Creation of wormholes by quantum tunnelling in modified gravity theories

Battarra, Lorenzo; Lavrelashvili, George V.; Lehners, Jean-Luc

doi:10.1103/PhysRevD.90.124015

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Creation of wormholes by quantum tunnelling in modified gravity theories

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Lavrelashvili, George V.
Quantum Gravity and Unified Theories, AEI Golm, MPI for Gravitational Physics, Max Planck Society;

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Lehners, Jean-Luc
String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Zitation

Battarra, L., Lavrelashvili, G. V., & Lehners, J.-L. (2014). Creation of wormholes by quantum tunnelling in modified gravity theories. Physical Review D, 90: 124015. doi:10.1103/PhysRevD.90.124015.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0024-7671-5

Zusammenfassung

We study the process of quantum tunnelling in scalar-tensor theories in which the scalar field is non-minimally coupled to gravity. In these theories gravitational instantons can deviate substantially from sphericity and can in fact develop a neck - a feature prohibited in theories with minimal coupling. Such instantons with necks lead to the materialisation of bubble geometries containing a wormhole region. We clarify the relationship of neck geometries to violations of the null energy condition, and also derive a bound on the size of the neck relative to that of the instanton.