Magnetic reheating

Abstract

We provide a new bound on the amplitude of primordial magnetic fields (PMFs) by using a novel mechanism, named {\it magnetic reheating}. Before the epoch of recombination, PMFs induce the fluid motions in a photon-baryon plasma through the Lorentz force. Due to the viscosity in the plasma, such induced fluid motions would be damped and this means the dissipation of PMFs. In the early Universe with $z\gtrsim 2\times 10^6$, cosmic microwave background (CMB) photons are quickly thermalized with the dissipated energy and shift to a different Planck distribution with a new temperature. In other words, the energy injection due to the dissipation of PMFs changes the baryon-photon number ratio during this era and we name such a process {\it magnetic reheating}. By using the current results of the baryon-photon number ratio obtained from the Big Bang nucleosynthesis and CMB observations, we put a strongest constraint on the amplitude of PMFs on small scales which we can not access through CMB anisotropy and CMB distortions, $B_0\lesssim 1.0\mu \mathrm{G}$ at the scales $10^{4}h{\mathrm{Mpc}}^{-1}<k<10^{8}h{\mathrm{Mpc}}^{-1}$. Moreover, when the spectrum of PMFs is given by the power-law, the magnetic reheating puts a quite strong constraint in the case of the blue-tilted spectrum, for example, $B_0\lesssim 10^{-17}\mathrm{nG}$, $10^{-23}\mathrm{nG}$, and $10^{-29}\mathrm{nG}$ at 1~comoving Mpc for $n_B=1.0$, $2.0$, and $3.0$, respectively. This constraint would give an impact on generation mechanisms of PMFs in the early Universe.

5 pages, 2 figures, Published in MNRAS Letters

References in corpus (26)

• Planck 2013 results. XVI. Cosmological parameters
• The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set
• Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars
• Cosmological Magnetic Fields: Their Generation, Evolution and Observation
• The origin, evolution and signatures of primordial magnetic fields
• The evolution of CMB spectral distortions in the early Universe
• The intergalactic magnetic field constrained by Fermi/LAT observations of the TeV blazar 1ES 0229+200
• Damping of Cosmic Magnetic Fields
• Magnetohydrodynamics in the Early Universe and the Damping of Non-linear Alfven Waves
• Primordial Magnetic Fields and Causality
• Microwave Background Signatures of a Primordial Stochastic Magnetic Field
• The First Magnetic Fields
• Microwave Background Signals from Tangled Magnetic Fields
• A Limit on Primordial Small-Scale Magnetic Fields from CMB Distortions
• Planck 2015 results. XIX. Constraints on primordial magnetic fields
• Determination of intergalactic magnetic fields from gamma ray data
• Magnetic fields in the Large-Scale Structure of the Universe
• Massive Neutrinos and Magnetic Fields in the Early Universe
• BBN And The CMB Constrain Light, Electromagnetically Coupled WIMPs
• Evidence for GeV Pair Halos around Low Redshift Blazars
• Search for CP Violating Signature of Intergalactic Magnetic Helicity in the Gamma Ray Sky
• Constraining primordial magnetic fields with distortions of the black-body spectrum of the cosmic microwave background: pre- and post-decoupling contributions
• Reheating the Universe Once More: The Dissipation of Acoustic Waves as a Novel Probe of Primordial Inhomogeneities on Even Smaller Scales
• Updated constraint on a primordial magnetic field during big bang nucleosynthesis and a formulation of field effects
• Probing correlations of early magnetic fields using mu-distortion
• CMB distortion anisotropies due to the decay of primordial magnetic fields

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