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We study the detector's response when moving along an ingoing null geodesic.The backgrounds are chosen to be black hole spacetimes ($(1+1)$ dimensionalSchwarzschild metric and near horizon effective metric for any stationary blackhole in arbitrary dimensions) as well as Friedmann-Lemaitre-Robertson-Walker(FLRW) Universe. For black holes the trajectories are defined in Schwarzschildcoordinates and the field modes are corresponding to {\it Boulware vacuum}.Whereas for FLRW case, the detector is moving along the path defined inoriginal {\it cosmic time} and the field modes are related to {\it conformalvacuum}. The analysis is done for three stages (de-Sitter, radiation dominatedand matter dominated) of the Universe. We find that, although the detector isfreely falling, it registered particles in the above mentioned respectivevacuums. We confirm this by different approaches. The detection probabilitydistributions, in all situations, are thermal in nature.

Detector response along null geodesics in black hole spacetimes and in a Friedmann-Lemaitre-Robertson-Walker Universe