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Violation of the Rotational Invariance in the CMB Bispectrum
Violation Rotational Invariance CMB Bispectrum
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2011/9/27
We investigate a statistical anisotropy on the Cosmic Microwave Background (CMB) bispectrum which can be generated from the primordial non-Gaussianity induced by quantum fluctuations of a vector field...
Conformal invariance of curvature perturbation
Conformal invariance curvature perturbation
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2011/10/18
We show that in the single component situation all perturbation variables in the comoving gauge are conformally invariant to all perturbation orders. Generally we identify a special time slicing, the ...
f(T) gravity and local Lorentz invariance
f(T) gravity local Lorentz invariance
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2011/1/13
We show that in theories of generalised teleparallel gravity, whose Lagrangians are algebraic functions of the usual teleparallel Lagrangian, the action and the field equations are not invariant unde...
Particle Production of Vector Fields: Scale Invariance is Attractive
Particle Production of Vector Fields Scale Invariance
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2010/11/16
In a model of an Abelian vector boson with a Maxwell kinetic term and non-negative mass-squared
it is demonstrated that, under fairly general conditions, a scale-invariant spectrum of perturbations f...