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| Paper IPM / Physic / 12152 |
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| Abstract: | |||||
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We revisit the idea of generating primordial anisotropies at the end of inflation in models where the
surface of end of inflation is controlled by a gauge field. To be specific we consider the charged hybrid
inflation model where the waterfall field is charged under a U (1) gauge field so the surface of end of
inflation is controlled both by inflation and the gauge field. Using Delta N formalism properly we find that
the anisotropies generated at the end of inflation from the gauge field fluctuations are exponentially
suppressed on cosmological scales. This is because the gauge field evolves exponentially during
inflation while in order to generate appreciable anisotropies at the end of inflation the spectator
gauge field has to be frozen and scale invariant. We argue that this is a generic feature, that is, one
can not generate observable anisotropies at the end of inflation within an FRW background.
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