Properties of Oscillons in Hilltop Potentials: energies, shapes, and lifetimes

Antusch, Stefan and Cefala, Francesco and Torrenti, Francisco. (2019) Properties of Oscillons in Hilltop Potentials: energies, shapes, and lifetimes. Journal of Cosmology and Astroparticle Physics (JCAP), 1910 (10). 002.

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Official URL: https://edoc.unibas.ch/73585/

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Oscillons are spatially localised strong fluctuations of a scalar field. They can e.g. form after inflation when the scalar field potential is shallower than quadratic away from the minimum. Although oscillons are not protected by topology, they can be remarkably stable and have a significant impact on the (p)reheating phase. In this work we investigate the properties of oscillons in hilltop-shaped potentials, in particular the typical energies, shapes and lifetimes. In the first part of the paper, we simulate oscillon creation and stabilization with (3+1)-dimensional classical lattice simulations, and extract the typical energies, radii and amplitudes of the oscillons. In the second part we approximate the oscillons as spherically symmetric, and simulate single oscillons until their decay. We find that typical oscillons live up to about 10(4)-10(5) field oscillations, with the individual lifetime of the oscillons depending mainly on the initial shape of the oscillon and the power-law coefficient characterising the particular hilltop model. We also observe a breathing mode in the oscillon radii and amplitudes, and find that stronger breathing implies shorter lifetimes.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Antusch)
UniBasel Contributors:Antusch, Stefan and CefalĂ , Francesco and Torrenti, Francisco
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:15 Apr 2020 15:13
Deposited On:15 Apr 2020 15:13

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