Bengtsson, Ingemar The Hawking energy on photon surfaces. (English) Zbl 1443.83018 Gen. Relativ. Gravitation 52, No. 5, Paper No. 52, 8 p. (2020). MSC: 83C40 83C22 83C05 53E10 53Z05 PDFBibTeX XMLCite \textit{I. Bengtsson}, Gen. Relativ. Gravitation 52, No. 5, Paper No. 52, 8 p. (2020; Zbl 1443.83018) Full Text: DOI arXiv
Bengtsson, Ingemar; Jakobsson, Emma A toy Penrose inequality and its proof. (English) Zbl 1370.83038 Gen. Relativ. Gravitation 48, No. 12, Article ID 156, 12 p. (2016). MSC: 83C57 53Z05 83C40 83C75 83C80 PDFBibTeX XMLCite \textit{I. Bengtsson} and \textit{E. Jakobsson}, Gen. Relativ. Gravitation 48, No. 12, Article ID 156, 12 p. (2016; Zbl 1370.83038) Full Text: DOI arXiv
Åman, Jan E.; Bengtsson, Ingemar; Rúnarsson, Helgi Freyr What are extremal Kerr Killing vectors up to? (English) Zbl 1266.83095 Classical Quantum Gravity 29, No. 21, Article ID 215017, 7 p. (2012). MSC: 83C57 83C40 53Z05 PDFBibTeX XMLCite \textit{J. E. Åman} et al., Classical Quantum Gravity 29, No. 21, Article ID 215017, 7 p. (2012; Zbl 1266.83095) Full Text: DOI arXiv
Bengtsson, Ingemar; Życzkowski, Karol Geometry of quantum states. An introduction to quantum entanglement. 1st paperback ed. (English) Zbl 1155.81002 Cambridge: Cambridge University Press (ISBN 978-0-521-89140-0/pbk). xii, 419 p. (2007). MSC: 81-01 47N50 53Cxx PDFBibTeX XMLCite \textit{I. Bengtsson} and \textit{K. Życzkowski}, Geometry of quantum states. An introduction to quantum entanglement. 1st paperback ed. Cambridge: Cambridge University Press (2007; Zbl 1155.81002) Full Text: DOI
Abramowicz, M. A.; Bengtsson, I.; Karas, V.; Rosquist, K. Poincaré ball embeddings of the optical geometry. (English) Zbl 1005.83018 Classical Quantum Gravity 19, No. 15, 3963-3976 (2002). Reviewer: Gabriel Teodor Pripoae (Bucureşti) MSC: 83C57 53Z05 PDFBibTeX XMLCite \textit{M. A. Abramowicz} et al., Classical Quantum Gravity 19, No. 15, 3963--3976 (2002; Zbl 1005.83018) Full Text: DOI arXiv
Bengtsson, Ingemar; Holst, Sören De Sitter space and spatial topology. (English) Zbl 0938.83026 Classical Quantum Gravity 16, No. 11, 3735-3748 (1999). MSC: 83F05 57M50 83C15 53C50 PDFBibTeX XMLCite \textit{I. Bengtsson} and \textit{S. Holst}, Classical Quantum Gravity 16, No. 11, 3735--3748 (1999; Zbl 0938.83026) Full Text: DOI arXiv
Åminneborg, Stefan; Bengtsson, Ingemar; Brill, Dieter; Holst, Sören Black holes and wormholes in \(2+1\) dimensions. (English) Zbl 0913.53041 Classical Quantum Gravity 15, No. 3, 627-644 (1998). MSC: 53Z05 83C57 83C75 PDFBibTeX XMLCite \textit{S. Åminneborg} et al., Classical Quantum Gravity 15, No. 3, 627--644 (1998; Zbl 0913.53041) Full Text: DOI arXiv
Bengtsson, I.; Jacobson, T. Degenerate metric phase boundaries. (English) Zbl 0892.53035 Classical Quantum Gravity 14, No. 11, 3109-3121 (1997); corrigendum ibid 15, No. 12, 3942 (1998). MSC: 53Z05 83C05 83C45 PDFBibTeX XMLCite \textit{I. Bengtsson} and \textit{T. Jacobson}, Classical Quantum Gravity 14, No. 11, 3109--3121 (1997; Zbl 0892.53035) Full Text: DOI arXiv
Åminneborg, Stefan; Bengtsson, Ingemar; Holst, Sören; Peldán, Peter Making anti-de Sitter black holes. (English) Zbl 0862.53065 Classical Quantum Gravity 13, No. 10, 2707-2714 (1996). MSC: 53Z05 83C57 PDFBibTeX XMLCite \textit{S. Åminneborg} et al., Classical Quantum Gravity 13, No. 10, 2707--2714 (1996; Zbl 0862.53065) Full Text: DOI arXiv
