Jan Ambjørn
Professor, emeritus
Theoretical high energy, astroparticle and gravitational physics
Blegdamsvej 17
2100 København Ø
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Quantum Geometry
Ambjørn, Jan, 1999, Geometry in Present Day Science. p. 1-20Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication
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Critical phenomena in causal dynamical triangulations
Ambjørn, Jan, Coumbe, D., Gizbert-Studnicki, J., Gorlich, A. & Jurkiewicz, J., 15 Oct 2019, In: Classical and Quantum Gravity. 36, 22, 40 p., 224001.Research output: Contribution to journal › Journal article › Research › peer-review
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Reconstructing the universe
Ambjørn, Jan, Jurkiewicz, J. & Loll, R., 22 Sep 2005, In: Physical Review D (Particles, Fields, Gravitation and Cosmology). 72, 6, p. 064014Research output: Contribution to journal › Journal article › Research › peer-review
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The factorization method for Monte Carlo simulations of systems with a complex action
Ambjørn, Jan, Anagnostopoulos, K. N., Nishimura, J. & Verbaarschot, J. J. M., 29 Apr 2004, In: Nuclear physics B, Proceedings supplements. 129, p. 530-532Research output: Contribution to journal › Conference article › Research › peer-review
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An intergrable model with non-reducible three partical R- matrix
Ambjørn, Jan, Khachatryan, S. & Sedrakyan, A., 2004, In: Journal of Physics A: Mathematical and Theoretical (Print Edition). 37, 30, p. 7397-7406Research output: Contribution to journal › Journal article › Research › peer-review
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On the spontaneous breakdown of Lorentz symmetry in matrix models of superstrings
Ambjørn, Jan, Anagnostopoulos, K. N. & Nishimura, J., 15 Apr 2002, In: Physical Review D (Particles, Fields, Gravitation and Cosmology). 65, 8 part b, p. 086001Research output: Contribution to journal › Journal article › Research › peer-review
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Computer simulations of 3d Lorentzian quantum gravity
Ambjørn, Jan, Jurkiewicz, J. & Loll, R., 29 Apr 2001, In: Nuclear Physics, Section B, Proceedings Supplements. 94, p. 689-692Research output: Contribution to journal › Conference article › Research › peer-review
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Intrinsic geometric structure of c = -2 quantum gravity.
Ambjørn, Jan, Anagnostopoulos, K. N., Ichihara, T., Jensen, L., Kawamoto, N., Watabiki, Y. & Yotsuji, K., 1 Apr 1998, In: Nuclear physics B, Proceedings supplements. 63, p. 748-750Research output: Contribution to journal › Journal article › Research
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U(1) lattice gauge theory and N=2 supersymmetric Yang-Mills theory
Ambjørn, Jan, Sasakura, N. & Espriu, D., 20 Nov 1997, In: Modern Physics Letters A. 12, 35, p. 2665-2681Research output: Contribution to journal › Journal article › Research › peer-review
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Computational ergodicity in simplicial quantum gravity
Ambjørn, Jan & Jurkiewicz, J., 1 Apr 1995, In: Physics Letters B. Supplement 42, p. 704-706Research output: Contribution to journal › Journal article › Research
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2D quantum gravity coupled to renormalizable matter fields
Ambjørn, Jan & Ghoroku, K., 30 Dec 1994, In: International Journal of Modern Physics A. 9, 32, p. 5689-5709Research output: Contribution to journal › Journal article › Research
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Generalized penner models to all genera
Ambjørn, Jan, Kristjansen, Charlotte Fløe & Makeenko, Y., 15 Oct 1994, In: Physical Review D. 50, 8, p. 5193-5203Research output: Contribution to journal › Journal article › Research › peer-review
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Level crossing for hot sphalerons
Ambjørn, Jan, Farakos, K., Hands, S., Koutsoumas, G. & Thorleifsson, G., 22 Aug 1994, In: Nuclear Physics B. 425, 1-2, p. 39-66Research output: Contribution to journal › Journal article › Research
