Collider observables of a pseudoscalar mediator resonance can become sensitive to the sound speed of dark energy fluctuations via modified propagation in a dark energy background.
Hu, Structure Formation with Generalized Dark Matter, Astrophys
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Using CMB, SN, BAO and shear data, the work shows dynamical dark energy in MG models correlates with deviations from GR below z=2 at >95% CL, a link that holds for varying sound speed but vanishes for a cosmological constant.
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Collider Probes of Dark Energy Microphysics
Collider observables of a pseudoscalar mediator resonance can become sensitive to the sound speed of dark energy fluctuations via modified propagation in a dark energy background.
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The sound of dynamical dark energy and modified gravity
Using CMB, SN, BAO and shear data, the work shows dynamical dark energy in MG models correlates with deviations from GR below z=2 at >95% CL, a link that holds for varying sound speed but vanishes for a cosmological constant.