Cold and Hot Dark Matter

[kingwinner]

I will be writing my final exam tomorrow evening, and I am currently stuck on the following practice problem. It would be very nice if someone could help me out and I will remain eternally grateful for your help!

 

1) (Multiple Choice) Which of the following statement(s) about Cold Dark Matter (CDM) is (are) incorrect:

a) CDM particles travel at a speed much lower than c

:phones: neutrinos are a candidate for CDM

c) simulation models using CDM produce smaller scale structures than those using Hot Dark Matter

d) CDM is likely baryonic

e) CDM particles should be more massive than HOT Dark Matter particles

 

Well, I believe that a and e are true, b and d are false, but I am totally unsure about c...is it true or false and why? Does anyone know?

 

Thank you!

[sanctus]

The one I'm sure of is that :phones: is wrong, they used to be a candidate, but some calculations showed that even if they are massive they are not enough...

[kingwinner]

I am pretty sure that b is false as well...

 

But does anyone know whether c is true or false?

 

Thanks!

[Bob Eldritch]

I will be writing my final exam tomorrow evening, and I am currently stuck on the following practice problem. It would be very nice if someone could help me out and I will remain eternally grateful for your help!

 

1) (Multiple Choice) Which of the following statement(s) about Cold Dark Matter (CDM) is (are) incorrect:

a) CDM particles travel at a speed much lower than c

B) neutrinos are a candidate for CDM

c) simulation models using CDM produce smaller scale structures than those using Hot Dark Matter

d) CDM is likely baryonic

e) CDM particles should be more massive than HOT Dark Matter particles

 

Well, I believe that a and e are true, b and d are false, but I am totally unsure about c...is it true or false and why? Does anyone know?

 

Thank you!:)

 

I'd put and tick under this list of choices:

 

f) None of the above except c) need be true since no non-baryonic WIMP dark matter of any kind has ever been directly detected and identified in any experiment despite such matter supposedly needing to comprise at least 90% of all matter in the universe.;)