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On the Exponential Bound in Four-Dimensional Simplicial Gravity
Ambjørn, Jan & Jurkiewicz, J., 8 Sep 1994, In: Physics Letters B. 335, 3-4, p. 355-358Research output: Contribution to journal › Journal article › Research
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Matter Fields with c>1 coupled to 2D gravity
Durhuus, Bergfinnur, Ambjørn, Jan, Jönsson, T. & Thorleifsson, G., 1993, In: Nuclear Physics B. 398, p. 568-592Research output: Contribution to journal › Journal article › Research › peer-review
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Dynamical triangulated fermionic surfaces
Ambjørn, Jan & Varsted, S., 28 Mar 1991, In: Physics Letters B. 257, 3-4, p. 305-312Research output: Contribution to journal › Journal article › Research › peer-review
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Spiky higher genus strings
Ambjørn, Jan, Bellini, A. & Johnston, D., 7 Sep 1991, In: Modern Physics Letters A. 6, 27, p. 2467-2474Research output: Contribution to journal › Journal article › Research › peer-review
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On spontaneous parity breaking in three-dimensional Gauge- Higgs systems
Ambjørn, Jan, Farakos, K. & Shaposhnikov, M. E., 30 Oct 1991, In: Modern Physics Letters A. 6, 33, p. 3099-3112Research output: Contribution to journal › Journal article › Research › peer-review
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Four-dimensional simplicial quantum gravity
Ambjørn, Jan & Jurkiewicz, J., 19 Mar 1992, In: Physics Letters B. 278, 1-2, p. 42-50Research output: Contribution to journal › Journal article › Research
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Simplified tetrahedron equations: Fermionic realization
Ambjørn, Jan, Khachatyan, S. & Sedrakyan, A., 6 Feb 2006, In: Nuclear Physics B. 734, 3, p. 287-303Research output: Contribution to journal › Journal article › Research › peer-review
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Summing over all topological in CDT string field theory
Ambjørn, Jan, Loll, R., Westra, W. & Zohren, S., 13 Jul 2009, In: Physics Letters B. 678, 2, p. 227-232 5 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Geometry of the quantum universe
Ambjørn, Jan, Görlich, A., Jurkiewicz, J. & Loll, R., 28 Jun 2010, In: Physics Letters B. 690, 4, p. 420-426 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Three-dimensional lattice gauge theory and strings
Ambjørn, Jan, Olesen, Poul & Peterson, C., 24 Sep 1984, In: Nuclear Physics B. 244, 1, p. 262-276Research output: Contribution to journal › Journal article › Research › peer-review
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Action principle of Bogoliubov coefficients
Ambjørn, Jan, Hughes, R. J. & Nielsen, N. K., 1 Oct 1983, In: Annals of Physics. 150, 1, p. 92-113Research output: Contribution to journal › Journal article › Research › peer-review
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A magnetic condensate solution of the classical electroweak theory
Ambjørn, Jan & Olesen, Poul, 9 Feb 1989, In: Physics Letters B. 218, 1, p. 67-71Research output: Contribution to journal › Journal article › Research › peer-review
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Kinematical numerical study of the crumpling transition in crystalline surfaces
Ambjørn, Jan, Durhuus, Bergfinnur & Jonsson, T., 17 Apr 1989, In: Nuclear Physics B. 316, 3, p. 526-558Research output: Contribution to journal › Journal article › Research › peer-review
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The SU(2) chiral model in an external field: A complex stochastic process on a non-abelian group
Ambjørn, Jan & Yang, S. K., 29 Sep 1986, In: Nuclear Physics B. 275, 1, p. 18-38Research output: Contribution to journal › Journal article › Research › peer-review
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String tensions for lattice gauge theories in 2 + 1 dimensions
