# Quantization, String Theory **URL:** https://discuss.criticalfallibilism.com/t/quantization-string-theory/494 **Category:** Unbounded **Created:** [January 26, 2022, 12:36am UTC](https://discuss.criticalfallibilism.com/t/quantization-string-theory/494 "2022-01-26T00:36:22Z") **Posts on this page:** 1 **Showing post:** 6
### Author: ![lmf](https://discuss.criticalfallibilism.com/user_avatar/discuss.criticalfallibilism.com/lmf/32/1302_2.png) [@lmf](https://discuss.criticalfallibilism.com/u/lmf) #### Post date: [February 13, 2022, 9:41pm UTC](https://discuss.criticalfallibilism.com/t/quantization-string-theory/494/6 "2022-02-13T21:41:35Z")
> [@alanforr](#): > > From DD’s point of view a partially quantum mechanical theory is one in which you start from a classical theory and then apply a procedure called quantization to get a quantum theory. I think that’s a reasonable definition. Then I assume that a _fully (partially) quantum mechanical entity_ is defined to be an entity that plays a significant role in a fully (partially) quantum mechanical theory? If so, I think that definition is consistent with the implicit definition of the term I was using when I wrote this paragraph: > I don’t know exactly what a “fully quantum mechanical” entity is, but I don’t think that the particles in QFT count (nor do I think strings or branes count, but that’s a more complicated discussion). Particles arise when you try to write your path integral as an asymptotic series in ħ, so the assumption that quantum effects are small is _built into the whole formalism_ of perturbative QFT. Spelling it out explicitly: 1. Perturbative QFT (=summing over Feynman diagrams) is not a fully quantum mechanical theory, because it is obtained by applying a procedure called quantization to a classical theory 2. Particles in QFT are edges in Feynman diagrams 3. Therefore, particles in QFT are not fully quantum mechanical entities Do you agree with 3. now? --- _[View the full topic](https://discuss.criticalfallibilism.com/t/quantization-string-theory/494)._