Sigbjørn Hervik

Sigbjørn Hervik (2024) Left-invariant pseudo-Riemannian metrics on Lie groups: The null cone. I: Differential geometry and its applications. ISSN 0926-2245. Volum 97. DOI: 10.1016/j.difgeo.2024.102205

David Duncan McNutt; Sigbjørn Hervik; Eivind Evenstad Dahl (2022) Building new Einstein spaces by deforming symmetric Einstein spaces. I: Irina Markina; Sigbjørn Hervik; Dennis The; Boris Kruglikov, Geometry, Lie Theory and Applications: The Abel Symposium 2019. Springer. ISBN 9783030812959. s.223-252. DOI: 10.1007/978-3-030-81296-6_11

Ben David Normann; Angelo Ricciardone; Sigbjørn Hervik; Mikjel Thorsrud (2022) A study of inhomogeneous massless scalar gauge fields in cosmology. I: International Journal of Modern Physics, Conference Series. ISSN 2010-1945. s.1378-1883. DOI: 10.1142/9789811258251_0199

Enrico Barausse; Emanuele Berti; Thomas Hertog; Scott A. Hughes; Philippe Jetzer; Paolo Pani; Sigbjørn Hervik; Helena Kolesova; Paolo Marcoccia; Germano Nardini; Alex Bentley Nielsen; Thomas P. Sotiriou; Nicola Tamanini; Helvi Witek; Kent Yagi; Nicolás Yunes; T. Abdelsahin; A. Achucarro; K. van Aelst; N. Afshordi; S. Akcay; L. Annulli; K.G. Arun; I. Ayuso; V. Baibhav; T. Baker; H. Bantilan; T. Barreiro; C. Barrera-Hinojosa; N. Bartolo; D. Baumann; E. Belgacem; E. Bellini; N. Bellomo; I. Ben-Dayan; I. Bena; R. Benkel; E. Bergshoefs; L. Bernard; S. Bernuzzi; D. Bertacca; M. Besancon; F. Beutler; F. Beyer; S. Bhagwat; J. Bicak; S. Biondini; S. Bize; D. Blas; C. Boehmer (2020) Prospects for fundamental physics with LISA. I: General Relativity and Gravitation. ISSN 0001-7701. Volum 52. DOI: 10.1007/s10714-020-02691-1

Ben David Normann; Sigbjørn Hervik (2020) Approaching Wonderland. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 37. s.1-47. DOI: 10.1088/1361-6382/ab719b

Sigbjørn Hervik; Marcello Ortaggio (2020) Universal p-form black holes in generalized theories of gravity. I: European Physical Journal C. ISSN 1434-6044. Volum 80. DOI: 10.1140/epjc/s10052-020-08571-x

Sigbjørn Hervik; Marcello Ortaggio (2020) On Universal Black Holes. I: Acta Physica Polonica B, Proceedings Supplement. ISSN 1899-2358. Volum 13. s.291-295. DOI: 10.5506/APhysPolBSupp.13.291

Sigbjørn Hervik; Marcello Ortaggio (2020) Universal Black Holes. I: Journal of High Energy Physics (JHEP). ISSN 1126-6708. DOI: 10.1007/JHEP02(2020)047

Ben David Normann; Sigbjørn Hervik (2020) Collins in Wonderland. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 37. DOI: 10.1088/1361-6382/ab8be7

Sigbjørn Hervik; David Duncan McNutt (2019) Locally Homogeneous Kundt Triples and CSI Metrics. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 36. s.185013-185013. DOI: 10.1088/1361-6382/ab3296

David Duncan McNutt; Lode Wylleman; Alan Coley; Sigbjørn Hervik (2019) Locally Boost Isotropic Spacetimes and the Type ${\bf D}^k$ Condition. I: arXiv.org. ISSN 2331-8422.

Christer Helleland; Sigbjørn Hervik (2019) Real GIT with applications to compatible representations and Wick-rotations. I: Journal of Geometry and Physics. ISSN 0393-0440. Volum 142. s.92-110. DOI: 10.1016/j.geomphys.2019.03.007

Ben David Normann; Sigbjørn Hervik; Angelo Ricciardone; Mikjel Thorsrud (2018) Bianchi cosmologies with p-form gauge fields. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 35. DOI: 10.1088/1361-6382/aab3a7

Sigbjørn Hervik (2018) On a new class of infinitesimal group actions on pseudo-Riemannian manifolds. I: arXiv.org. ISSN 2331-8422.

