Supersymmetric Cubic Galileons Have Ghosts
arXiv:1302.0840 · doi:10.1103/PhysRevD.88.023528
Abstract
Galileons are higher-derivative theories of a real scalar which nevertheless admit second order equations of motion. They have interesting applications as dark energy models and in early universe cosmology, and have been conjectured to arise as descriptions of brane dynamics in string theory. In the present paper, we study the bosonic sector of globally N=1 supersymmetric extensions of the cubic Galileon Lagrangian in detail. Supersymmetry requires that the Galileon scalar now becomes paired with a second real scalar field. We prove that the presence of this second scalar causes the equations of motion to become higher than second order, thus leading to the appearance of ghosts. We also analyze the energy scales up to which, in an effective field theory description, the ghosts can be tamed.
18 pages, v4: discussion updated in light of arXiv:1306.2961 by Farakos et al
References in corpus (16)
- Towards a Nonsingular Bouncing Cosmology
- New Ekpyrotic Cosmology
- Galilean Genesis: an alternative to inflation
- Galileon Cosmology
- DBI and the Galileon reunited
- Multi-field galileons and higher co-dimension branes
- Symmetries for Galileons and DBI scalars on curved space
- Non-Gaussianities in New Ekpyrotic Cosmology
- Bi-galileon theory I: motivation and formulation
- Higher-Derivative Chiral Superfield Actions Coupled to N=1 Supergravity
- DBI Genesis: An Improved Violation of the Null Energy Condition
- On the Initial Conditions in New Ekpyrotic Cosmology
- The Ghost Condensate in N=1 Supergravity
- Eternal Inflation With Non-Inflationary Pocket Universes
- Goldstone's Theorem and Hamiltonian of Multi-galileon Modified Gravity
- DBI Inflation in N=1 Supergravity
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- On the Supersymmetrization of Galileon Theories in Four Dimensions
- Non-Canonical Inflation in Supergravity
- On supersymmetric gauge theories with higher derivatives and nonlocal terms in the matter sector
- Supersymmetric Massive Gravity
- Supersymmetric galileons and auxiliary fields in 2+1 dimensions
- Fermionic Shift Symmetries in (Anti) de Sitter Space
- Contractions of AdS brane algebra and superGalileon Lagrangians
- On the strong coupling scale in Higgs G-inflation
- Conformal couplings of Galileons to other degrees of freedom
- Simple Models in Supersymmetric Quantum Mechanics on a Graph