Monday, February 25, 2013

1302.5560 (Efstathios Charalampidis et al.)

Wormholes Threaded by Chiral Fields    [PDF]

Efstathios Charalampidis, Theodora Ioannidou, Burkhard Kleihaus, Jutta Kunz
We consider Lorentzian wormholes with a phantom field and chiral matter fields. The chiral fields are described by the non-linear sigma model with or without a Skyrme term. When the gravitational coupling of the chiral fields is increased, the wormhole geometry changes. The single throat is replaced by a double throat with a belly inbetween. For a maximal value of the coupling, the radii of both throats reach zero. Then the interior part pinches off, leaving a closed universe and two (asymptotically) flat spaces. A stability analysis shows that all wormholes threaded by chiral fields inherit the instability of the Ellis wormhole.
View original: http://arxiv.org/abs/1302.5560

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