Every graph G can be represented by a collection of equi-radii spheres in a d-dimensional metric Delta such that there is an edge uv in G if and only if the spheres corresponding to u and v intersect. The smallest integer d such that G can be represented by a collection of spheres (all of the same radius) in Delta is called the sphericity of G, and if the collection of spheres are non-overlapping, then the value d is called the contact-dimension of G. In this paper, we study the sphericity and contact dimension of the complete bipartite graph K_{n,n} in various L^p-metrics and consequently connect the complexity of the monochromatic closest pair and bichromatic closest pair problems.
@InProceedings{david_et_al:LIPIcs.SoCG.2018.28, author = {David, Roee and C. S., Karthik and Laekhanukit, Bundit}, title = {{On the Complexity of Closest Pair via Polar-Pair of Point-Sets}}, booktitle = {34th International Symposium on Computational Geometry (SoCG 2018)}, pages = {28:1--28:15}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-066-8}, ISSN = {1868-8969}, year = {2018}, volume = {99}, editor = {Speckmann, Bettina and T\'{o}th, Csaba D.}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2018.28}, URN = {urn:nbn:de:0030-drops-87412}, doi = {10.4230/LIPIcs.SoCG.2018.28}, annote = {Keywords: Contact dimension, Sphericity, Closest Pair, Fine-Grained Complexity} }
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