Manifest Background-independence
This is primarily an aesthetic rather than a physical requirement. It is analogous to requiring in differential geometry that equations be written in a form that is independent of the choice of charts and coordinate embeddings. If a background-independent formalism is present, it can lead to simpler and more elegant equations. However there is no physical content in requiring that a theory be manifestly background-independent – for example, the equations of general relativity can be rewritten in local coordinates without affecting the physical implications.
Read more about this topic: Background Independence
Famous quotes containing the word manifest:
“You should never assume contempt for that which it is not very manifest that you have it in your power to possess, nor does a wit ever make a more contemptible figure than when, in attempting satire, he shows that he does not understand that which he would make the subject of his ridicule.”
—William Lamb Melbourne, 2nd Viscount (1779–1848)