# Fundamental Dimensionless numbers- - P


## https://en.wikipedia.org/wiki/Dimensionless_physical_constant


## https://en.wikipedia.org/wiki/Dirac_large_numbers_hypothesis

 - [Dirac's original paper](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5431/dirac.pdf)

- 2015 [Naturalness Under Stress](https://arxiv.org/pdf/1501.01035.pdf) Michael Dine



> Most of the parameters of the Standard Model (SM) are natural in the sense of ’t Hooft. But there are some quantities which are not. It is precisely the failures of   dimensional analysis which are most interesting. As for the electron and proton masses, they have the potential to point to possible new phenomena in nature – new degrees of freedom, interactions and/or symmetries. For a long time, these sorts of puzzles have served as a guide to speculation about physics beyond the Standard Model

- [Dimensionless constants, cosmology and other dark matters](https://arxiv.org/pdf/astro-ph/0511774.pdf) 2006

>We identify 31 dimensionless physical constants required by particle physics and cosmology, and
emphasize that both microphysical constraints and selection effects might help elucidate their origin

## [How fundamental are fundamental constants?](https://arxiv.org/pdf/1412.2040.pdf) 2013  - M. J. Duff

[Dimensionless constants and cosmological measurements](https://arxiv.org/pdf/1304.0577.pdf) J. Rich

https://www.forbes.com/sites/startswithabang/2018/11/16/how-many-fundamental-constants-does-it-take-to-explain-the-universe/?sh=164410fd4b7c




# Parents

* Particle Physics

# Attachments

* [](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5431/dirac.pdf)