## Abstract

We describe two interesting effects in wormhole physics. First, we find that a genuinely charged matter source of gravity and electromagnetism may appear electrically neutral to an external observer - a phenomenon opposite to the famous Misner-Wheeler "charge without charge" effect. We show that this phenomenon takes place when coupling a bulk gravity/nonlinear-gauge-field system self-consistently to a codimension-one charged lightlike brane as a matter source. The "charge-hiding" effect occurs in a self-consistent wormhole solution of the above coupled gravity/nonlinear-gauge-field/lightlike- brane system which connects a noncompact "universe," comprising the exterior region of Schwarzschild-(anti-)de Sitter (or purely Schwarzschild) black hole beyond the internal (Schwarzschild) horizon, to a Levi-Civita-Bertotti-Robinson-type ("tube-like") "universe" with two compactified dimensions via a wormhole "throat" occupied by the charged lightlike brane. In this solution the whole electric flux produced by the charged lightlike brane is expelled into the compactified Levi-CivitaBertottiRobinson-type "universe" and, consequently, the brane is detected as neutral by an observer in the Schwarzschild-(anti-)de Sitter "universe." Next, the above "charge-hiding" solution can be further generalized to a truly charge-confining wormhole solution when we couple the bulk gravity/nonlinear-gauge-field system self-consistently to two separate codimension-one charged lightlike branes with equal in magnitude but opposite charges. The latter system possesses a "two-throat" wormhole solution, where the "left-most" and the "right-most" "universes" are two identical copies of the exterior region of the neutral Schwarzschildde Sitter black hole beyond the Schwarzschild horizon, whereas the "middle" "universe" is of generalized Levi-CivitaBertottiRobinson "tube-like" form with geometry dS _{2} ×S^{2} (dS_{2} being the two-dimensional de Sitter space). It comprises the finite-extent intermediate region of dS _{2} between its two horizons. Both "throats" are occupied by the two oppositely charged lightlike branes and the whole electric flux produced by the latter is confined entirely within the middle finite-extent "tube-like" "universe." A crucial ingredient is the special form of the nonlinear gauge field action, which contains both the standard Maxwell term as well as a square root of the latter. This theory was previously shown to produce a QCD-like confining dynamics in flat spacetime.

Original language | English |
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Pages (from-to) | 5211-5239 |

Number of pages | 29 |

Journal | International Journal of Modern Physics A |

Volume | 26 |

Issue number | 30-31 |

DOIs | |

State | Published - 20 Dec 2011 |

## Keywords

- Generalized Levi-CivitaBertottiRobinson spaces
- QCD-like charge confinement
- dynamically generated cosmological constant
- wormholes connecting noncompact with compactified "universes"
- wormholes via lightlike branes

## ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Astronomy and Astrophysics