Built on

C. Deffayet, S. Deser and G. Esposito-Farese, “Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress-tensors,” Phys. Rev. D
Original
1967
Earlier work this paper cites.
S. R. Coleman and E. J. Weinberg, “Radiative Corrections as the Origin of Spontaneous Symmetry Breaking,” Phys. Rev. D
1973
Earlier work this paper cites.
S. W. Hawking, “The Chronology protection conjecture,” Phys. Rev. D
1992
Earlier work this paper cites.
J. Garriga and V. F. Mukhanov, “Perturbations in k-inflation,” Phys. Lett. B
1999
Earlier work this paper cites.
M. Visser, B. Bassett and S. Liberati, “Superluminal censorship,” Nucl. Phys. Proc. Suppl
2000
Earlier work this paper cites.
M. A. Luty, M. Porrati and R. Rattazzi, “Strong interactions and stability in the DGP model,” JHEP
2003
Earlier work this paper cites.
S. M. Carroll, M. Hoffman and M. Trodden, “Can the dark energy equation - of - state parameter w be less than -1?,” Phys. Rev. D
2003
Earlier work this paper cites.
N. Arkani-Hamed, H. C. Cheng, M. A. Luty and S. Mukohyama, “Ghost condensation and a consistent infrared modification of gravity,” JHEP
2004
Earlier work this paper cites.
A. Nicolis and R. Rattazzi, “Classical and quantum consistency of the DGP model,” JHEP
2004
Earlier work this paper cites.
J. M. Cline, S. Jeon and G. D. Moore, “The Phantom menaced: Constraints on low-energy effective ghosts,” Phys. Rev. D
2004
Earlier work this paper cites.
A. Adams, N. Arkani-Hamed, S. Dubovsky, A. Nicolis and R. Rattazzi, “Causality, analyticity and an IR obstruction to UV completion,” JHEP
2006
Earlier work this paper cites.
S. Dubovsky, T. Gregoire, A. Nicolis and R. Rattazzi, “Null energy condition and superluminal propagation,” JHEP
2006
Earlier work this paper cites.

Similar

P. Creminelli, M. A. Luty, A. Nicolis and L. Senatore, “Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies,” JHEP
2006
Cited alongside, same era.
A. Nicolis, R. Rattazzi and E. Trincherini, “The Galileon as a local modification of gravity,” Phys. Rev. D
Original
2009
Cited alongside, same era.
C. Deffayet, G. Esposito-Farese and A. Vikman, “Covariant Galileon,” Phys. Rev. D
Original
2009
Cited alongside, same era.
V. A. Rubakov, “Harrison-Zeldovich spectrum from conformal invariance,” JCAP
Original
2009
Cited alongside, same era.
E. Dyer and K. Hinterbichler, “Boundary Terms and Junction Conditions for the DGP pi-Lagrangian,” JHEP
Original

Then

L. Levasseur Perreault, R. Brandenberger and A. -C. Davis, “Defrosting in an Emergent Galileon Cosmology,” Phys. Rev. D
Original
2011
Later among the works it cites.
J. Khoury, J. -L. Lehners and B. A. Ovrut, “Supersymmetric Galileons,” Phys. Rev. D
Original
2011
Later among the works it cites.
G. Goon, K. Hinterbichler and M. Trodden, “Symmetries for Galileons and DBI scalars on curved space,” JCAP
Original
2011
Later among the works it cites.
G. Goon, K. Hinterbichler and M. Trodden, “A New Class of Effective Field Theories from Embedded Branes,” Phys. Rev. Lett
Original
2011
Later among the works it cites.
P. Creminelli, G. D’Amico, M. Musso, J. Norena and E. Trincherini, “Galilean symmetry in the effective theory of inflation: new shapes of non-Gaussianity,” JCAP

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2012

Subluminal Galilean Genesis

Creminelli, Paolo, Hinterbichler, Kurt, Khoury, Justin et al.

Understand

We put forward an improved version of the Galilean Genesis model that addresses the problem of superluminality.

We demote the full conformal group to Poincare symmetry plus dilations, supplemented with approximate galilean shift invariance in the UV and at small field values.
In this way fluctuations around the NEC-violating cosmological background are made substantially subluminal, and superluminality cannot be reached by any small change of the solution, in contrast with the original model.
Dilation invariance still protects the scale-invariance of correlation functions of a massless test scalar - which is the source of the observed cosmological fluctuations - but the explicit breaking of the conformal group can be potentially observed in higher-order correlators.

Built on

C. Deffayet, S. Deser and G. Esposito-Farese, “Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress-tensors,” Phys. Rev. D
Original
1967
Earlier work this paper cites.
S. R. Coleman and E. J. Weinberg, “Radiative Corrections as the Origin of Spontaneous Symmetry Breaking,” Phys. Rev. D
1973
Earlier work this paper cites.
S. W. Hawking, “The Chronology protection conjecture,” Phys. Rev. D
1992
Earlier work this paper cites.
J. Garriga and V. F. Mukhanov, “Perturbations in k-inflation,” Phys. Lett. B
1999
Earlier work this paper cites.
M. Visser, B. Bassett and S. Liberati, “Superluminal censorship,” Nucl. Phys. Proc. Suppl
2000
Earlier work this paper cites.
M. A. Luty, M. Porrati and R. Rattazzi, “Strong interactions and stability in the DGP model,” JHEP
2003
Earlier work this paper cites.
S. M. Carroll, M. Hoffman and M. Trodden, “Can the dark energy equation - of - state parameter w be less than -1?,” Phys. Rev. D
2003
Earlier work this paper cites.
N. Arkani-Hamed, H. C. Cheng, M. A. Luty and S. Mukohyama, “Ghost condensation and a consistent infrared modification of gravity,” JHEP
2004
Earlier work this paper cites.
A. Nicolis and R. Rattazzi, “Classical and quantum consistency of the DGP model,” JHEP
2004
Earlier work this paper cites.
J. M. Cline, S. Jeon and G. D. Moore, “The Phantom menaced: Constraints on low-energy effective ghosts,” Phys. Rev. D
2004
Earlier work this paper cites.
A. Adams, N. Arkani-Hamed, S. Dubovsky, A. Nicolis and R. Rattazzi, “Causality, analyticity and an IR obstruction to UV completion,” JHEP
2006
Earlier work this paper cites.
S. Dubovsky, T. Gregoire, A. Nicolis and R. Rattazzi, “Null energy condition and superluminal propagation,” JHEP
2006
Earlier work this paper cites.