M^{\mu \nu} Tau-Indep: Zwiebach Pg 229

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Homework Statement


Why does Zwiebach say that M^{\mu \nu} is guarenteed to be tau-independent in the paragraph below equation 12.155?

Homework Equations


The Attempt at a Solution

 
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See the discussion between equations (8.61) and (8.62) on page 144.
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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