Coley, A.A.Gregoris, D.Lim, Woei Chet2017-04-0520162017-04-052016Coley, A. A., Gregoris, D., & Lim, W. C. (2016). On the first G₁ stiff fluid spike solution in General Relativity. Classical and Quantum Gravity, 33(21). https://doi.org/10.1088/0264-9381/33/21/2150100264-9381https://hdl.handle.net/10289/10978Using the Geroch transformation we obtain the first example of an exact stiff fluid spike solution to the Einstein field equations in a closed form exhibiting a spacelike G₁ group of symmetries (i.e., with a single isometry). This new solution is of Petrov type I and exhibits a spike crossing which persists to the past, which allows us to better understand spike crossings in the context of structure formation.application/pdfenThis is an author’s accepted version of an article published in the journal: Classical and Quantum Gravity. © 2016 IOP Publishing Ltd.Science & TechnologyPhysical SciencesAstronomy & AstrophysicsPhysics, MultidisciplinaryPhysics, Particles & FieldsPhysicsGeroch's transformationspikestiff fluidCOSMOLOGICAL MODELSEQUATIONSJournal Article10.1088/0264-9381/33/21/2150101361-6382