|Apr10-12, 02:24 AM||#18|
Why doesn't light interact with dark matter?
Dark matter DOES interact with photons. In post # 7 of this thread I wrote “Of course light DOES interact with dark matter! Gravitational lensing is the most convincing evidence.”
In post # 8 Nabeshin remarked that “dark matter interacts gravitationally”
In my post #9 I reaffirmed the fact that Dark Matter does indeed interact with photons (light rays).
In post #10 Drakkith took issue with that statement.
In post #11 I elaborated, defined terms, made a statement of scientific fact, and concluded: “Therefore: Light interacts with dark matter.”
In post #12 Drakkith corrected his statement and wrote “Sorry, I meant "Doesn't interact with dark matter, other than gravity, at all.”
In post #15 Nabeshin, referencing my conclusion that dark matter interacts with light in post #11, agreed with my conclusion when he wrote “Eh, this is fine. I just don't want the OP to be confused and think dark matter couples to the electromagnetic force, that's all.”
If this is mistaken, will you please correct it with evidence to the contrary?
If it is accurate, will you please revise your post so as to clearly describe this natural process?
Thank you, Bobbywhy
|Apr10-12, 07:11 AM||#19|
Photons do not interact with anything during gravitational lensing. They follow the geodesics in curved space-time caused by the presence of matter/energy, and we interpret it as their deflection from the original path. But no event of absorption, and re-emission, whether its elastic or inelastic, of a photon took place during such a process. The gravitational interaction is not incorporated in the current scheme of interactions (the Standard Model), simply because it is not treated as a true force, but as a classical theory whose effect looks as a pseudoforce.
|Apr10-12, 12:05 PM||#20|
Bobby, everyone understands what is meant by "doesn't interact with". There is no reason to get bent out of shape.
|Apr10-12, 02:16 PM||#21|
Yes, of course dark matter has a gravitational affect - how would we otherwise suspect its existence? Technicaly speaking, dark matter is thought to be weakly interactive [emphasis on weakly]. Detection of dark matter annihilations is an active area of research, although evidence to date suggests it is a rare occurence.
|Apr12-12, 10:10 PM||#22|
|dark matter, light|
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