Negative phase velocity of electromagnetic waves and the cosmological constant

T. G. Mackay, S. Setiawan, A. Lakhtakia

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Examining the propagation of electromagnetic plane waves with the wavevector directed in opposition to the time-averaged Poynting vector in cosmological spacetime with piecewise uniform metric, we show that such negative-phase-velocity (NPV) propagation is possible in certain de Sitter spacetimes but not in anti-de Sitter spacetimes. This difference suggests the possibility of an optical/electromagnetic experiment to discern the cosmological constant of a four-dimensional universe stemming from a five-dimensional brane universe.

Original languageEnglish (US)
Pages (from-to)1-4
Number of pages4
JournalEuropean Physical Journal C
Issue numberSUPPL. 1
StatePublished - Jul 2005

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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