Luke

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	location	London
	age	23
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	seen	May 22 at 2:29
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student

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6 Questions

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4	What's the physical difference between the quantities $\langle v_{i}v_{j}\rangle$ and $\langle v_{i}\rangle\langle v_{j}\rangle$?
4	Can dark matter be relativistic dust?
2	What happens if an atom absorbs a photon of energy higher than first excited state but lower than second excited state? [duplicate]
1	Relation between multipole moment and angular scale of CMB
0	Vector cross product of $\mathbf{r}$ and $\ddot{\mathbf{r}}$ in polar coordinates

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68 Reputation

+20	What's the physical difference between the quantities $\langle v_{i}v_{j}\rangle$ and $\langle v_{i}\rangle\langle v_{j}\rangle$?
+20	Can dark matter be relativistic dust?
+5	Relation between multipole moment and angular scale of CMB
+5	What happens if an atom absorbs a photon of energy higher than first excited state but lower than second excited state?

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1 Answer

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0	What is the process that gives mass to free relativitic particles?

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0 cosmology × 3	0 quantum-mechanics
0 homework × 2	0 velocity
0 special-relativity × 2	0 statistics
0 higgs-mechanism	0 orbital-motion
0 particle-physics	0 newtonian-mechanics

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