Contents - Max-Planck-Institut für Physik komplexer Systeme
Contents - Max-Planck-Institut für Physik komplexer Systeme
Contents - Max-Planck-Institut für Physik komplexer Systeme
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forinviteesandtherestoftheparticipants. Itssuccesswaslargelyduetotheeffortofallparticipants<br />
to communicate their research in ways that were both clear and attractive to their peers in other<br />
disciplines. Avoidingatootechnicalapproachtoissuesindifferentfieldsgaveusasarewardabroad<br />
pictureofhowuniversalevolutionarymechanismsare,andofhowdeeplytheyeffectourunderstanding<br />
oftheemergenceoforganizationandcomplexity.Hopefully,themeetingrepresentedalaunchingpadto<br />
developunifiedviewsofevolutionandadaptation,frominorganicchemistrytocomplexhumanbehaviour.<br />
ExploringComplexDynamicsinHigh-DimensionalChaoticSystems,Workshop<br />
Scientificcoordinators:J.M.López,A.Politi,A.Pikovsky<br />
ThemainfocusoftheWorkshopwastostudyforecastingtoolsforhighdimensionalchaoticsystems.<br />
Thereareanumberofwell-knownapproachestotacklethisprobleminlowdimensionalsystems,but<br />
makingusefulforecastsbecomestremendouslydifficultasthenumberofdegreesoffreedomincreases.<br />
TheWorkshopanalyzedtwocomplementaryapproachestopredictinghighlycomplexsystems.Ontheone<br />
hand,thedynamical-systemapproach,thatisbasedonconceptssuchasunstableandstablemanifolds,<br />
Lyapunovvectorsandexponents,chaoticattractors,etcareexploitedtoforecastthefuture.Ontheother<br />
hand,theoptimization/controltheoryapproach,which,startingfromtheknowledgeofpasttimeseries,<br />
isbasedontheimplementationofstatisticaltoolsliketheensembleKalmanfilter,dataassimilation,<br />
Bayesianestimations,etc.Acommonproblemineitherapproachishowtodealwiththefactthatour<br />
observationsdonotcoincidewiththepredictedtrajectoryandhowtousetheinformationfromnew<br />
observationstoimprovetheperformanceofthepredictionalgorithmforthenexttimewindow. During<br />
theWorkshopithasbecomeclearthattheunavoidableinaccuraciesofthemathematicalmodels(think<br />
oftheoceanflowandweathermodelapplications)limittheperformanceofanyapproachbasedsolely<br />
ondynamical-systemtheory. Atthesametime,knowledgeofthesystemdynamics(possiblyinthe<br />
presenceofnoise)isessentialfortheconstructionofensemblesoftrajectoriesandtherebytomake<br />
optimalpredictions.<br />
ThemostappreciatedaspectoftheWorkshophasbeentheopportunityofferedtoeachparticipantof<br />
fruitfullyinteractingwithmembersofdifferentcommunities: nonlineardynamicalsystems,statistical<br />
mechanics, weather forecasts, and oceanic flows. Moreover, the whole range from fundamental<br />
theoreticalproblemsthroughtoymodelsuptoparticularappliedimplementationshasbeencovered.As<br />
aresult,profitableexchangesofideastookplaceduringtheoralpresentationsatquestiontime(more<br />
thanforaverageWorkshops),andduringthetwopostersessions. Quiteremarkablewasalsothelively<br />
discussionduringtheRoundTable,whenthedifferentmethodsadoptedbytheEuropeanandAmerican<br />
forecastingcentersweremutuallycompared. Finally,thefriendlyenvironmentatthe mpipks<strong>Institut</strong>e<br />
contributedtoextendthediscussionsatallaspects,andtotriggernewscientificcollaborations.<br />
QuantumGravity,Workshop<br />
Scientificcoordinators:B.Dittrich,R.Schützhold<br />
Thisfocusworkshopconcentratedonthesubjectofquantumgravity. Therearevariousapproachesto<br />
quantumgravity.Duetoseveredifficulties,rangingfromtheoperationaltotheconceptual,noneofthem<br />
hasledsofartoacompletelysatisfactorytheory.Theseproblemsrelatehowevertothesamesetofissues<br />
comingindifferentdisguisesinthedifferentapproaches. Itisthereforeimportanttobringtheexperts<br />
fromdifferentapproachestogether,tofosterdiscussionsandsearchforthebesttechniquesamongall<br />
theavailableapproachesinordertomakeprogressontheseproblems.Themainaimofthisworkshops<br />
wasthereforetobringquantumgravityresearchersfromdifferentgroupstogether,inparticularfrom<br />
newlyestablishedonesinGermany. Thespeakerscoveredmanygroups,forinstanceAstridEichhorn<br />
(Jena),ChristianFleischhack(Paderborn),DominicoGuilini(Hannover),SamoJordan(Utrecht),Claus<br />
Kiefer(Köln),ClausLammerzahl(Bremen),CatherineMeusburger(EmmyNoetherGroup,Hamburg),<br />
DanieleOriti(AEI,Potsdam),FrankSaueressig(EmmyNoetherGroup,Mainz),MartinReuter(Mainz),<br />
andthethemaincurrentapproachestoquantumgravity,amongthemloopquantumgravity,spinfoams,<br />
groupfieldtheory,asymptoticsafety,causaldynamicaltriangulations,quantumgravityphenomenology,<br />
cosmologicalimprintsofquantumgravityandanaloguemodelsforquantumgravity. Theworkshop<br />
featuredanumberofoverviewtalkstypicallydeliveredbytheyoungerresearchesineachfield,forinstance<br />
onloopquantumgravity(JohannesBrunnemann),asymptoticsafety(FrankSaueressig),cosmology<br />
(GianlucaCalcagni),groupfieldtheory(DanieleOriti),causaldynamicaltriangulations(SamoJordan)<br />
andanaloguemodels(LorenzoSindoni). Thesewereverymuchappreciatedbothbytheyoungerand<br />
WorkshopReports 131
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