Adjective
Not physical.
Not supported by, or contrary to, the laws of physics.
Source: en.wiktionary.orgI'm very unphysical and graceless so basically if you save 10 people to be with you in a resistance movement, you would never save me. I'd be the last one. Connor Jessup
However, since s is an unphysical parameter, physical states must be left invariant by "s-evolution", and so the physical state space is the kernel of (this requires the use of a rigged Hilbert space and a renormalization of the norm). Source: Internet
However, the transient virtual photons of quantum electrodynamics may also adopt unphysical polarization states. Source: Internet
Richard Feynman considered potential flow to be so unphysical that the only fluid to obey the assumptions was "dry water" (quoting John von Neumann). Source: Internet
Such an interaction averts the unphysical Big Bang singularity, replacing it with a cusp-like bounce at a finite minimum scale factor, before which the Universe was contracting. Source: Internet
These solutions have so-called naked singularities that can be observed from the outside, and hence are deemed unphysical. Source: Internet