A new theory expands on other theories and adds photon energy “fluid” as a way to support wormholes. The introduction to the paper states the following.

Wormholes are hypothetical geometrical structures connecting two universes or two distant parts of the same universe. For a simple visual explanation of a wormhole, consider spacetime visualized as a two-dimensional (2D) surface. If this surface is folded along a third dimension, it allows one to picture a wormhole “bridge”. [1]

“A possible cause of the late-time cosmic acceleration is an exotic ﬂuid with an equation of state lying within the phantom regime, i.e., w = p/ρ < −1. The latter violates the null energy condition, which is a fundamental ingredient in wormhole physics. Thus, cosmic phantom energy may, in principle, provide a natural ﬂuid to support wormholes. In this work, we extend previous solutions, by carefully constructing a speciﬁc shape function which provides asymptotically ﬂat wormhole solutions supported by the phantom energy equation of state, where the energy density and pressures vanish at large distances as ∼ 1/rn, with n > 0. Thus, there is no need to surgically paste the interior wormhole geometry to an exterior vacuum spacetime. We also consider the “volume integral quantiﬁer”, which provides useful information regarding the total amount of energy condition violating matter, and show that, in principle, it is possible to construct asymptotically ﬂat wormhole solutions with an arbitrary small amount of energy condition violating matter.”[2]

FIG. 1: The plot depicts the function H(x, a), for α = 1/2 and where the parameter x = r0/r, lying in the range 0 < x ≤ 1, has been deﬁned in order to deﬁne the entire spacetime. It is transparent that H(x, a) is negative throughout the entire range of x

By using this theory an advanced civilization would , in theory, be able to mine photon “fluid” for Phantom Energy to construct micro worm holes for such things as transportation.

There are many wormhole theories, here is a youtube video of Stephen Hawking explaining one of those theories.

For more information about the paper “New asymptotically ﬂat phantom wormhole solutions**“,** please visit this link.