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2016

Where does curvaton reside? Differences between bulk and brane frames

Larrouturou, François, Mukohyama, Shinji, Namba, Ryo et al.

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Some classes of inflationary models naturally introduce two distinct metrics/frames, and their equivalence in terms of observables has often been put in question.

D-brane inflation proposes candidates for an inflaton embedded in the string theory and possesses descriptions on the brane and bulk metrics/frames, which are connected by a conformal/disformal transformation that depends on the inflaton and its derivatives.
It has been shown that curvature perturbations generated by the inflaton are identical in both frames, meaning that observables such as the spectrum of cosmic microwave background (CMB) anisotropies are independent of whether matter fields---including those in the standard model of particle physics---minimally couple to the brane or the bulk metric/frame.
This is true despite the fact that the observables are eventually measured by the matter fields and that the total action including the matter fields is different in the two cases.

Where does curvaton reside? Differences between bulk and brane frames · Around

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