On the non-Gaussian correlation of the primordial curvature perturbation with vector fields

Дата и время публикации : 2012-10-12T09:52:50Z

Авторы публикации и институты :
Rajeev Kumar Jain
Martin S. Sloth

Ссылка на журнал-издание: JCAP 1302 (2013) 003
Коментарии к cтатье: 18 pages. V3: some typos fixed, matches version published in JCAP
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO, hep-ph, hep-th

Краткий обзор статьи: We compute the three-point cross-correlation function of the primordial curvature perturbation generated during inflation with two powers of a vector field in a model where conformal invariance is broken by a direct coupling of the vector field with the inflaton. If the vector field is identified with the electromagnetic field, this correlation would be a non-Gaussian signature of primordial magnetic fields generated during inflation. We find that the signal is maximized for the flattened configuration where the wave number of the curvature perturbation is twice that of the vector field and in this limit, the magnetic non-linear parameter becomes as large as |b_{NL}| ~ 10^3. In the squeezed limit where the wave number of the curvature perturbation vanishes, our results agree with the magnetic consistency relation derived in arXiv:1207.4187.

Category: Physics