Roman JackiwPub Date : 2019-10-09DOI: 10.1142/9789811210679_0001
S. Adler
{"title":"Recent Path Crossings with Roman and Anomalies","authors":"S. Adler","doi":"10.1142/9789811210679_0001","DOIUrl":"https://doi.org/10.1142/9789811210679_0001","url":null,"abstract":"I begin with an anecdote, and then discuss my recent work on anomalies in spin-$frac{3}{2}$ theories.","PeriodicalId":437053,"journal":{"name":"Roman Jackiw","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130936210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Roman JackiwPub Date : 2018-05-29DOI: 10.1142/9789811210679_0025
E. Witten
{"title":"A Note on Boundary Conditions in Euclidean Gravity","authors":"E. Witten","doi":"10.1142/9789811210679_0025","DOIUrl":"https://doi.org/10.1142/9789811210679_0025","url":null,"abstract":"We review what is known about boundary conditions in General Relativity on a spacetime of Euclidean signature. The obvious Dirichlet boundary condition, in which one specifies the boundary geometry, is actually not elliptic and in general does not lead to a well-defined perturbation theory. It is better-behaved if the extrinsic curvature of the boundary is suitably constrained, for instance if it is positive- or negative-definite. A different boundary condition, in which one specifies the conformal geometry of the boundary and the trace of the extrinsic curvature, is elliptic and always leads formally to a satisfactory perturbation theory. These facts might have interesting implications for semiclassical approaches to quantum gravity. April, 2018","PeriodicalId":437053,"journal":{"name":"Roman Jackiw","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114254842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}