The anisotropy of a three- and a one-form [PDF]
Federico R UrbanWe calculate the anisotropic signal associated with the coupling of a three-form with an Abelian vector gauge field. In the simplest examples of three-form inflation the amplification of the vector fluctuations is exponential; this makes it almost certain that a large anisotropy will develop, severely constraining the viability of the coupling.View original: http://arxiv.org/abs/1306.6429
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