Research Article | Open Access
Neutron Star Interiors and Topology Change
Quark matter is believed to exist in the center of neutron stars. A combined model consisting of quark matter and ordinary matter is used to show that the extreme conditions
Research Article | Open Access
Neutron Star Interiors and Topology Change
Quark matter is believed to exist in the center of neutron stars. A combined model consisting of quark matter and ordinary matter is used to show that the extreme conditions existing in the center could result in a topology change, that is, in the formation of wormholes.
Wormholes are handles or tunnels in the spacetime topology connecting different parts of our universe or of different universes. The meticulous analysis in  has shown that such wormholes may be actual physical objects permitting two-way passage.
Also introduced in  is the metric for a static spherically symmetric wormhole; namely, where. Here is the shape function and is the redshift function, which must be everywhere finite to prevent an event horizon. For the shape function we must have, where is the radius of the throat of the wormhole and also and to satisfy the flare-out condition. We are using geometrized units where.
While Morris and Thorne concentrated on traversable wormholes suitable for hum