# Groupe de Physique Statistique

## Equipe 106, Institut Jean Lamour

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### Articles dans des revues à comité de lecture

 Mimicking Kleinian cosmology with electronic metamaterials Figueirido D., Gomes F.A., Fumeron S., Berche B. and Moraes F. Phys. Rev. D 94 (2016) 044039 DOI : 10.1103/PhysRevD.94.044039 ArXiv : arxiv:1608.03812 [PDF] This paper deals with the propagation of Klein-Gordon particles in flat background spacetime exhibiting discontinuous metric changes from a Lorentzian signature $(-,+,+,+)$ to a Kleinian signature $(-,+,+,-)$. A formal analogy with the propagation of electrons at a junction between an anisotropic semiconductor and an electronic metamaterial is presented. From that analogy, we study the dynamics of these particles falling onto planar boundaries interfaces between these two families of media and show a mirror-like behavior for the particle flux. Finally, the case of double junction of finite thickness is examined and the possibility of tunneling through it is discussed. A physical link between the metamaterial and the Kleinian slabs is found by calculating the time of flight of the respective traversing particles.