I describe an experimental method for the detection of cosmological future-boundary radiation (e.g. radiation produced by time-reversed stars or a Big Crunch). Previous proposed experiments of this nature have not fully taken into account the difficulties inherent in measuring radiation produced by a future source. The method described here relies on the two-photon decay of metastable singlet He(1s 2s), and quantifies the probability for future-boundary radiation to stimulate this process. High-resolution spectroscopy of the observable decay photons would permit quantitative measurements of certain future-boundary radiation sources.
This paper was recently presented and will soon be published in a conference proceedings; I will not post the paper on this site until after publication. If you would like a preprint, please email me at the below address.