Cosmology Seminar - Natalie Hogg (IFT Madrid): : "The distance duality relation: violations, constraints and biases"



15:00 hrs


Online via Zoom



The distance duality relation tells us that the luminosity and angular diameter distances to an object should be the same, given that photons propagate on null geodesics in a pseudo-Riemannian
spacetime, and that photon number is conserved. We explore how standard sirens can be used to probe a violation of this relation, and forecast the constraints that will be achieved on this violation by the Einstein Telescope, an upcoming third generation gravitational wave detector. Furthermore, we show how the presence of modified gravity can bias such constraints, uncovering a potential smoking
gun for a modified gravity model with a particular screening phenomenology.



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Meeting ID: 678 9719 8882

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