Sigbjørn Hervik; Tomas Malek (2018) Universal Walker metrics. I: Physica Scripta. ISSN 0031-8949. Volum 93. s.1-12. DOI: 10.1088/1402-4896/aace9c

Sigbjørn Hervik; Marcello Ortaggio; Vojtech Pravda (2018) Universal electromagnetic fields. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 35. s.1-19. DOI: 10.1088/1361-6382/aad13d

Sigbjørn Hervik; Vojtech Pravda; Alena Pravdova (2017) Universal spacetimes in four dimensions. I: Journal of High Energy Physics (JHEP). ISSN 1126-6708. Volum 2017. DOI: 10.1007/JHEP10(2017)028

Christer Helleland; Sigbjørn Hervik (2017) A Wick-rotatable metric is purely electric. I: Journal of Geometry and Physics. ISSN 0393-0440. Volum 123. s.424-429. DOI: 10.1016/j.geomphys.2017.09.015

Christer Helleland; Sigbjørn Hervik (2017) Wick rotations and real GIT. I: Journal of Geometry and Physics. ISSN 0393-0440. Volum 123. s.343-361. DOI: 10.1016/j.geomphys.2017.09.009

Øyvind Weiby Gregersen; Geir Øivind Kløkstad; Sigbjørn Hervik; Hans Ekkehard Plesser; Ivar Pettersen (2017) Some factors affecting the grades of technology students. I: Nordic Journal of STEM Education. Online ISSN 2535-4574. Volum 1. s.167-173.

Sigbjørn Hervik; Vojtech Pravda; Alena Pravdova (2015) Type N universal spacetime. I: Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. Volum 600. DOI: 10.1088/1742-6596/600/1/012065

Sigbjørn Hervik; Vojtech Pravda; Alena Pravdova (2015) Type III and II universal spacetimes. I: Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. Volum 600:012066. DOI: 10.1088/1742-6596/600/1/012066

Dmitry Shogin; Sigbjørn Hervik (2015) Dynamics of tilted Bianchi models of types III, IV, V in presence of diffusion. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 32. DOI: 10.1088/0264-9381/32/5/055008

Sigbjørn Hervik; Anders Haarr; Kei Yamamoto (2015) I-degenerate pseudo-Riemannian metrics. I: Journal of Geometry and Physics. ISSN 0393-0440. Volum 98. s.384-399. DOI: 10.1016/j.geomphys.2015.08.019

Dmitry Shogin; Per Amund Amundsen; Sigbjørn Hervik (2015) On the viability of the truncated Israel–Stewart theory in cosmology. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 32. s.1-14. DOI: 10.1088/0264-9381/32/19/195012

Sigbjørn Hervik; Tomas Malek; Vojtech Pravda; Alena Pravdova (2015) Type II universal spacetimes. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 32. DOI: 10.1088/0264-9381/32/24/245012

Alan Coley; Sigbjørn Hervik; David McNutt; Nathan Musoke; Dario Brooks (2014) Neutral signature Walker-VSI metrics. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 31. DOI: 10.1088/0264-9381/31/3/035015

Sigbjørn Hervik; Marcello Ortaggio; Lode Wylleman (2014) Electric and magnetic Weyl tensors in higher dimensions. I: Springer Proceedings in Physics. ISSN 0930-8989. Volum 157. s.287-290. DOI: 10.1007/978-3-319-06761-2_38

Dmitry Shogin; Sigbjørn Hervik (2014) The late-time behaviour of tilted Bianchi type VIII universes in presence of diffusion. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 31. DOI: 10.1088/0264-9381/31/13/135006

Sigbjørn Hervik; Vojtech Pravda; Alena Pravdova (2014) Type III and N universal spacetimes. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 31. DOI: 10.1088/0264-9381/31/21/215005

Metin Gurses; Sigbjørn Hervik; Tahsin Sisman; Bayram Tekin (2013) Anti–de Sitter–wave solutions of higher derivative Theories. I: Physical Review Letters. ISSN 0031-9007. Volum 111. DOI: 10.1103/PhysRevLett.111.101101

Dmitry Shogin; Sigbjørn Hervik (2013) Evolution of a simple inhomogeneous anisotropic cosmological model with diffusion. I: Journal of Cosmology and Astroparticle Physics (JCAP). Online ISSN 1475-7516. Volum 2013. DOI: 10.1088/1475-7516/2013/10/005

Sigbjørn Hervik; Marcello Ortaggio; Lode Wylleman (2013) Minimal tensors and purely electric or magnetic spacetimes of arbitrary dimension. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 30. DOI: 10.1088/0264-9381/30/16/165014

Sigbjørn Hervik (2012) Pseudo-Riemannian VSI spaces II. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 29. DOI: 10.1088/0264-9381/29/9/095011

