Introduction E9F5FC

Questions FFFFC0

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What I will try to do (or others might do) is to focus on collisions of hydrogen and antihydrogen. In the sparsest region of space

• What is the density?
• What is the average velocity?
• What is the average energy of the particles?
• What are the gamma rays produced?

Imagine a plane midway between our sun and Alpha Centauri which separates them, that is, which is normal to the geodesic connecting them. In that plane,

• How many collisions would be occuring per square meter per second?
• How much energy would that generate in a square light year per second?
• What would that look like to us?

{$v_{rms}=\sqrt{\left \langle v^2 \right \rangle}$}

{$E_{R}=\frac{1}{2}{v_{rms}^2}=\frac{3}{2}kT$}

{$k=8.6\times 10^{-5}eV\cdot K^{-1}=10^{-4}\frac{eV}{K}$}

Readings

• Wikipedia: Interstellar medium