Horndeski gravity in the swampland
We investigate the implications of string swampland criteria for alternative theories of gravity. Even though this has not rigorously been proven, there is some evidence that exact de Sitter solutions with a positive cosmological constant cannot be successfully embedded into string theory, and that...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
12 June 2019
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| In: |
Physical review
Year: 2019, Jahrgang: 99, Heft: 12, Pages: 124020-1 - 124020-8 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.99.124020 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1103/PhysRevD.99.124020 Verlag: https://link.aps.org/doi/10.1103/PhysRevD.99.124020 
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| Verfasserangaben: | Lavinia Heisenberg, Matthias Bartelmann, Robert Brandenberger, and Alexandre Refregier |
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| 520 | |a We investigate the implications of string swampland criteria for alternative theories of gravity. Even though this has not rigorously been proven, there is some evidence that exact de Sitter solutions with a positive cosmological constant cannot be successfully embedded into string theory, and that the low energy effective field theories containing a scalar field π with a potential V in the habitable landscape should satisfy the swampland criteria |V′|/V≥c∼O(1). As a paradigmatic class of modified gravity theories for inflation and dark energy, we consider the extensively studied family of Horndeski Lagrangians in view of cosmological observations. Apart from a possible potential term, they contain derivative self-interactions as the Galileon and nonminimal couplings to the gravity sector. Hence, our conclusions on the Galileon sector can be also applied to many other alternative theories with scalar helicity modes containing derivative interactions such as massive gravity and generalized Proca. In the presence of such derivative terms, the dynamics of the scalar mode is substantially modified, and imposing the cosmological evolution constrained by observations places tight constraints on c within the swampland conjecture | ||
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