Journal
PHYSICAL REVIEW D
Volume 88, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.88.023528
Keywords
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Funding
- European Research Council via the Starting [256994]
- DOE [DE-AC02-76-ER-03071]
- NSF [1001296]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1001296] Funding Source: National Science Foundation
- European Research Council (ERC) [256994] Funding Source: European Research Council (ERC)
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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.
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