Type N spacetimes as solutions of extended new massive gravity
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KünyeHAJI, A., ALIEV, A.N. (2012). Type N spacetimes as solutions of extended new massive gravity. Physic Letters B, 711 (1), pp. 117-121. http://dx.doi.org/10.1016/j.physletb.2012.03.061.
We study algebraic type N spacetimes in the extended new massive gravity (NMG), considering both the Born-Infeld model (BI-NMG) and the model of NMG with any finite order curvature corrections. We show that for these spacetimes, the field equations of BI-NMG take the form of the massive (tensorial) Klein-Gordon type equation, just as it happens for ordinary NMG. This fact enables us to obtain the type N solution to BI-NMG, utilizing the general type N solution of NMG, earlier found in our work. We also obtain type N solutions to NMG with all finite order curvature corrections and show that, in contrast to BI-NMG, this model admits the critical point solutions, which are counterparts of "logarithmic" AdS pp-waves solutions of NMG.