Jan Ambjørn
Professor, emeritus
Theoretical high energy, astroparticle and gravitational physics
Blegdamsvej 17
2100 København Ø
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Scalar fields in causal dynamical triangulations
Ambjørn, Jan, Drogosz, Z., Gizbert-Studnicki, J., Görlich, A., Jurkiewicz, J. & Nemeth, D., 16 Sep 2021, In: Classical and Quantum Gravity. 38, 60 p., 195030.Research output: Contribution to journal › Journal article › Research › peer-review
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Geodesic distances in Liouville quantum gravity
Ambjørn, Jan & Budd, T. G., 1 Dec 2014, In: Nuclear Physics, Section B. 889, p. 676-691Research output: Contribution to journal › Journal article › Research › peer-review
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Wilson loops in nonperturbative quantum gravity
Ambjørn, Jan, Gorlich, A., Jurkiewicz, J. & Loll, R., 7 Jul 2015, In: Physical Review D (Particles, Fields, Gravitation and Cosmology). 92, 2, 024013.Research output: Contribution to journal › Journal article › Research › peer-review
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Four-dimensional dynamically triangulated gravity coupled to matter
Ambjørn, Jan, BURDA, Z., JURKIEWICZ, J. & Kristjansen, Charlotte Fløe, 15 Oct 1993, In: Physical Review D. 48, 8, p. 3695-3703Research output: Contribution to journal › Journal article › Research › peer-review
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Towards an UV fixed point in CDT gravity
Ambjørn, Jan, Gizbert-Studnicki, J., Gorlich, A., Jurkiewicz, J. & Nemeth, D., 29 Jul 2019, In: Journal of High Energy Physics. 2019, 7, 18 p., 166.Research output: Contribution to journal › Journal article › Research › peer-review
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Semiclassical universe from first principles
Ambjørn, Jan, Jurkiewicz, J. & Loll, R., 10 Feb 2005, In: Physics Letters B. 607, 3-4, p. 205-213Research output: Contribution to journal › Journal article › Research › peer-review
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Wilson loops in 2D noncommutative euclidean gauge theory 1. Perturbative expansion
Ambjørn, Jan, Dubin, A. & Makeenko, Y., 1 Jul 2004, In: Journal of High Energy Physics (Online). 2004, 7, p. 044Research output: Contribution to journal › Journal article › Research › peer-review
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Quantum rolling tachyon
Ambjørn, Jan & Janik, R. A., 23 Dec 2004, In: Physics Letters B. 604, 3-4, p. 225-234Research output: Contribution to journal › Journal article › Research › peer-review
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3-D lorentzian quantum gravity from the asymmetric ABAB matrix model
Ambjørn, Jan, Jurkiewicz, J., Loll, R. & Vernizzi, G., 2003, In: Acta Physica Polonica B. 34, 10, p. 4667-4688Research output: Contribution to journal › Journal article › Research › peer-review
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On the Quantum Geometry of String Theory
Ambjørn, Jan, Anagnostopoulos, K. N. & Nishimura, J., 28 May 2002, In: Nuclear Physics, Section B, Proceedings Supplements. 106, p. 965-967Research output: Contribution to journal › Conference article › Research › peer-review
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High Temperature, Classical, Real Time Dynamics of Nonabelian Gauge Theories as Seen by a Computer
Ambjørn, Jan & Anagnostopoulos, K. N., 2001, In: JHEP. 0106, p. 069Research output: Contribution to journal › Journal article › Research › peer-review
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Simulating simplified versions of the IKKT matrix model
Ambjørn, Jan, Anagnostopoulos, K. N., Hotta, T. & Nishimura, J., 29 Apr 2001, In: Nuclear Physics, Section B, Proceedings Supplements. 94, p. 685-688Research output: Contribution to journal › Conference article › Research › peer-review
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Nonperturbative Lorentzian path integral for gravity
Ambjørn, Jan, Jurkiewicz, J. & Loll, R., 31 Jul 2000, In: Physical Review Letters. 85, 5, p. 924-927Research output: Contribution to journal › Journal article › Research › peer-review
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Making the Gravitational Path Integral More Lorentzian, or Life Beyond Liouville Gravity
Ambjørn, Jan, Anagnostopoulos, K. N. & Loll, R., 1 Jun 2000, In: Nuclear physics B, Proceedings supplements. 88, p. 241-244Research output: Contribution to journal › Conference article › Research › peer-review
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Two-Dimensional Quantum Geometry
Ambjørn, Jan, Nielsen, J. L. & Rolf, J., 1999, In: Fortschr. Phys.. Vol. 47, p. 152-171Research output: Contribution to journal › Journal article › Research › peer-review
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U(1) Lattice Gauge Theory and N = 2 Supersymmetric Yang-Mills Theory
Ambjørn, Jan, Sasakura, N. & Espriu, D., 2 Jan 1999, In: Fortschritte der Physik. 47, 1-3, p. 287-292Research output: Contribution to journal › Journal article › Research › peer-review
