The discussion revolves around a specific problem from Zwiebach's text, specifically QC 8.7, which involves equations related to string theory concepts. Participants are trying to determine the appropriate equation to use for this calculation.
Participants are actively engaging with the problem, offering alternative approaches and clarifying the reasoning behind suggested modifications. There is a productive exchange of ideas, although no consensus has been reached on the best method to proceed.
There is mention of specific equations from the text and concerns about unit consistency in the context of different systems of units, which may affect the validity of the proposed substitutions.
You should use equations (3.88) on page 54 but replace the equation for G with the equation for [itex]\alpha'[/itex]. Then follow the technique on that page.ehrenfest said:Is there another equation I should use?
There are three equations labeled (3.88). Replace all of the P subscripts with S. Toss out the equation that defines G and use equation (8.63) in its place. Express [itex]\sqrt{\alpha'}[/itex] in terms of [itex]{l}_S, {m}_S,[/itex] and [itex]{t}_S[/itex].ehrenfest said:Sorry, can you explain what you mean replace the equation for G with the equation for alpha' (8.63 I assume)? G and J/hbar do not even have the same units.