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A model of baryogenesis is introduced where our usual visible Universe is a3-brane coevolving with a hidden 3-brane in a multidimensional bulk. Thevisible matter and antimatter sectors are naturally coupled with the hiddenmatter and antimatter sectors, breaking the C/CP invariance and leading tobaryogenesis occurring after the quark-gluon era. The issue of leptogenesis isalso discussed. The symmetry breaking spontaneously occurs in relation to thepresence of an extra scalar field supported by the $U(1)\otimes U(1)$ gaugegroup, which extends the conventional electromagnetic gauge field in thetwo-brane universe. Scalar waves also emerge as potential dark mattercandidates and a means of constraining the model.

Violation of C/CP Symmetry Induced by a Scalar Field Emerging from a Two-Brane Universe: A Gateway to Baryogenesis and Dark Matter