A Fisher forecast shows LISA could bound graviton diffusion/drift parameters κ1, κ2 down to about 10^-56 kg m^2 s^-3, improving CMB bounds by 12 orders of magnitude, if a phase-transition or PBH background is detected.
Polarization Diffusion from Spacetime Uncertainty
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A model of Lorentz invariant random fluctuations in photon polarization is presented. The effects are frequency dependent and affect the polarization of photons as they propagate through space. We test for this effect by confronting the model with the latest measurements of polarization of Cosmic Microwave Background (CMB) photons.
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Covariant diffusion and drift of the stochastic GW background with LISA
A Fisher forecast shows LISA could bound graviton diffusion/drift parameters κ1, κ2 down to about 10^-56 kg m^2 s^-3, improving CMB bounds by 12 orders of magnitude, if a phase-transition or PBH background is detected.