暗物质

新论文介绍：原初黑洞作为粒子源，可以提供新的宇宙学探测手段。

An introduction about strong CP problem and its solutions. Readers are assumed to have basic knowledge of quantum field theory, but not more.

A type of models that can solve the strong CP problem, with large potential to explain the origin of matter-antimatter asymmetry and provide dark matter candidate.