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Unitarity bounds and the cuspy halo problem.

¹Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027, USA. lhui@astro.columbia.edu

Physical Review Letters

|May 1, 2001

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Unitarity arguments constrain dark matter models. Efficient scattering in collisional and strongly annihilating dark matter models implies mass limits, with superelastic processes likely in collisional scenarios.

Area of Science:

Cosmology
Particle Physics
Astrophysics

Background:

Cold dark matter models predict dense central regions (cuspy halos) in galactic halos.
Observational data appears to contradict these predictions, indicating a need for alternative models.

Purpose of the Study:

To apply unitarity arguments to constrain two dark matter models: collisional dark matter and strongly annihilating dark matter.
To investigate the implications of these constraints for dark matter properties and search strategies.

Main Methods:

Utilized unitarity arguments from particle physics to derive constraints.
Analyzed scattering and annihilation processes within the proposed dark matter models.
Considered velocity-dependent cross-section scaling observed in recent evidence.

Related Experiment Videos

Main Results:

Derived upper mass limits for collisional dark matter (m ≤ 12 GeV) and strongly annihilating dark matter (m ≤ 25 GeV) based on efficient scattering.
Demonstrated that strong annihilation necessitates elastic scattering.
Argued for the involvement of superelastic processes in collisional dark matter scenarios with velocity-dependent cross-sections.

Conclusions:

Unitarity provides significant constraints on popular dark matter models.
The findings suggest specific mass ranges and interaction mechanisms that should be prioritized in dark matter searches.
Further investigation into superelastic scattering is warranted for collisional dark matter.