Confused about String Mass Calculation in R & NS Sectors?

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SUMMARY

The discussion centers on the confusion surrounding string mass calculations in the R and NS sectors of string theory, specifically referencing the Becker, Becker, & Schwarz book. It is established that the R sector contains fermions while the NS sector contains bosons. However, the mass squared in both sectors depends on the sum of bosonic and fermionic oscillator coefficients, leading to questions about the rationale behind this approach. Clarification indicates that the terms refer to spacetime fermions and bosons rather than world-sheet counterparts.

PREREQUISITES
  • Understanding of string theory fundamentals
  • Familiarity with the Becker, Becker, & Schwarz textbook
  • Knowledge of bosonic and fermionic oscillator coefficients
  • Basic concepts of R and NS sectors in string theory
NEXT STEPS
  • Study the mathematical framework of string mass calculations in string theory
  • Explore the differences between spacetime and world-sheet fermions and bosons
  • Review advanced topics in the Becker, Becker, & Schwarz book
  • Investigate the implications of oscillator coefficients in string theory
USEFUL FOR

This discussion is beneficial for theoretical physicists, string theory researchers, and students seeking clarity on string mass calculations and the distinctions between R and NS sectors.

lkwarren01
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I'm an engineer trying to get some understanding of string theory. I'm reading the Becker, Becker, & Schwarz book & am confused about the string mass calc in the R & NS sectors. As I understand it, the R sector contains fermions & NS has bosons. Yet, the mass squared in R depends on the sum of bosonic & fermionic oscillator coefficients. Same w/ NS sector. Why not bosonic oscillators only in NS & fermionic oscillators only in R sector for the mass calc?

Thanks to anyone taking the time to read this
Larry Warren
Joliet, IL
 
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lkwarren01 said:
...As I understand it, the R sector contains fermions & NS has bosons. Yet, the mass squared in R depends on the sum of bosonic & fermionic oscillator coefficients. Same w/ NS sector. Why not bosonic oscillators only in NS & fermionic oscillators only in R sector for the mass calc?
They mean spacetime fermions and bosons, not world-sheet fermions and bosons.
 

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