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The NBI matrix model of IIB Superstrings
Ambjørn, Jan & Chekhov, L., 1 Dec 1998, In: Journal of High Energy Physics (Online). 1998, 12, p. 007Research output: Contribution to journal › Journal article › Research
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The fractal Structure of Space-Time
Ambjørn, Jan, 1997, Second International Sakharov Conference on Physics, Moscow, May 18.-25., 1996. Singapore, p. 235Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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Singularities of the Partition Function for the Ising Model coupled to 2-D Quantum Gravity
Ambjørn, Jan, Anagnostopoulos, K. N. & Magnea, U., 20 Jul 1997, In: Modern Physics Letters A. 12, 22, p. 1605-1628Research output: Contribution to journal › Journal article › Research
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Scaling with a modified Wilson action which suppresses Z(2) artifacts in SU(2) lattice gauge theories
Ambjørn, Jan & Thorleifsson, G., 1994, In: Phys. REv.. D 50, p. 4715-4717Research output: Contribution to journal › Journal article › Research
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The classical sphaleron transition rate exists and is equal to 1.1(awT)4
Ambjørn, Jan & Krasnitz, A., 9 Nov 1995, In: Physics Letters B. 362, 1-4, p. 97-104Research output: Contribution to journal › Journal article › Research
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Physics of c > 1 coupled to gravity
Ambjørn, Jan, 1995, In: Proc. of XXVIII International Symposium Ahrenshoop. p. 116-127Research output: Contribution to journal › Journal article › Research
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Problems in Quantum Gravity
Ambjørn, Jan, 1994, Proceedings of the Workshop on Strings, Topological Field Theory and Matrix Models. Moscow, p. 241-250Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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Barriers in Quantum Gravity
Ambjørn, Jan, 1994, String Theory, Gauge Theory and Quantum Gravity 93. Singapore: World Scientific, p. 228-238Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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Effective sampling of random surfaces by baby universe surgery
Ambjørn, Jan, Bialas, P., Burda, Z., Jurkiewicz, J. & Petersson, B., 21 Apr 1994, In: Physics Letters B. 325, 3-4, p. 337-346Research output: Contribution to journal › Journal article › Research
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Nonperturbative 2D quantum gravity and Hamiltonians unbounded from below
Ambjørn, Jan & Kristjansen, Charlotte Fløe, 20 Mar 1993, In: International Journal of Modern Physics A. 8, 7, p. 1259-1281Research output: Contribution to journal › Journal article › Research › peer-review
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Parity breaking at high temperature and density
Ambjørn, Jan, Farakos, K. & Shaposhnikov, M. E., 29 Mar 1993, In: Nuclear Physics B. 393, 3, p. 633-657Research output: Contribution to journal › Journal article › Research
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Asymptotic freon: An example on electroweak magnetism
Ambjørn, Jan & Olesen, Poul, 1990, In: Acta Physica Polonica B. 21, 2, p. 109-117Research output: Contribution to journal › Journal article › Research › peer-review
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Higher genus correlators from the hermitian one-matrix model
Ambjørn, Jan, Chekhov, L. & Makeenko, Y., 28 May 1992, In: Physics Letters B. 282, 3-4, p. 341-348Research output: Contribution to journal › Journal article › Research
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A matrix model for 2D quantum gravity defined by causal dynamical triangulations
Ambjørn, Jan, Loll, R., Watabiki, Y., Westra, W. & Zohren, S., 24 Jul 2008, In: Physics Letters B. 665, 4, p. 252-256 5 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Topology change in causal quantum gravity
Ambjørn, Jan, Loll, R., Watabiki, Y., Westra, W. & Zohren, S., 2008, Proceedings of 17th Workshop on General Relativity and Gravitattion in Japan: Nagoya, Japan, 3-7 Dec 2007. 4 p.Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research
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Planckian birth of a quantum de Sitter universe
Ambjørn, Jan, Goerlich, A., Jurkiewicz, J. & Loll, R., 7 Mar 2008, In: Physical Review Letters. 100, 9, p. 091304Research output: Contribution to journal › Journal article › Research › peer-review
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Sphaleron transition rate: recent numerical results
Ambjørn, Jan & Krasnitz, A., 1 Apr 1998, In: Nuclear physics B, Proceedings supplements. 63, p. 575-577Research output: Contribution to journal › Journal article › Research › peer-review
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Stochastic quantization and the role of time in quantum gravity
Ambjørn, Jan, Loll, R., Westra, W. & Zohren, S., 5 Oct 2009, In: Physics Letters B. 680, 4, p. 359-364 5 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Causal random geometry from stochastic quantization: XI Latin American Workshop on Nonlinear Phenomena
