Abstract
Although the linear massive spin-2 theory is not restored to general relativity (GR) even in a massless limit, Vainshtein proposed the discontinuity can be resolved by taking into account nonlinear interactions. We consider whether the nonlinear ghost-free bigravity theory can be restored to GR both in the cosmological background and in the strong gravitational field based on a spherically symmetric configuration. In the cosmological background, the scalar graviton is stabilized by nonlinear interactions in the early stage of the Universe, thus the bigravity has the GR limit with neither a ghost instability nor a gradient instability. On the other hand, the bigravity cannot describe a static compact object beyond a critical value of gravitational field strength for a parameter space of coupling constants, at which the scalar graviton shows a singular behaviour.
| Original language | English |
|---|---|
| Title of host publication | 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings |
| Editors | Remo Ruffini, Massimo Bianchi, Remo Ruffini, Robert T Jantzen |
| Publisher | World Scientific Publishing Co. Pte Ltd |
| Pages | 1493-1498 |
| Number of pages | 6 |
| ISBN (Electronic) | 9789813226593 |
| Publication status | Published - 2018 Jan 1 |
| Event | 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Rome, Italy Duration: 2015 Jul 12 → 2015 Jul 18 |
Other
| Other | 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories |
|---|---|
| Country | Italy |
| City | Rome |
| Period | 15/7/12 → 15/7/18 |
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Keywords
- Modified gravity
- Screening mechanism
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Astronomy and Astrophysics
Cite this
Cosmological and astrophysical Vainshtein mechanism in bigravity. / Aoki, Katsuki; Maeda, Keiichi; Tanabe, Makoto; Namba, Ryo.
14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings. ed. / Remo Ruffini; Massimo Bianchi; Remo Ruffini; Robert T Jantzen. World Scientific Publishing Co. Pte Ltd, 2018. p. 1493-1498.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Cosmological and astrophysical Vainshtein mechanism in bigravity
AU - Aoki, Katsuki
AU - Maeda, Keiichi
AU - Tanabe, Makoto
AU - Namba, Ryo
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Although the linear massive spin-2 theory is not restored to general relativity (GR) even in a massless limit, Vainshtein proposed the discontinuity can be resolved by taking into account nonlinear interactions. We consider whether the nonlinear ghost-free bigravity theory can be restored to GR both in the cosmological background and in the strong gravitational field based on a spherically symmetric configuration. In the cosmological background, the scalar graviton is stabilized by nonlinear interactions in the early stage of the Universe, thus the bigravity has the GR limit with neither a ghost instability nor a gradient instability. On the other hand, the bigravity cannot describe a static compact object beyond a critical value of gravitational field strength for a parameter space of coupling constants, at which the scalar graviton shows a singular behaviour.
AB - Although the linear massive spin-2 theory is not restored to general relativity (GR) even in a massless limit, Vainshtein proposed the discontinuity can be resolved by taking into account nonlinear interactions. We consider whether the nonlinear ghost-free bigravity theory can be restored to GR both in the cosmological background and in the strong gravitational field based on a spherically symmetric configuration. In the cosmological background, the scalar graviton is stabilized by nonlinear interactions in the early stage of the Universe, thus the bigravity has the GR limit with neither a ghost instability nor a gradient instability. On the other hand, the bigravity cannot describe a static compact object beyond a critical value of gravitational field strength for a parameter space of coupling constants, at which the scalar graviton shows a singular behaviour.
KW - Modified gravity
KW - Screening mechanism
UR - http://www.scopus.com/inward/record.url?scp=85059051419&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85059051419&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85059051419
SP - 1493
EP - 1498
BT - 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
A2 - Ruffini, Remo
A2 - Bianchi, Massimo
A2 - Ruffini, Remo
A2 - Jantzen, Robert T
PB - World Scientific Publishing Co. Pte Ltd
ER -