(e) Write down the general relativistic equation for cosmic acceleration derived in class (d/a = ...), where a = a(t) is the cosmological scale factor. Taking p and P to refer to Dark Energy, and using your result from part (d), express i/a in terms of p. (f) |3 points| What is the general solution to an equation of the form afa = T2, where T is a constant? Differentiate vour general solution to verify that this is correct. (z) During the present epoch, the mass density of Dark Energy 13 equivalent to about 5 protons m3. What is the corresponding time scale, T, expressed in billions of years