Please use this identifier to cite or link to this item:
https://www.um.edu.mt/library/oar/handle/123456789/89177
Title: | Well-tempered Minkowski solutions in teleparallel Horndeski theory |
Authors: | Bernardo, Reginald Christian Said, Jackson Caruana, Maria Appleby, Stephen |
Keywords: | Astronomy -- Observations Gravitation Observations, Astronomical Cosmology Quantum field theory |
Issue Date: | 2021 |
Publisher: | IOP Publishing Ltd |
Citation: | Bernardo, R. C., Said, J. L., Caruana, M., & Appleby, S. (2021). Well-tempered Minkowski solutions in teleparallel Horndeski theory. Classical and Quantum Gravity, 39(1), 015013. |
Abstract: | Well-tempering stands among the few classical methods of screening vacuum energy to deliver a late-time, low energy vacuum state. We build on the class of Horndeski models that admit a Minkowski vacuum state despite the presence of an arbitrarily large vacuum energy to obtain a much larger family of models in teleparallel Horndeski theory. We set up the routine for obtaining these models and present a variety of cases, all of which are able to screen a natural particle physics scale vacuum energy using degeneracy in the field equations. We establish that well-tempering is the unique method of utilizing degeneracy in Horndeski scalar-tensor gravity—and its teleparallel generalisation—that can accommodate self-tuned flat Minkowski solutions, when the explicit scalar field dependence in the action is minimal (a tadpole and a conformal coupling to the Ricci scalar). Finally, we study the dynamics of the well-tempered teleparallel Galileon. We generate its phase portraits and assess the attractor nature of the Minkowski vacuum under linear perturbations and through a phase transition of vacuum energy. |
URI: | https://www.um.edu.mt/library/oar/handle/123456789/89177 |
Appears in Collections: | Scholarly Works - InsSSA |
Files in This Item:
File | Description | Size | Format | |
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Well-tempered Minkowski solutions in teleparallel Horndeski theory.pdf Restricted Access | 1.83 MB | Adobe PDF | View/Open Request a copy | |
2108.02500.pdf | ArXiv ePrint | 1.12 MB | Adobe PDF | View/Open |
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