Blueshift of light rays induced by gravitational wave memory effect
arXiv:2604.12135 · doi:10.1088/1361-6382/ae59e7
Abstract
The article deals with photon propagation in pp-wave spacetimes in the strong gravitational-wave regime and its consequences for redshift measurements. We show that null geodesics crossing a localized pp-wave pulse exhibit an energy memory effect, producing a finite asymptotic shift in the photon frequency measured by static observers. This path-dependent contribution acts directly on the redshift observable and may help account for divergent interpretations of supernova redshift data in the presence of intervening gravitational radiation.
7 pages, 6 figures
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