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How long does it take to get dark matter in black ops 4? 

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The freeze-in mechanism of dark matter production provides a simple and intriguing alternative to the WIMP paradigm.
Within this framework, many new models for multi-component dark matter can be implemented.
This result may depend on the particular way the dark matter is built-in into the model.
This result is particularly relevant in constraining dark matter frameworks with gamma-ray data.
Although an application of the approach presented here would likely be feasible with current experiments only for very optimistic dark matter scenarios, the improved sensitivity of upcoming experiments could enable this technique to be used to study a wider range of dark matter models.

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