WIMPs (Weakly Interacting Massive Particles)
Theoretical physics · Supersymmetry models (1970s-1980s) (1980)
WIMPs are hypothetical particles that are heavy, move at non-relativistic speeds, and interact only via the weak nuclear force and gravity, making them a prime dark matter candidate. They are predicted by many extensions of the Standard Model, such as supersymmetry, and would have been thermally produced in the early universe.
Core Concepts
The Problem
The Standard Model of particle physics does not provide a viable dark matter candidate, and an extension is needed.
The Claim
Dark matter consists of WIMPs, which can be detected through their rare interactions with ordinary matter.
Key Evidence
- •The thermal relic abundance calculation naturally produces a dark matter density close to observed values (the 'WIMp miracle').
- •Multiple direct and indirect detection experiments are searching for WIMp signatures.
- •WIMPs provide a consistent story linking particle physics and cosmology.
Practical Implication
Detection of WIMPs would unify particle physics and cosmology, confirming a major prediction of theories beyond the Standard Model.
Nuance & Limits
Despite decades of search, no definitive WIMp signal has been found. Null results at experiments like XENON and LHC constrain WIMp parameter space, prompting consideration of other candidates (axions, sterile neutrinos) or non-particle dark matter.
Source Material
Citation Density
Extensive
Gaps
- ⚠ No direct detection to date.
- ⚠ Sstring limits from LHC and underground experiments challenge simplest supersymmetry models.
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