Alan Coley; Sigbjørn Hervik; Marcello Ortaggio; Lode Wylleman (2012) Refinements of the Weyl tensor classification in five dimensions. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 29. DOI: 10.1088/0264-9381/29/15/155016

Mikjel Thorsrud; David Mota; Sigbjørn Hervik (2012) Cosmology of a scalar field coupled to matter and an isotropy-violating Maxwell field. I: Journal of High Energy Physics (JHEP). ISSN 1126-6708. DOI: 10.1007/JHEP10(2012)066

A Alcolado; A MacDougall; Alan Coley; Sigbjørn Hervik (2012) 4D neutral signature VSI and CSI spaces. I: Journal of Geometry and Physics. ISSN 0393-0440. Volum 62. s.594-603. DOI: 10.1016/j.geomphys.2011.04.012

Sigbjørn Hervik; Alan Coley (2011) Pseudo-Riemannian VSI spaces. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 28. s.15008-15008. DOI: 10.1088/0264-9381/28/1/015008

Sigbjørn Hervik (2011) All metrics have curvature tensors characterized by its invariants as a limit: the epsilon-property. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 28. DOI: 10.1088/0264-9381/28/15/157001

Sigbjørn Hervik; Alan Coley (2011) On the algebraic classification of pseudo-Riemannian spaces. I: International Journal of Geometric Methods in Modern Physics (IJGMMP). ISSN 0219-8878. Volum 8. s.1679-1685. DOI: 10.1142/S0219887811005932

Sigbjørn Hervik (2011) A spacetime not characterized by its invariants is of aligned type II. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 28. DOI: 10.1088/0264-9381/28/21/215009

Alan Coley; Sigbjørn Hervik; Mark Durkee; Mahdi Godazgar (2011) Algebraic classification of five-dimensional spacetimes using scalar invariants. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 28. DOI: 10.1088/0264-9381/28/15/155016

Sigbjørn Hervik; David Mota; Mikjel Thorsrud (2011) Inflation with stable anisotropic hair: is it cosmologically viable?. I: Journal of High Energy Physics (JHEP). ISSN 1126-6708. DOI: 10.1007/JHEP11(2011)146

Alan Coley; Sigbjørn Hervik (2011) Universality and Constant Scalar Curvature Invariants. I: ISRN Geometry. ISSN 2090-6307. DOI: 10.5402/2011/248615

Alan Coley; Sigbjørn Hervik (2011) Discriminating the Weyl type in higher dimensions using scalar curvature invariants. I: General Relativity and Gravitation. ISSN 0001-7701. Volum 43. s.2199-2207. DOI: 10.1007/s10714-011-1174-x

Alan Coley; Sigbjørn Hervik; Nicos Pelavas (2010) Lorentzian manifolds and scalar curvature invariants. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 27. DOI: 10.1088/0264-9381/27/10/102001

Sigbjørn Hervik; Woei Chet Lim; Patrik Sandin; Claes Uggla (2010) Future asymptotics of tilted Bianchi type II cosmologies. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 27. DOI: 10.1088/0264-9381/27/18/185006

John Barrow; Sigbjørn Hervik (2010) Simple types of anisotropic inflation. I: Physical Review D. Particles and fields. ISSN 0556-2821. Volum 81. DOI: 10.1103/PhysRevD.81.023513

Sigbjørn Hervik; Alan Coley (2010) Curvature operators and scalar curvature invariants. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 27. DOI: 10.1088/0264-9381/27/9/095014

Alan Coley; Sigbjørn Hervik (2010) Higher dimensional bivectors and classification of the Weyl operator. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 27. DOI: 10.1088/0264-9381/27/1/015002

A. Coley; Sigbjørn Hervik (2009) Note on the invariant classification of vacuum type D spacetimes. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 26. DOI: 10.1088/0264-9381/26/24/247001

Johan Brannlund; Alan Coley; Sigbjørn Hervik (2009) Holonomy, decomposability, and relativity(1). I: Canadian journal of physics (Print). ISSN 0008-4204. Volum 87. s.241-243. DOI: 10.1139/P08-092

Alan Coley; Andrea Fuster; Sigbjørn Hervik (2009) SUPERGRAVITY SOLUTIONS WITH CONSTANT SCALAR INVARIANTS. I: International Journal of Modern Physics A. ISSN 0217-751X. Volum 24. s.1119-1133.

