Correlation of inflation-produced magnetic fields with scalar fluctuations

Caldwell, Robert R.; Motta, Leonardo; Kamionkowski, Marc

doi:10.1103/physrevd.84.123525

Cited by 61 publications

(129 citation statements)

References 60 publications

(84 reference statements)

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“…That is, backreaction is not a significant issue for this classically consistent model. While the abelian vector field coupling becomes large during inflation, this is not important for the phenomenological, effective classical model [1,11,12,32,34]. Instead, much like the case of the "standard" ΛCDM cosmological model, it is of great interest to try to find a more fundamental, quantummechanically consistent, model that can give rise to this classical, observationally-successful, inflationary magnetogenesis model.…”

Section: Inflation-generated Magnetic Fieldmentioning

confidence: 99%

Evolution of inflation-generated magnetic field through phase transitions

et al. 2012

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We study the evolution of an inflation-generated magnetic field, due to its coupling to fluid motions, during cosmological phase transitions. We find that the magnetic field stays almost unchanged on large scales, while on small scales the spectrum is modified in such a way that power at small scales becomes progressively suppressed. We also show that the magnetic field generates turbulent motions in the initially turbulence-free plasma. On large scales, the slope of the resulting kinetic energy spectrum is consistent with that of white noise.

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Section: Inflation-generated Magnetic Fieldmentioning

confidence: 99%

Evolution of inflation-generated magnetic field through phase transitions

et al. 2012

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“…Recently, Caldwell & Motta (2011) showed that if the conformal invariance of electromagnetism is broken during the inflation and thus produced the PMFs, these magnetic fields may be correlated with the primordial density perturbations. In our analysis we have made a separate case for such fields.…”

Section: Introductionmentioning

confidence: 99%

PROBING PRIMORDIAL MAGNETIC FIELDS USING Lyα CLOUDS

Pandey¹,

Sethi²

2012

ApJ

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From previous studies of the effect of primordial magnetic fields on early structure formation, we know that the presence of primordial magnetic fields during early structure formation could induce more perturbations at small scales (at present 1-10 h −1 Mpc) as compared to the usual ΛCDM theory. Matter power spectra over these scales are effectively probed by cosmological observables such as shear correlation and Lyα clouds. In this paper we discuss the implications of primordial magnetic fields on the distribution of Lyα clouds. We simulate the line-ofsight density fluctuation including the contribution coming from the primordial magnetic fields. We compute the evolution of Lyα opacity for this case and compare our theoretical estimates of Lyα opacity with the existing data to constrain the parameters of the primordial magnetic fields. We also discuss the case when the two density fields are correlated. Our analysis yields an upper bound of roughly 0.3-0.6 nG on the magnetic field strength for a range of nearly scale-invariant models, corresponding to a magnetic field power spectrum index n −3.

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“…Since our requirement that the field remains coherent on cosmological timescales is equivalent to setting k g H 0 , then an original coupling g ∼ O(1) can be engineered if a suitably large value of σ is permitted. An origin for this small coupling as well as the flavor-space locked configuration might be devised in an inflationary epoch along the lines of [34,35], although that is beyond the scope of our present investigation. Inflationary scenarios based on a similar gauge field that include self interactions with couplings to matter fields, have been studied elsewhere [36,37].…”

Section: Background Modelmentioning

confidence: 84%

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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Correlation of inflation-produced magnetic fields with scalar fluctuations

Cited by 61 publications

References 60 publications

Evolution of inflation-generated magnetic field through phase transitions

Evolution of inflation-generated magnetic field through phase transitions

PROBING PRIMORDIAL MAGNETIC FIELDS USING Lyα CLOUDS

Cosmological consequences of classical flavor-space locked gauge field radiation

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