Recently the distribution of pressure inside the proton has been mapped by using which theory ...

Recently the distribution of pressure inside the proton has been mapped by using which theory and where? What is its assumption?

The distribution of pressure inside the proton has been mapped using the theory of quantum chromodynamics (QCD), which is the theory that describes the strong nuclear force, the force that holds protons and neutrons together in the nucleus of an atom. This mapping was done using a technique called lattice QCD, which involves simulating the behavior of quarks and gluons (the fundamental particles that make up protons and neutrons) on a lattice, or grid, using powerful computers.

Lattice QCD makes several assumptions, including that the quarks and gluons are confined within the proton and that the strong force between them is described by QCD. It also assumes that the proton can be treated as a system in thermal equilibrium, meaning that it has reached a state of balance and stability.

This mapping of the distribution of pressure inside the proton has allowed scientists to gain a better understanding of the structure of protons and how they are held together. It has also provided insights into the behavior of quarks and gluons at high energies and allowed for the development of more accurate models of the strong force.