Traversable wormhole arises as a solution to the Einstein field equations and was first proposed by Morris and Thorne as time travel machines. The idea of wormhole spacetime was given by J.A. Wheeler in his attempt to apply quantum mechanics at the Planck scale. The resulting spacetime turns out to be fluctuating giving rise a number of topologies including the wormhole. A static and spherically symmetric wormhole possesses interesting geometry having a throat that flares out in two opposite directions. The throat connects either two different asymptotically flat regions in the same spacetime or entirely two distinct spacetimes. Later on, Ellis termed this geometry as a ‘drainhole’ that could render particle motion from either mouths. The throat has the tendency to get closed in a very short time (of the order of Planck time) thereby limiting the time travel possibility. In order to create a stable wormhole, a negative energy (or the exotic matter) is required to keep the wormhole’s throat open. Such a negative energy thus violates the null energy condition (NEC). Since NEC is the weakest energy condition, it implies that all the energy conditions (weak, strong and dominant) will be violated automatically. These energy conditions are generally obeyed by the classical matter but are violated by certain quantum fields which exhibit the Casimir effect and the Hawking evaporation process.
A week before, I wrote an article entitled, “How Would A Particle Travel Through A Rotating Wormhole?”, in which I described about the study which showed that neutral test particles propagating towards the rotating wormhole radially, start moving about the wormhole in the spiral path. After entering the wormhole’s throat, the particles pass through the throat and move away from the throat following the spiral trajectories.
You might be thinking why I am talking about that now. Well, it’s because few days before, I came across research work of Mubashir Jamil et al., in which they considered the possibility of a rotating wormhole surrounded by a cloud of charged particles and due to slow rotation of the wormhole, the charged particles are dragged, thereby producing an electromagnetic field.
We considered stationary and axially symmetric wormhole having non-zero angular velocity surrounded by the continuum of charged particles that are dragged by the wormhole in the angular direction.— told Mubashir Jamil.
They assumed, rotation to be negligible, so that quadratic terms in the angular velocity are ignored. They found that frame dragging effects on the charged particles produces a poloidal electromagnetic field. They also determined resulting field around the wormhole under the slow rotation approximation. The source of this field is the charge density which surrounds the wormhole. The distribution of charges is assumed to be spherically symmetrical.
Our model predicts the production of the electromagnetic field with a certain radiation flux due to wormhole rotation.— said Mubashir Jamil, lead author of the study
They concluded that this feature of the wormhole physics can be of interest from astronomical point of view.
Reference: Jamil, M. Can a Wormhole Generate Electromagnetic Field?. Int J Theor Phys 49, 1549–1555 (2010). https://link.springer.com/article/10.1007/s10773-010-0335-0 https://doi.org/10.1007/s10773-010-0335-0
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