We investigate the origin of spatial offsets between baryonic matter and gravitational lensing peaks observed in colliding galaxy clusters, such as the Bullet Cluster. While such offsets are commonly interpreted as evidence for collisionless dark matter, we explore an alternative mechanism based on delayed dynamical response within an effective memory framework. In the Effective Viscoelastic Medium (EVM) framework, gravity is not modified at the fundamental level. Instead, the large-scale matter distribution exhibits a finite relaxation timescale, leading to a delayed response in the effective gravitational component. Using a minimal one-dimensional collision model, we demonstrate that transient spatial offsets between baryonic and effective gravitational peaks naturally emerge during the collision process. These results suggest that cluster-scale lensing offsets may partially reflect dynamical response effects, providing a complementary perspective on the interpretation of gravitational lensing observations. This work presents a qualitative mechanism and serves as a foundation for future quantitative and multidimensional studies.
Chang sik Kim (Sat,) studied this question.