If, and you can take this with a pinch of salt, quantum field theory is correct then everything, with the possible exception of gravity, is explainable as a field (there are a few heretical theories that are now basing the standard model on geometric quantisation but I digress).
electromagnetism, the electron, the quarks, the gluons, the weak force bosons, the higgs - these are all part of the model
gravitics requires an addition to the above
jump requires an addition to the above
real gravity may never be part of the above (no quantum gravity and no graviton)
Traveller also postulates meson technology and nuclear damper technology.
Now meson tech could be based on manipulating quarks and gluons, while damper tech adds W/Z manipulation. My postulation is that the higgs is likely manipulated to pave the way to jump.
Traveller has these breakthroughs, but the TL of a culture is not defined by them.
TL8 gravitics
TL9 jump
TL11 meson
TL12 damper