The best replacement for relativity is quantum mechanics.

The best alternatives to relativity are rated as following:
★★★★★  quantum mechanics
★★★★  general relativity
★★★  quantum
★★  special relativity
★  quantum physics
★  absolutism
★  concordance
★  general theory of relativity
★  ringtail
★  linguistic determinism
  ethnocentrism
  clearwell
  universality
  classical mechanics
  quantum mechanics theories
  moral absolutism
  newtonian physics
  subjectivity

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Speaking about relativity, one probably shouldn't forget about relativity.

Other search terms related to relativity and their ratings are:
★★★★★ relativity
★ quantum theory
★ tensors
★ quantum mechanics
★ relativity barbour
cosmology
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relativity
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general relativity