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I'd like to know your interpretation.

EhsanZ
in Astronomy and Cosmology

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With Hobson's notation:

 

H=(da/dt)/a

 

dH/dt = ((d2a/dt2)/a) - ((da/dt)/a)2

 

If ((d2a/dt2)/a) is negative, (dH/dt) is certainly negative.

But if ((d2a/dt2)/a) is positive, (dH/dt) can be positive or negative.

 

What is your interpretation?

 

 

I gave you the answer on another forum. The second term is wrong. It should be (da/dt)/a2

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I gave you the answer on another forum. The second term is wrong. It should be (da/dt)/a2

 

 

I gave you the answer on another forum. You made a mistake my friend! This term is correct.

I gave you the answer on another forum. You made a mistake my friend! This term is correct.

 

 

No, it should end (ta/da!)

 

Then it works on loads of levels...

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