Ambjørn, Jan, Loll, R., Westra, W. & Zohren, S., 5 Apr 2010, In: Journal of Physics - Conference Series. 246, 1, p. 012028 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Properties of the vacuum. 2. Electrodynamic
Ambjørn, Jan & Wolfram, S., 15 Aug 1983, In: Annals of Physics. 147, 1, p. 33-56Research output: Contribution to journal › Journal article › Research › peer-review
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Fermionized spin systems and the boson-fermion mapping in (2+1)-dimensional gauge theory
Ambjørn, Jan & Semenoff, G. W., 3 Aug 1989, In: Physics Letters B. 226, 1-2, p. 107-112Research output: Contribution to journal › Journal article › Research › peer-review
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Anti-screening of large magnetic fields by vector bosons
Ambjørn, Jan & Olesen, Poul, 1 Dec 1988, In: Physics Letters B. 214, 4, p. 565-589Research output: Contribution to journal › Journal article › Research › peer-review
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Summing over all genera for d > 1: a toy model
Ambjørn, Jan, Durhuus, Bergfinnur & Jonsson, T., 26 Jul 1990, In: Physics Letters B. 244, 3-4, p. 403-412Research output: Contribution to journal › Journal article › Research › peer-review
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3-DIMENSIONAL SIMPLICIAL QUANTUM-GRAVITY COUPLED TO ISING MATTER
Ambjørn, Jan, Burda, Z., Jurkiewicz, J. & Kristjansen, Charlotte Fløe, 1 Mar 1993, In: Nuclear Physics B. Suppl. 30, p. 771-774Research output: Contribution to journal › Journal article › Research › peer-review
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A SOLVABLE 2D GRAVITY MODEL WITH ¿>0
Ambjørn, Jan, Durhuus, Bergfinnur & Jonsson, T., 30 Apr 1994, In: Modern Physics Letters A. 9, 13, p. 1221-1228Research output: Contribution to journal › Journal article › Research › peer-review
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Z2 GAUGE MATTER COUPLED TO 4-D SIMPLICIAL QUANTUM-GRAVITY
Ambjørn, Jan, Jurkiewicz, J., Blike, S., Burda, Z. & Petersson, T., 7 Sep 1994, In: Modern Physics Letters A. 9, 27, p. 2527-2541Research output: Contribution to journal › Journal article › Research › peer-review
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Nonperturbative dynamics of noncommutative gauge theory
Ambjørn, Jan, Makeenko, Y. M., Nishimura, J. & Szabo, R. J., 11 May 2000, In: Physics Letters B. 480, 3-4, p. 399-408Research output: Contribution to journal › Journal article › Research › peer-review
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Semi-classical dynamical triangulations
Ambjørn, Jan & Budd, T. G., 15 Nov 2012, In: Physics Letters B. 718, 1, p. 200-204 4 p.Research output: Contribution to journal › Journal article › Research › peer-review
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The transfer matrix in four-dimensional CDT
Ambjørn, Jan, Gizbert-Studnicki, J., Gorlich, A. T. & Jurkiewicz, J., 1 Sep 2012, In: Journal of High Energy Physics (Online). 2012, 9, p. 017Research output: Contribution to journal › Journal article › Research › peer-review
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Spectral curves for hypergeometric Hurwitz numbers
Ambjørn, Jan & Chekhov, L. O., 23 Jul 2018, In: Journal of Geometry and Physics. 132, p. 382-392 11 p.Research output: Contribution to journal › Journal article › Research › peer-review
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New higher-order transition in causal dynamical triangulations
Ambjørn, Jan, Coumbe, D., Gizbert-Studnicki, J., Gorlich, A. & Jurkiewicz, J., 16 Jun 2017, In: Physical Review D. 95, 12, 124029.Research output: Contribution to journal › Journal article › Research › peer-review
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Exploring the spectrum of regularized bosonic string theory
Ambjørn, Jan & Makeenko, Y., 1 Mar 2015, In: Journal of Experimental and Theoretical Physics. 120, 3, p. 470-476Research output: Contribution to journal › Journal article › Research › peer-review
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Renormalization in Quantum Theories of Geometry
Ambjørn, Jan, Gizbert-Studnicki, J., Gorlich, A., Jurkiewicz, J. & Loll, R., 9 Jul 2020, In: Frontiers in Physics. 8, 12 p., 247.Research output: Contribution to journal › Journal article › Research › peer-review
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Pseudo-Cartesian coordinates in a model of Causal Dynamical Triangulations
Ambjørn, Jan, Drogosz, Z., Gizbert-Studnicki, J., Gorlich, A. & Jurkiewicz, J., 30 Apr 2019, In: Nuclear Physics B. 943, 18 p., 114626.Research output: Contribution to journal › Journal article › Research › peer-review
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Signature change of the metric in CDT quantum gravity?
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A model for emergence of space and time
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String theory as a Lilliputian world
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