Multifield extension of inflation
Aug 22, 2013
10 pages
Published in:
- Phys.Rev.D 88 (2013) 8, 083504
- Published: Oct 8, 2013
e-Print:
- 1308.4798 [hep-th]
Report number:
- RUP-13-7,
- IPMU13-0158
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Citations per year
Abstract: (APS)
We propose a multifield extension of (generalized) G inflation, based on covariant multi-Galileons and their generalization preserving second-order field equations. We compute the quadratic action for cosmological perturbations. By comparing the formulas for cosmological perturbations, it is highlighted that multifield Dirac-Born-Infield Galileon inflation is not included in the multifield version of generalized G inflation. Our result indicates that the generalized covariant multi-Galileon theory is not the most general multi-scalar-tensor theory with second-order field equations.Note:
- 12 pages; v2: version accepted for publication in PRD
- 98.80.Cq
- inflation
- field equations
- perturbation
- covariance
- Galileon
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