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mersecske
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What is our best knowledge on the mass and spatial distribution of dark matter in our galaxy?
Could you give me a good reference?
Could you give me a good reference?
The interaction between dark matter particles must be predominantly gravitational. Dark matter does not participate in the electromagnetic interaction, but it might participate in the weak interaction.mersecske said:Do we know something about the forces between dark matter particles? Some restriction in some models?
Yes. As long as we still haven't detected the dark matter particle, its properties are fairly up in the air. But in any case the interactions must be pretty weak, whatever they are.mersecske said:Or it is possible to be an unknown interaction?
Dark matter is a type of matter that does not emit or absorb light, making it invisible to traditional telescopes. However, its presence can be inferred through its gravitational effects on visible matter. It is important to study its distribution in the Milky Way because it makes up about 85% of the total matter in the universe and plays a crucial role in the formation and evolution of galaxies.
Scientists use various techniques, such as gravitational lensing, rotation curves, and simulations, to map the distribution of dark matter in the Milky Way. Gravitational lensing occurs when the gravity of dark matter bends the path of light from distant galaxies, providing clues about its location and density. Rotation curves measure the speed of stars and gas in the galaxy, which can also reveal the presence of dark matter. Simulations use computer models to estimate the distribution of dark matter based on its gravitational effects.
Based on current research, scientists believe that dark matter is distributed in a spherical halo around the Milky Way's central disk. The density of dark matter is highest in the center of the galaxy and decreases as you move towards the outskirts. However, the exact distribution and density are still debated and continue to be studied.
The presence of dark matter significantly affects the dynamics of the Milky Way galaxy. Its gravitational pull helps hold the galaxy together and prevents stars and gas from escaping. It also plays a crucial role in the formation and evolution of structures within the galaxy, such as spiral arms and the central bulge.
Studying the distribution of dark matter in the Milky Way not only helps us understand the dynamics of our own galaxy, but it also has implications for our understanding of the universe as a whole. By studying the distribution of dark matter in different galaxies, we can gain insights into the large-scale structure and evolution of the universe. It may also provide clues about the nature of dark matter and its role in the formation and evolution of galaxies and the universe.