Abstract
We investigate structure formation for ultra-light scalar field dark matter coupled to quintessence, in particular the cosmon–bolon system. The linear power spectrum is computed by a numerical solution of the coupled field equations. We infer the substructure abundance within a Milky Way-like halo. Estimates of dark halo abundances from recent galaxy surveys imply a lower bound on the bolon mass of about 9×10−22 eV. This seems to exclude a possible detection of scalar field dark matter through time variation in pulsar timing signals in the near future.
Highlights
We investigate structure formation for ultralight scalar field dark matter coupled to quintessence, in particular the cosmon-bolon system
In the ΛCDM scenario the dark sector consists of a pressureless fluid modeling cold dark matter and a cosmological constant making up dark energy
We have presented an analysis of structure formation in the cosmon-bolon scenario of scalar field dark matter coupled to quintessence
Summary
Most notable are probably the apparent predicted overabundance of dwarf galaxies in the Milky way galaxy (the missing satellite problem [7, 8]) and the cusp-like density profiles of halos which could be inconsistent with observed velocity dispersions both in galaxies (the cusp-core problem [9, 10]) and dwarf-galaxies (the too big to fail problem [11,12,13]) While some of these issues, in particular the missing satellite problem, might just be a result of our lack of understanding of the baryonic physics of galaxy formation [14,15,16,17], they may still be a hint towards possible modifications of dark sector physics. It provides for a natural explanation of a possible coupling between dark energy and dark matter (”coupled quintessence” [5, 29]) which is often postulated somewhat ad hoc
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