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Updated: Jun 8, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Ultralight Dark Matter from the Edge of Field Space
Mathias Becker1,2, Francesco D'Eramo1,2, Ville Vaskonen1,2,3
1Università degli Studi di Padova, Dipartimento di Fisica e Astronomia, Via Marzolo 8, 35131 Padova, Italy.
None:
We introduce a novel class of bosonic dark matter candidates that we dub wallions, featuring boundaries in field space. The wallion mass is exponentially suppressed when the separation between boundaries far exceeds their intrinsic width and remains radiatively stable under self-interactions. We study the early universe evolution of wallions and the associated cosmological signatures. Finally, we show that instanton effects can dynamically generate field-space boundaries and discuss possible experimental probes once the wallion couples to standard model fields.
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