English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Strong lensing, plane gravitational waves and transient flashes

MPS-Authors
/persons/resource/persons26301

Harte,  Abraham I.
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

Locator
There are no locators available
Fulltext (public)

1210.1449
(Preprint), 1021KB

CQG_30_7_075011.pdf
(Any fulltext), 731KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Harte, A. I. (2013). Strong lensing, plane gravitational waves and transient flashes. Classical and quantum gravity, 30(7): 075011. doi:10.1088/0264-9381/30/7/075011.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-0D34-7
Abstract
Plane-symmetric gravitational waves are considered as gravitational lenses. Numbers of images, frequency shifts, mutual angles, and image distortion parameters are computed exactly in essentially all non-singular plane wave spacetimes. For a fixed observation event in a particular plane wave spacetime, the number of images is found to be the same for almost every source. This number can be any positive integer, including infinity. Wavepackets of finite width are discussed in detail as well as waves which maintain a constant amplitude for all time. Short wavepackets are found to generically produce up to two images of each source which appear (separately) only some time after the wave has passed. They are initially infinitely bright, infinitely blueshifted images of the infinitely distant past. Later, these images become dim and acquire a rapidly-increasing redshift. For sufficiently weak wavepackets, one such "flash" almost always exists. The appearance of a second flash requires that the Ricci tensor inside the wave exceed a certain threshold. This might occur if a gravitational plane wave is sourced by, e.g., a sufficiently strong electromagnetic plane wave.