A quartic self-coupling around 10^-90 can allow 10^-22 eV scalar dark matter to match galaxy rotation curves and the soliton-halo relation, softening bounds derived for non-interacting ULDM.
Self-interactions of ULDM to the r escue?,
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Self-interactions of ultralight spinless dark matter to the rescue?
A quartic self-coupling around 10^-90 can allow 10^-22 eV scalar dark matter to match galaxy rotation curves and the soliton-halo relation, softening bounds derived for non-interacting ULDM.