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Exploring degeneracies in modified gravity with weak lensing

By considering linear-order departures from general relativity, we compute a novel expression for the weak lensing convergence power spectrum under alternative theories of gravity. This comprises an integral over a 'kernel' of general relativistic quantities multiplied by a theory-dependent 'source' term. The clear separation between theory-independent and -dependent terms allows for an explicit understanding of each physical effect introduced by altering the theory of gravity. We take advantage of this to explore the degeneracies between gravitational parameters in weak lensing observations.

preprint2015arXivOpen access
C. Danielle LeonardTessa BakerPedro G. Ferreira
astro-ph.COgr-qc
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C. Danielle LeonardTessa BakerPedro G. Ferreira

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