dissipation due to finite electric conductivity, and does not occur at later times if the magnetic fields evolve according to magnetohydrodynamics scaling laws. The efficiency of the transfer is suppressed by not only the gauge kinetic mixing coupling but also the ratio between the large electric conductivity and the typical momentum of the magnetic fields. We find that the transfer gives nonzero visible magnetic fields today. However, without possible dynamo amplifications, the field transfer is not efficient enough to obtain the intergalactic magnetic fields suggested by the gamma-ray observations, although there are plenty of possibilities for efficient dark magnetogenesis, which are experimentally unconstrained.

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“…Many authors have used gauge fields in cosmology -for inflation as well as for late-time behavior [18][19][20][21][22][23][24][25][26][27][28][29]. A common issue is that spin-1 fields have a preferred direction and therefore break isotropy.…”

Section: Background Modelmentioning

confidence: 99%

Cosmological consequences of classical flavor-space locked gauge field radiation

Bielefeld

Caldwell

2015

Phys. Rev. D

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We propose a classical SU(2) gauge field in a flavor-space locked configuration as a species of radiation in the early universe, and show that it would have a significant imprint on a primordial stochastic gravitational wave spectrum. In the flavor-space locked configuration, the electric and magnetic fields of each flavor are parallel and mutually orthogonal to other flavors, with isotropic and homogeneous stress-energy. Due to the non-Abelian coupling, the gauge field breaks the symmetry between left-and right-circularly polarized gravitational waves. This broken chiral symmetry results in a unique signal: non-zero cross correlation of the cosmic microwave background temperature and polarization, T B and EB, both of which should be zero in the standard, chiral symmetric case. We forecast the ability of current and future CMB experiments to constrain this model. Furthermore, a wide range of behavior is shown to emerge, depending on the gauge field coupling, abundance, and allocation into electric and magnetic field energy density. The fluctuation power of primordial gravitational waves oscillates back and forth into fluctuations of the gauge field. In certain cases, the gravitational wave spectrum is shown to be suppressed or amplified by up to an order of magnitude depending on the initial conditions of the gauge field.

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N-flationary magnetic fields

Cited by 251 publications

References 38 publications

PBH dark matter from axion inflation

PBH dark matter from axion inflation

Magnetic field transfer from a hidden sector

Cosmological consequences of classical flavor-space locked gauge field radiation

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