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Weak Lensing and Gravity Theories

Published online by Cambridge University Press:  15 June 2005

Viviana Acquaviva ,
Carlo Baccigalupi  and
Francesca Perrotta
Viviana Acquaviva
Affiliation:
SISSA/ISAS, Via Beirut 4, 34014 Trieste, Italy, and INFN, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy email:acqua@sissa.it; bacci@sissa.it; perrotta@sissa.it
Carlo Baccigalupi
Affiliation:
SISSA/ISAS, Via Beirut 4, 34014 Trieste, Italy, and INFN, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy email:acqua@sissa.it; bacci@sissa.it; perrotta@sissa.it
Francesca Perrotta
Affiliation:
SISSA/ISAS, Via Beirut 4, 34014 Trieste, Italy, and INFN, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy email:acqua@sissa.it; bacci@sissa.it; perrotta@sissa.it
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Abstract

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We present the theory of weak gravitational lensing in cosmologies with generalized gravity, described in the Lagrangian by a generic function depending on the Ricci scalar and a non-minimally coupled scalar field.

We work out the generalized Poisson equations relating the dynamics of the fluctuating components to the two gauge invariant scalar gravitational potentials, fixing the new contributions from the modified background expansion and fluctuations.

We show how the lensing observables are affected by the cosmic expansion as well as by the presence of the anisotropic stress, which is non-null at the linear level both in scalar-tensor gravity and in theories where the gravitational Lagrangian term features a non-minimal dependence on the Ricci scalar. We derive the generalized expressions for the convergence power spectrum, and illustrate phenomenologically the new effects in Extended Quintessence scenarios, where the scalar field coupled to gravity plays the role of the dark energy.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS225 , July 2004 , pp. 123 - 128
Copyright
© 2004 International Astronomical Union