### Abstract

In a recently proposed theory, the cosmological constant (CC) does not curve spacetime in our Universe, but instead gets absorbed into another universe endowed with its own dynamical metric, nonlocally coupled to ours. Thus, one achieves a long standing goal of removing entirely any cosmological constant from our Universe. Dark energy then cannot be due to a cosmological constant, but must be obtained via other mechanisms. Here we focus on the scenario in which dark energy is due to massive gravity and its extensions. We show how the metric of the other universe, that absorbs our CC, also gives rise to the fiducial metric known to be necessary for the diffeomorphism invariant formulation of massive gravity. This is achieved in a framework where the other universe is described by 5D AdS gravity, while our Universe lives on its boundary and is endowed with dynamical massive gravity. A nondynamical pullback of the bulk AdS metric acts as the fiducial metric for massive gravity on the boundary. This framework also removes a difficulty caused by the quantum strongly coupled behavior of massive gravity at the Λ3 scale: in the present approach, the massive gravity action does not receive any loop-induced counterterms, despite being strongly coupled.

Original language | English (US) |
---|---|

Article number | 104059 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 94 |

Issue number | 10 |

DOIs | |

State | Published - 2016 |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*94*(10), [104059]. https://doi.org/10.1103/PhysRevD.94.104059

**Metamorphosis of the cosmological constant and 5D origin of the fiducial metric.** / Gabadadze, Gregory; Yu, Siqing.

Research output: Contribution to journal › Article

*Physical Review D - Particles, Fields, Gravitation and Cosmology*, vol. 94, no. 10, 104059. https://doi.org/10.1103/PhysRevD.94.104059

}

TY - JOUR

T1 - Metamorphosis of the cosmological constant and 5D origin of the fiducial metric

AU - Gabadadze, Gregory

AU - Yu, Siqing

PY - 2016

Y1 - 2016

N2 - In a recently proposed theory, the cosmological constant (CC) does not curve spacetime in our Universe, but instead gets absorbed into another universe endowed with its own dynamical metric, nonlocally coupled to ours. Thus, one achieves a long standing goal of removing entirely any cosmological constant from our Universe. Dark energy then cannot be due to a cosmological constant, but must be obtained via other mechanisms. Here we focus on the scenario in which dark energy is due to massive gravity and its extensions. We show how the metric of the other universe, that absorbs our CC, also gives rise to the fiducial metric known to be necessary for the diffeomorphism invariant formulation of massive gravity. This is achieved in a framework where the other universe is described by 5D AdS gravity, while our Universe lives on its boundary and is endowed with dynamical massive gravity. A nondynamical pullback of the bulk AdS metric acts as the fiducial metric for massive gravity on the boundary. This framework also removes a difficulty caused by the quantum strongly coupled behavior of massive gravity at the Λ3 scale: in the present approach, the massive gravity action does not receive any loop-induced counterterms, despite being strongly coupled.

AB - In a recently proposed theory, the cosmological constant (CC) does not curve spacetime in our Universe, but instead gets absorbed into another universe endowed with its own dynamical metric, nonlocally coupled to ours. Thus, one achieves a long standing goal of removing entirely any cosmological constant from our Universe. Dark energy then cannot be due to a cosmological constant, but must be obtained via other mechanisms. Here we focus on the scenario in which dark energy is due to massive gravity and its extensions. We show how the metric of the other universe, that absorbs our CC, also gives rise to the fiducial metric known to be necessary for the diffeomorphism invariant formulation of massive gravity. This is achieved in a framework where the other universe is described by 5D AdS gravity, while our Universe lives on its boundary and is endowed with dynamical massive gravity. A nondynamical pullback of the bulk AdS metric acts as the fiducial metric for massive gravity on the boundary. This framework also removes a difficulty caused by the quantum strongly coupled behavior of massive gravity at the Λ3 scale: in the present approach, the massive gravity action does not receive any loop-induced counterterms, despite being strongly coupled.

UR - http://www.scopus.com/inward/record.url?scp=85000716836&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85000716836&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.94.104059

DO - 10.1103/PhysRevD.94.104059

M3 - Article

VL - 94

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 10

M1 - 104059

ER -