hierarchy problem

**standard model of particle physics**

**matter field fermions** (spinors, Dirac fields)

flavors of fundamental fermions in the standard model of particle physics | |||
---|---|---|---|

generation of fermions | 1st generation | 2nd generation | 3d generation |

quarks | |||

up-type | up quark | charm quark | top quark |

down-type | down quark | strange quark | bottom quark |

leptons | |||

charged | electron | muon | tauon |

neutral | electron neutrino | muon neutrino | tau neutrino |

(also: antiparticles)

**hadron** (bound states of the above quarks)

**minimally extended supersymmetric standard model**

bosinos:

**dark matter candidates**

**Exotica**

What is called the *hierarchy problem* is an issue in phenomenology and model building, notably in the standard model of particle physics, concerning discrepancies between the electroweak and Planck scale. For instance, the masses of the W and Z particles, the force carriers of the weak nuclear force, are about 10,000 trillion times smaller than the Planck mass. Thus there is a huge hierarchy in the mass scales of weak nuclear forces and gravity. See Strassler for review.

In the context of M-theory on G2-manifolds (the G2-MSSM) a generic solution to the hierarchy problem is proposed in (Acharya-Kane-Kumar 12, section V.A.2 (p. 10-11)) due to control over non-perturbative effects from membrane instantons, which due to their exponential nature, provide the exponential hierarchy.

- Matthew Strassler,
*The Hierarchy Problem*(web)

In the context of M-theory on G2-manifolds/G2-MSSM a solution is proposed in

- Bobby Acharya, Gordon Kane, Piyush Kumar, section V.A.2 (p. 10-11) of
*Compactified String Theories – Generic Predictions for Particle Physics*, Int. J. Mod. Phys. A, Volume 27 (2012) 1230012 (arXiv:1204.2795)

Last revised on January 22, 2020 at 01:47:38. See the history of this page for a list of all contributions to it.