2005/07/31 by Giuseppe Milanesi, Martin O'Loughlin · 2 citations
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Class (philosophy) #Constraint (computer-aided design) #Gravitational singularity #Homotopy and Cohomology in Algebraic Topology #Moduli space #Naked singularity #Noncommutative and Quantum Gravity Theories #Null (SQL) #Space (punctuation) #Unitary state #gr-qc #hep-th
paper · pdf · doi:10.1088/1126-6708/2005/09/008
published as JHEP 0509:008,2005 · 34 pages, 7 figures, LaTeX. References added
arxiv created 2005/08/03 · openalex publication_date 2005/09/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study in detail the moduli space of solutions discovered in LLM relaxing the constraint that guarantees the absence of singularities. The solutions fall into three classes, non-singular, null-singular and time machines with a time-like naked singularity. We study the general features of these metrics and prove that there are actually just two generic classes of space-times - those with null singularities are in the same class as the non-singular metrics. AdS/CFT seems to provide a dual description only for the first of these two types of space-time in terms of a unitary CFT indicating the possible existence of a chronology protection mechanism for this class of geometries.