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1、Completetrailsofco-authorshipnetworkevolutionDeokjaeLee,1K.-I.Goh,2,∗B.Kahng,1,3,†andD.Kim11DepartmentofPhysicsandAstronomy,SeoulNationalUniversity,Seoul151-747,Korea2DepartmentofPhysics,KoreaUniversity,Seoul136-713,Korea3SchoolofPhysics,KoreaInstituteforAdvancedStudy,
2、Seoul130-722,Korea(Dated:September1,2010)Theriseandfallofaresearchfieldisthecumulativeoutcomeofitsintrinsicscientificvalueandsocialcoordinationamongscientists.Thestructureofthesocialcomponentisquantifiablebythesocialnetworkofresearcherslinkedviaco-authorshiprelations,whic
3、hcanbetrackedthroughdigitalrecords.Here,weusesuchco-authorshipdataintheoreticalphysicsandstudytheircompleteevolutionarytrailsinceinception,withaparticularemphasisontheearlytransientstages.Wefindthattheco-authorshipnetworksevolvethroughthreecommonmajorprocessesintime:the
4、nucleationofsmallisolatedcomponents,theformationofatree-likegiantcomponentthroughclusteraggregation,andtheentanglementofthenetworkbylarge-scaleloops.Thegiantcomponentisconstantlychangingyetrobustuponlinkdegradations,formingthenetwork'sdynamiccore.Theobservedpatternsare
5、successfullyreproduciblethroughanewnetworkmodel.PACSnumbers:89.75.Hc,89.75.Fb,89.65.-sI.INTRODUCTIONDecember2008.Theco-authorshipnetworkwasconstructedeachmonthfromthepaperspublisheduptothatmonth[15].Atthebrinkofthetwenty-firstcentury,twopapersherald-Thisnetworkisagrowin
6、g,weightednetwork.Withthedata,ingthebeginningofanewscienceofnetwork,whichwerewehaveperformedadetailedtemporalanalysisoftheevo-forthesmall-worldandthescale-freenetworks[1,2],werelutionofthelarge-scalestructureofthenetworkanddiscusspublished.Sincethen,complexnetworkresea
7、rch(CNR)hasitssocialimplications.Weparticularlyemphasizetheearlyflourished,notonlyasanactiveresearchfieldbutalsoasastageofevolution,whichhasnotbeenaddressedinpreviouscommonstructuralanalyticframeworkbywhichthesystemsstudies[16,17].approachtovariouscomplexsystemsinthenatu
8、ral,social,andinformationsciencescanpotentiallybeunified[3–7].Ourfine-scaletemporalanalysisinSecs.II–IVrevealsaAlongwit
