Built on

B. Bellazzini, M. Lewandowski, and J. Serra, “Amplitudes’ Positivity, Weak Gravity Conjecture, and Modified Gravity,”
Original
1902
Earlier work this paper cites.
S. Hirano, T. Kobayashi, and D. Yamauchi, “Screening mechanism in degenerate higher-order scalar-tensor theories evading gravitational wave constraints,”
Original
1903
Earlier work this paper cites.
M. Crisostomi, M. Lewandowski, and F. Vernizzi, “Vainshtein regime in Scalar-Tensor gravity: constraints on DHOST theories,”
Original
1903
Earlier work this paper cites.
P. Creminelli, G. Tambalo, F. Vernizzi, and V. Yingcharoenrat, “Resonant Decay of Gravitational Waves into Dark Energy,”
Original
1906
Earlier work this paper cites.
N. Frusciante and L. Perenon, “Effective Field Theory of Dark Energy: a Review,”
Original
1907
Earlier work this paper cites.
J. Gleyzes, D. Langlois, F. Piazza, and F. Vernizzi, “Exploring gravitational theories beyond Horndeski,”
Original
1952
Earlier work this paper cites.
C. Armendariz-Picon, V. F. Mukhanov, and P. J. Steinhardt, “A Dynamical solution to the problem of a small cosmological constant and late time cosmic acceleration,”
2000
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C. Armendariz-Picon, V. F. Mukhanov, and P. J. Steinhardt, “Essentials of k essence,”
2001
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M. A. Luty, M. Porrati, and R. Rattazzi, “Strong interactions and stability in the DGP model,”
2003
Earlier work this paper cites.
J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,”
2003
Earlier work this paper cites.
A. Nicolis and R. Rattazzi, “Classical and quantum consistency of the DGP model,”
2004
Earlier work this paper cites.
P. Creminelli, M. A. Luty, A. Nicolis, and L. Senatore, “Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies,”
2006
Earlier work this paper cites.
S. Dubovsky, T. Gregoire, A. Nicolis, and R. Rattazzi, “Null energy condition and superluminal propagation,”
2006
Earlier work this paper cites.
Oxford Master Series in Physics. Oxford University Press, 2007
M. Maggiore, · 2007
Earlier work this paper cites.
C. Cheung, P. Creminelli, A. L. Fitzpatrick, J. Kaplan, and L. Senatore, “The Effective Field Theory of Inflation,”
Original
2008
Earlier work this paper cites.

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A. Joyce, B. Jain, J. Khoury, and M. Trodden, “Beyond the Cosmological Standard Model,”
Original
2015
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D. Langlois and K. Noui, “Degenerate higher derivative theories beyond Horndeski: evading the Ostrogradski instability,”
Original
2016
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M. Crisostomi, K. Koyama, and G. Tasinato, “Extended Scalar-Tensor Theories of Gravity,”
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D. Pirtskhalava, L. Santoni, E. Trincherini, and F. Vernizzi, “Large Non-Gaussianity in Slow-Roll Inflation,”
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2019

Dark-Energy Instabilities induced by Gravitational Waves

Creminelli, Paolo, Tambalo, Giovanni, Vernizzi, Filippo et al.

Understand

We point out that dark-energy perturbations may become unstable in the presence of a gravitational wave of sufficiently large amplitude.

We study this effect for the cubic Horndeski operator (braiding), proportional to $\alpha_{\rm B}$.
The scalar that describes dark-energy fluctuations features ghost and/or gradient instabilities for gravitational-wave amplitudes that are produced by typical binary systems.
Taking into account the populations of binary systems, we conclude that the instability is triggered in the whole Universe for $|\alpha_{\rm B} |\gtrsim 10^{-2}$, i.e.

Built on

B. Bellazzini, M. Lewandowski, and J. Serra, “Amplitudes’ Positivity, Weak Gravity Conjecture, and Modified Gravity,”
Original
1902
Earlier work this paper cites.
S. Hirano, T. Kobayashi, and D. Yamauchi, “Screening mechanism in degenerate higher-order scalar-tensor theories evading gravitational wave constraints,”
Original
1903
Earlier work this paper cites.
M. Crisostomi, M. Lewandowski, and F. Vernizzi, “Vainshtein regime in Scalar-Tensor gravity: constraints on DHOST theories,”
Original
1903
Earlier work this paper cites.
P. Creminelli, G. Tambalo, F. Vernizzi, and V. Yingcharoenrat, “Resonant Decay of Gravitational Waves into Dark Energy,”
Original
1906
Earlier work this paper cites.
N. Frusciante and L. Perenon, “Effective Field Theory of Dark Energy: a Review,”
Original
1907
Earlier work this paper cites.
J. Gleyzes, D. Langlois, F. Piazza, and F. Vernizzi, “Exploring gravitational theories beyond Horndeski,”
Original
1952
Earlier work this paper cites.
C. Armendariz-Picon, V. F. Mukhanov, and P. J. Steinhardt, “A Dynamical solution to the problem of a small cosmological constant and late time cosmic acceleration,”
2000
Earlier work this paper cites.
C. Armendariz-Picon, V. F. Mukhanov, and P. J. Steinhardt, “Essentials of k essence,”
2001
Earlier work this paper cites.
M. A. Luty, M. Porrati, and R. Rattazzi, “Strong interactions and stability in the DGP model,”
2003
Earlier work this paper cites.
J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,”
2003
Earlier work this paper cites.
A. Nicolis and R. Rattazzi, “Classical and quantum consistency of the DGP model,”
2004
Earlier work this paper cites.
P. Creminelli, M. A. Luty, A. Nicolis, and L. Senatore, “Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies,”
2006
Earlier work this paper cites.
S. Dubovsky, T. Gregoire, A. Nicolis, and R. Rattazzi, “Null energy condition and superluminal propagation,”
2006
Earlier work this paper cites.
Oxford Master Series in Physics. Oxford University Press, 2007
M. Maggiore, · 2007
Earlier work this paper cites.
C. Cheung, P. Creminelli, A. L. Fitzpatrick, J. Kaplan, and L. Senatore, “The Effective Field Theory of Inflation,”
Original
2008
Earlier work this paper cites.