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Astron. Astrophys. 332, 1154-1158 (1998)

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Lensing by gravitational waves in scalar-tensor gravity:
Einstein frame analysis

Valerio Faraoni 1 and Edgard Gunzig 2, 3

1 Inter-University Centre for Astronomy and Astrophysics Post Bag 4, Ganeshkhind, Pune 411 007, India (faraoni@iucaa.ernet.in)
2 RGGR, Faculté des Sciences, Campus Plaine, Université Libre de Bruxelles Boulevard du Triomphe, CP 231, B-1050 Bruxelles, Belgium
3 Institutes Internationaux de Chimie et Physique Solvay (egunzig@ulb.ac.be)

Received 14 November 1997 / Accepted 12 January 1998

Abstract

The amplification of a light beam due to intervening gravitational waves is studied. The previous Jordan frame result according to which the amplification is many orders of magnitude larger in scalar-tensor gravity than in general relativity does not hold in the Einstein conformal frame. Lensing by gravitational waves is discussed in relation to the ongoing and proposed VLBI observations aimed at detecting the scintillation effect.

Key words: gravitation – gravitational waves – relativity – gravitational lensing

Send offprint requests to: V. Faraoni

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© European Southern Observatory (ESO) 1998

Online publication: March 30, 1998
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