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Repulsive Dark Matter
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It seems necessary to suppress, at least partially, the formation of structure on subgalactic scales. As an alternative to warm or collisional dark matter, I postulate a condensate of massive bosons interacting via a repulsive interparticle potential, plus gravity. This leads to a minimum lengthscale for bound objects, and to superfluidity. Galactic dynamics may differ significantly from that of more generic dark matter in not unwelcome ways, especially in the core. Such particles can be realized as quanta of a relativistic massive scalar field with a quartic self-interaction. At high densities, the equation of state has the same form as that of an ideal relativistic gas despite the interactions. If the nonrelativistic lengthscale is of order a kiloparsec, then the energy density in these particles was comparable to that of photons at early times, but small enough to avoid conflict with primordial nucleosynthesis.
Forward citations
Cited by 6 Pith papers
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A No-Go Theorem for the Mass-Radius Relation of Solitons
A no-go theorem excludes Gamma in [0,d] for typical non-topological non-relativistic spherically symmetric solitons, with the same exclusion for barotropic fluid compact objects, ruling out natural soliton explanation...
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Coherence and Quantum Stability of Relativistic Superfluid States
A charged scalar condensate is quantum-stable to all perturbative orders when it is described by the interacting vacuum of fluctuations, a non-Gaussian dressed coherent state that is an eigenstate of H minus mu Q.
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Vortex-reconnection energy bounds in Bose-Einstein-condensed and superfluid dark matter halos
Vortex reconnections in BEC/superfluid dark matter halos produce dark-sector heating at a rate that is secular but sub-virial for relaxed non-interacting soliton cores, with the dominant uncertainty being the true vor...
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Dark Matter-Independent Orbital Decay Bounds on Ultralight Bosons from OJ287
OJ287 orbital timing excludes ultralight scalar bosons with masses around 0.85 to 2.2 x 10^-21 eV through superradiance-cloud dynamical friction, independent of dark matter assumptions.
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Cosmological simulations of the same spiral galaxy: satellite properties, the role of baryonic physics and star formation history in shaping dark matter cores/cusps
Satellites that form most of their stars early keep dark matter cusps, while late or continuous star formers develop oscillating cores, so the dwarf diversity problem may be explained by feedback history and tides wit...
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Risk-based framework to determine climate-informed design storms for road drainage infrastructure
A risk-index method combining climate projections, physiographic hazard, and socioeconomic vulnerability scales future design storms for Ontario road drainage.
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