# Boundarylike behaviors of the resonance interatomic energy in a cosmic string spacetime. (arXiv:1802.01699v1 [gr-qc])

By generalizing the formalism proposed by Dalibard, Dupont-Roc and Cohen

Tannoudji, we study the resonance interatomic energy of two identical atoms

coupled to quantum massless scalar fields in a symmetric /antisymmetric

entangled state in the Minkowski and cosmic string spacetimes. We find that in

both spacetimes, the resonance interatomic energy has nothing to do with the

field fluctuations but is attributed to the radiation reaction of the atoms

only. We then concretely calculate the resonance interatomic energy of two

static atoms near a perfectly reflecting boundary in the Minkowski spacetime

and near an infinite and straight cosmic string respectively. We show that the

resonance interatomic energy in both cases can be enhanced or suppressed and

even nullified as compared with that in an unbounded Minkowski spacetime,

because of the presence of the boundary in the Minkowski spacetime or the

nontrivial spacetime topological structure of the cosmic string. Besides, we

also discover that the resonance interatomic energy in the cosmic string

spacetime exhibits some peculiar properties, making it in principle possible to

sense different cosmic string spacetimes via the resonance interatomic energy.