Passage of radiation through wormholes of arbitrary shape
- Department of Physics, Kyoto University, Kyoto 606-8501 (Japan) and Theoretical Astrophysics, Eberhard-Karls University of Tuebingen, Tuebingen 72076 (Germany)
We study quasinormal modes and scattering properties via calculation of the S matrix for scalar and electromagnetic fields propagating in the background of spherically symmetric and axially symmetric traversable Lorentzian wormholes of a generic shape. Such wormholes are described by the general Morris-Thorne ansatz. The properties of quasinormal ringing and scattering are shown to be determined by the behavior of the wormhole's shape function b(r) and shift factor {Phi}(r) near the throat. In particular, wormholes with the shape function b(r), such that b{sup '}(r){approx_equal}1, have very long-lived quasinormal modes in the spectrum. We have proved that the axially symmetric traversable Lorentzian wormholes, unlike black holes and other compact rotating objects, do not allow for superradiance. As a by-product we have shown that the 6th order WKB formula used for scattering problems of black or wormholes gives quite high accuracy and thus can be used for quite accurate calculations of the Hawking radiation processes around various black holes.
- OSTI ID:
- 21413226
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 81, Issue 12; Other Information: DOI: 10.1103/PhysRevD.81.124036; (c) 2010 The American Physical Society; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Wormholes versus black holes: quasinormal ringing at early and late times
Wormhole dynamics in spherical symmetry
Related Subjects
ACCURACY
AXIAL SYMMETRY
BLACK HOLES
BY-PRODUCTS
COMPUTERIZED SIMULATION
ELECTROMAGNETIC FIELDS
S MATRIX
SCALAR FIELDS
SCATTERING
SPECTRA
SUPERRADIANCE
WKB APPROXIMATION
APPROXIMATIONS
CALCULATION METHODS
EMISSION
ENERGY-LEVEL TRANSITIONS
MATRICES
PHOTON EMISSION
SIMULATION
STIMULATED EMISSION
SYMMETRY