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Zoology of instanton solutions in flat potential barriers

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons2689

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons16239

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

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Volltexte (frei zugänglich)

1307.7954.pdf
(Preprint), 5MB

PRD_88_104012.pdf
(beliebiger Volltext), 3MB

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Zitation

Battarra, L., Lavrelashvili, G. V., & Lehners, J.-L. (2013). Zoology of instanton solutions in flat potential barriers. Physical Review D, 88(10): 104012. doi:10.1103/PhysRevD.88.104012.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0014-3DB1-5
Zusammenfassung
We perform a detailed study of the existence and the properties of O(4)-invariant instanton solutions in Einstein-scalar theory in the presence of flat potential barriers, i.e. barriers where the second derivative of the potential is small at the top of the barrier. We find a whole zoo of solutions: Hawking-Moss, Coleman-De Luccia (CdL), oscillating instantons, asymmetric CdL as well as other non-standard CdL-like solutions with additional negative modes in their spectrum of fluctuations. Our work shows how these different branches of solutions are connected to each other via "critical" instantons possessing an extra zero mode fluctuation. Overall, the space of finite action euclidean solutions to these theories with flat barriers is surprisingly rich and intricate.