Context: In particle physics, this inequality permits a qualitative understanding of virtual particles which carry momentum, exchange by which and with real particles, is responsible for the creation of all known fundamental forces (more accurately known as fundamental interactions). Virtual photons (which are simply lowest quantum mechanical energy state of photons) are also responsible for electrostatic interaction between electric charges (which results in Coulomb law), for spontaneous radiative decay of exited atomic and nuclear states, for the Casimir force, for van der Waals bond forces and some other observable phenomena.

Question: What are simply lowest quantum mechanical energy state of photons?
Answer: Virtual photons

Question: What is responsible for electrostatic interaction between electric charges?
Answer: Virtual photons

Question: What results in Coulomb law?
Answer: electrostatic interaction between electric charges

Question: What are simply highest quantum mechanical energy state of photons?
Answer: Unanswerable

Question: What is responsible for non-electrostatic interaction between electric charges?
Answer: Unanswerable

Question: What results in Casimir law?
Answer: Unanswerable

Question: In what type of physics, does this equality permit a qualitative understanding of virtual particles which carry momentum?
Answer: Unanswerable

Question: what is not known as fundamental forces?
Answer: Unanswerable