Bengtsson, Ingemar Neighbours of Einstein’s equations: Connections and curvatures. (English) Zbl 0849.53054 Gen. Relativ. Gravitation 28, No. 3, 347-363 (1996). MSC: 53Z05 83C05 PDFBibTeX XMLCite \textit{I. Bengtsson}, Gen. Relativ. Gravitation 28, No. 3, 347--363 (1996; Zbl 0849.53054) Full Text: DOI arXiv
Bengtsson, Ingemar Note on massive spin 2 in curved space. (English) Zbl 0841.53065 J. Math. Phys. 36, No. 10, 5805-5811 (1995). MSC: 53Z05 83C47 PDFBibTeX XMLCite \textit{I. Bengtsson}, J. Math. Phys. 36, No. 10, 5805--5811 (1995; Zbl 0841.53065) Full Text: DOI arXiv
Bengtsson, Ingemar 2-form geometry and the ’t Hooft-Plebanski action. (English) Zbl 0824.53025 Classical Quantum Gravity 12, No. 7, 1581-1590 (1995). MSC: 53C07 83C05 53C50 53A30 PDFBibTeX XMLCite \textit{I. Bengtsson}, Classical Quantum Gravity 12, No. 7, 1581--1590 (1995; Zbl 0824.53025) Full Text: DOI arXiv
Bengtsson, Ingemar Strange reality: Ashtekar’s variables with variations. (English. Russian original) Zbl 0850.53030 Theor. Math. Phys. 95, No. 2, 511-513 (1993); translation from Teor. Mat. Fiz. 95, No. 2, 211-213 (1993). MSC: 53Z05 83C45 PDFBibTeX XMLCite \textit{I. Bengtsson}, Theor. Math. Phys. 95, No. 2, 511--513 (1993; Zbl 0850.53030); translation from Teor. Mat. Fiz. 95, No. 2, 211--213 (1993) Full Text: DOI
Bengtsson, Ingemar Neighbours of Einstein’s equations — some new results. (English) Zbl 0782.53071 Classical Quantum Gravity 10, No. 9, 1791-1802 (1993). MSC: 53Z05 83C05 PDFBibTeX XMLCite \textit{I. Bengtsson}, Classical Quantum Gravity 10, No. 9, 1791--1802 (1993; Zbl 0782.53071) Full Text: DOI
Bengtsson, Ingemar Clifford algebra of two-forms, conformal structures, and field equations. (English) Zbl 0912.53055 Oziewicz, Zbigniew (ed.) et al., Spinors, twistors, Clifford algebras and quantum deformations. Proceedings of the 2nd Max Born symposium, Wrocław, Poland, September 24–27, 1992. Dordrecht: Kluwer Academic Publishers. Fundam. Theor. Phys. 52, 183-188 (1993). MSC: 53Z05 81T13 15A66 83C05 PDFBibTeX XMLCite \textit{I. Bengtsson}, Fundam. Theor. Phys. 52, 183--188 (1993; Zbl 0912.53055) Full Text: arXiv
Bengtsson, Ingemar Self-duality and the metric in a family of neighbors of Einstein’s equations. (English) Zbl 0741.53049 J. Math. Phys. 32, No. 11, 3158-3161 (1991). Reviewer: A.D.Osborne (Keele) MSC: 53Z05 53B50 PDFBibTeX XMLCite \textit{I. Bengtsson}, J. Math. Phys. 32, No. 11, 3158--3161 (1991; Zbl 0741.53049) Full Text: DOI
Bengtsson, Ingemar Degenerate metrics and an empty black hole. (English) Zbl 0739.53059 Classical Quantum Gravity 8, No. 10, 1847-1857 (1991). MSC: 53Z05 53C80 PDFBibTeX XMLCite \textit{I. Bengtsson}, Classical Quantum Gravity 8, No. 10, 1847--1857 (1991; Zbl 0739.53059) Full Text: DOI
Bengtsson, Ingemar Self-dual Yang-Mills fields and Ashtekar’s variables. (English) Zbl 0703.53076 Classical Quantum Gravity 7, No. 10, L223-L227 (1990). MSC: 53B50 81T13 53B30 PDFBibTeX XMLCite \textit{I. Bengtsson}, Classical Quantum Gravity 7, No. 10, L223--L227 (1990; Zbl 0703.53076) Full Text: DOI
Bengtsson, Ingemar A new phase for general relativity? (English) Zbl 0687.53068 Classical Quantum Gravity 7, No. 1, 27-39 (1990). Reviewer: C.H.Brans MSC: 53C80 83C05 PDFBibTeX XMLCite \textit{I. Bengtsson}, Classical Quantum Gravity 7, No. 1, 27--39 (1990; Zbl 0687.53068) Full Text: DOI