Dark Matter Candidates Quiz: Test Your Knowledge Of Possibilities

Concept: high-density regions. Signals from annihilation/decay would be stronger where dark matter density is higher. Dense regions are natural targets.

Concept: gravity affects light. Lensing depends on mass, not brightness. So invisible mass can still distort the images of background galaxies.

Concept: testing ranges. Experiments scan possibilities by setting limits on interaction strength for different masses. This narrows down viable models.

Concept: complementary searches. Different detectors are sensitive to different masses or interaction types. Together, they provide broader coverage.

Concept: three-pronged approach. Scientists try to detect dark matter particles in labs, in space, and in particle collisions. Weather has nothing to do with it.

Concept: conservation and invisibility. Energy and momentum are conserved, so 'missing' means something carried them away. Weakly interacting particles are one possible cause.

Concept: model variety. There is no confirmed identity yet. Some models involve multiple components or new interactions.

Concept: signal-to-noise. Rare-event searches fail if backgrounds dominate. Reducing noise increases confidence if a signal appears.

Concept: constraints matter. Null results narrow down interaction strengths and masses. That guides future experiments and theory.

Concept: evidence vs identity. Gravity tells us 'something' is there, but not what it’s made of. Without clear non-gravitational signatures, multiple models can fit.

Concept: candidate meaning. We have strong evidence for unseen mass, but not its identity. Candidates are theoretical possibilities that could produce the observed effects.

Concept: direct detection. Experiments search for tiny energy deposits from dark matter hitting nuclei. Because interactions are rare, detectors must be very sensitive and well-shielded.

Concept: indirect signals. If dark matter can annihilate or decay, it may produce detectable particles or photons. Observatories then look for unusual excess signals.

Concept: wimp acronym. WIMPs interact weakly and are massive compared to many known particles. This could make them hard to detect but gravitationally important.

Concept: background reduction. Cosmic rays can mimic rare events. Underground shielding reduces those backgrounds, making faint signals easier to identify.

Concept: constraints vs disproof. Non-detections constrain what dark matter could be and how strongly it interacts. The gravitational evidence remains, but the particle identity is still open.

Concept: axions (intro). Axions are hypothetical particles proposed in particle physics and explored as dark matter candidates. Their properties differ strongly from WIMPs.

Concept: cross-checking constraints. A candidate must fit rotation curves, lensing, and cosmic structure. It must also avoid conflicting with lab and collider constraints.

Concept: rarity of interactions. Weak interactions imply low detection rates. Careful statistics and background control are essential.

Concept: high-energy photon searches. Gamma rays can be produced in energetic particle processes. Excess gamma rays from certain regions could hint at dark matter interactions.