Alan Coley; Sigbjørn Hervik; Nicos Pelavas (2009) Spacetimes characterized by their scalar curvature invariants. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 26. DOI: 10.1088/0264-9381/26/2/025013

Alan Coley; Sigbjørn Hervik; Woei Chet Lim; Malcolm MacCallum (2009) Properties of kinematic singularities. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 26. DOI: 10.1088/0264-9381/26/21/215008

Alan Coley; Sigbjørn Hervik; Nicos Pelavas (2009) Lorentzian spacetimes with constant curvature invariants in four dimensions. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 26. DOI: 10.1088/0264-9381/26/12/125011

Alan Coley; Sigbjørn Hervik; G. Papadopoulos; Nicos Pelavas (2009) Kundt spacetimes. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 26. DOI: 10.1088/0264-9381/26/10/105016

Johan Brannlund; Alan Coley; Sigbjørn Hervik (2008) Supersymmetry, holonomy and Kundt spacetimes. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 25. DOI: 10.1088/0264-9381/25/19/195007

Alan Coley; Gary Gibbons; Sigbjørn Hervik; C.N. Pope (2008) Metrics with vanishing quantum corrections. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 25. DOI: 10.1088/0264-9381/25/14/145017

Alan Coley; Sigbjørn Hervik (2008) A note on tilted Bianchi type VIh models: the type III bifurcation. I: Classical and Quantum Gravity. ISSN 0264-9381. Volum 25. DOI: 10.1088/0264-9381/25/19/198001

Sigbjørn Hervik; Boris Kruglikov; Irina Markina; Dennis The (2022) Geometry, Lie Theory and Applications: The Abel Symposium 2019. Springer. ISBN 9783030812959.

Sigbjørn Hervik; Boris Kruglikov; Irina Markina; Dennis The (2022) Geometry, Lie Theory and Applications: The Abel Symposium 2019. Springer. ISBN 9783030812959. DOI: 10.1007/978-3-030-81296-6

Nils Ivar Agøy; Sigbjørn Hervik; Kåre Letrud; Ingeborg Sophie Ribu; Ola Teige; Annelin Seppola; Dag Einar Thorsen; Tina Åsgård (2025) NTL og de andre.

Sigbjørn Hervik (2025) Big Bang - Universets skapelse og utvikling. Astronomisk Aften; 2025-10-21.

Sigbjørn Hervik (2025) Symmetry and Groups: Theory and Applications. 2025 MSP-Caraga Annual Convention Academic Sessions and Workshop; 2025-09-26 - 2025-09-27.

Iben Skartveit; Sigbjørn Hervik (2024) Ta vare på realfagsheltene!.

Sigbjørn Hervik (2024) Our Mathematical Universe: Gravity, Symmetry and Dynamical Systems. International Convergence: A Global Forum for Mathematics and Physics; 2024-10-24 - 2024-10-25.

Eirik Eik Svanes; Sigbjørn Hervik (2024) Introduksjon til kvantemekanikk. Forberedelse til Fysikk OL for VGS elever; 2024-07-11 - 2024-07-13.

Anders Tranberg; Sigbjørn Hervik; Edmund Copeland (2024) Wonderful World: Dark Energy (moderator). Wonderful World Festival, 2024; 2024-06-01.

Anders Tranberg; Sigbjørn Hervik; Ingunn Kathrine Wehus; Alex Bentley Nielsen (2023) Q&A - Generell relativitet og interstellar vitenskap. Wonderful World -nordisk festival for filosofi og vitenskap ; 2023-06-01.

Sigbjørn Hervik (2022) On spaces having identical polynomial curvature invariants.. Norsk Matematikermøte 2022; 2022-09-01 - 2022-09-02.

Sigbjørn Hervik (2018) On spaces having identical polynomial curvature invariants. Geometry and Relativity; 2018-11-15.

Sigbjørn Hervik (2016) Wick rotations and Holomorphic Riemannian geometry. Geometry and Lie theory; 2016-11-03 - 2016-11-04.

Sigbjørn Hervik (2015) Differensialligninger. RFK fagdag for VGS; 2015-11-13.

Sigbjørn Hervik (2014) Følger, rekker og diskret matematikk. Åpen Fagdag RFK; 2014-11-07.

Sigbjørn Hervik (2014) Abelprisen 2014. Abelprisen 2014; 2014-05-21.

Sigbjørn Hervik (2014) Partikkelfysikk. Gjesteforelesning; 2014-11-12.

Sigbjørn Hervik (2014) The Universe -- Cracking the code. Passwords 14; 2014-12-08 - 2014-12-10.

Sigbjørn Hervik (2012) Nobelprisen i Fysikk 2011. NTVA - seminarer; 2012-02-09.

Sigbjørn Hervik (2011) Herfra til Uendeligheten. I: Script.