منابع مشابه
Natural Magnetogenesis from Inflation
We consider the gravitational generation of the massive Z boson field of the standard model, due to the natural breaking of its conformal invariance during inflation. The electroweak symmetry restoration at the end of inflation turns the almost scale-invariant superhorizon Z spectrum into a hypermagnetic field, which transforms into a regular magnetic field at the electroweak phase transition. ...
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The primordial density fluctuation inevitably couples to all forms of matter via loop corrections and depends on the ambient conditions while inflation was ongoing. This gives us an opportunity to observe processes which were in progress while the universe was inflating, provided they were sufficiently dramatic to overcome suppression by powers of (H/MP) 2 ≈ 10, where H is the Hubble scale duri...
متن کاملMagnetogenesis, Variation of Gauge Couplings and Inflation
The interplay among the possible variation of gauge coupling and the inflationary dynamics is investigated in a simplified toy model. Depending upon various parameters (scalar mass, curvature scale at the end of inflation and at the onset of the radiation epoch), the two-point function of the magnetic inhomogeneities grows during the de Sitter stage of expansion and, consequently, large scale m...
متن کاملMagnetogenesis and the dynamics of internal dimensions
The dynamical evolution of internal space-like dimensions breaks the invariance of the Maxwell’s equations under Weyl rescaling of the (conformally flat) four-dimensional metric. Depending upon the number and upon the dynamics of internal dimensions large scale magnetic fields can be created. The requirements coming from magnetogenesis together with the other cosmological constraints are examin...
متن کاملInflationary magnetogenesis from dynamical gauge couplings
The evolution of the gauge coupling is modelled using a scalar degree of freedom whose homogeneous and inhomogeneous modes evolve from an ordinary inflationary phase to the subsequent epochs. Depending upon various parameters (scalar mass, curvature scale at the end of inflation and at the onset of the radiation epoch), the two-point function of the magnetic inhomogeneities grows during the de ...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2018
ISSN: 0264-9381,1361-6382
DOI: 10.1088/1361-6382/aae2d6