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arXiv · 2111.12136

Dark Energy from Inspiraling in Field Space

Lilia Anguelova·John Dumancic·Richard Gass·L. C. R. Wijewardhana
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Abstract

We find an exact solution of the equations of motion of a two-field cosmological model, which realizes multi-field dark energy. The latter is characterized by field-space trajectories with turning rates that are always large. We study a class of two-field models and show that it is possible to have such trajectories, giving accelerated space-time expansion, even when the scalar potential preserves the rotational invariance of the field-space metric. For the case of Poincaré-disk field space, we derive the form of the scalar potential compatible with such background solutions and, furthermore, we find the exact solutions analytically. Their field-space trajectories are spirals inward, toward the center of the Poincaré disk. Interestingly, the functional form of the relevant scalar potential is compatible with a certain hidden symmetry, although the latter is broken by the presence of a constant term.

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Lilia Anguelova, John Dumancic, Richard Gass, L. C. R. Wijewardhana. 2022-02-07. Dark Energy from Inspiraling in Field Space. https://doi.org/10.1088/1475-7516%2F2022%2F03%2F018

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