Ambjørn, Jan, Hey, A. & Otto, S., 25 Oct 1982, In: Nuclear Physics B. 210, 3, p. 347-368Research output: Contribution to journal › Journal article › Research › peer-review
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Multiloop correlators for two-dimensional quantum gravity
Ambjørn, Jan, Juriekwcz, J. & Makeenko, Y. M., 29 Nov 1990, In: Physics Letters B. 251, 4, p. 517-524Research output: Contribution to journal › Journal article › Research › peer-review
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Canonical quantisation in non-Abelian background fields
Ambjørn, Jan & Hughes, R. J., 2 Feb 1983, In: Annals of Physics. 145, 2, p. 340-377Research output: Contribution to journal › Journal article › Research › peer-review
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Superconducting cosmic strings and W condensation
Ambjørn, Jan, Nielsen, N. K. & Olesen, Poul, 12 Dec 1988, In: Nuclear Physics B. 310, 3-4, p. 625-635Research output: Contribution to journal › Journal article › Research › peer-review
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TRIANGULATED RANDOM SURFACES AS A REPRESENTATION OF NON-CRITICAL STRINGS
Ambjørn, Jan, 1 Apr 1989, In: Acta Physica Polonica B. 20, 4, p. 313-320Research output: Contribution to journal › Journal article › Research › peer-review
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Remarks about c>1 and D>2
Ambjørn, Jan, 1 Mar 1994, In: Theoretical and Mathematical Physics. 98, 3, p. 219-226Research output: Contribution to journal › Journal article › Research › peer-review
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The measure in three dimensional Nambu-Goto string theory
Ambjørn, Jan & Sedrakyan, A., 3 Oct 1996, In: Physics Letters B. 386, 1-4, p. 99-105Research output: Contribution to journal › Journal article › Research › peer-review
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Renormalisation group flow in an exactly solvable model with fluctuating geometry
Ambjørn, Jan, Bialas, P. & Jurkiewicz, J., 27 Jun 1996, In: Physics Letters B. 379, 1-2, p. 93-98Research output: Contribution to journal › Journal article › Research › peer-review
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Bethe Ansatz and thermodynamic limit of affine quantum group invariant extensions of the t-J model
Ambjørn, Jan, Avakyan, A., Hakobyan, T. & Sedrakyan, A., 1 Nov 1999, In: Journal of Mathematical Physics. 40, 11, p. 5687-5701Research output: Contribution to journal › Journal article › Research › peer-review
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Baby universes revisited
Ambjørn, Jan, Barkley, J., Budd, T. & Loll, R., 30 Nov 2011, In: Physics Letters B. 706, 1, p. 86-89Research output: Contribution to journal › Journal article › Research › peer-review
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Nonperturbative quantum gravity
Ambjørn, Jan, Goerlich, A., zJukiewic, J. & Loll, R., 1 Oct 2012, In: Physics Reports. 519, 4-5, p. 127-210 3 p.Research output: Contribution to journal › Journal article › Research › peer-review
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New multicritical matrix models and multicritical 2d CDT
Ambjørn, Jan, Glaser, L., Gorlich, A. & Sato, Y., 30 May 2012, In: Physics Letters B. 712, 1-2, p. 109-114Research output: Contribution to journal › Journal article › Research › peer-review
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2d CDT is 2d Horava-Lifshitz quantum gravity
Ambjørn, Jan, Glaser, L., Sato, Y. & Watabiki, Y., 13 Mar 2013, In: Physics Letters B: Particle Physics, Nuclear Physics and Cosmology. 722, 1-3, p. 172-175Research output: Contribution to journal › Journal article › Research › peer-review
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A modified Friedmann equation
Ambjørn, Jan & Watabiki, Y., 28 Dec 2017, In: Modern Physics Letters A. 32, 40, 1750224.Research output: Contribution to journal › Journal article › Research › peer-review
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Characteristics of the new phase in CDT
Ambjørn, Jan, Gizbert-Studnicki, J., Gorlich, A., Jurkiewicz, J., Klitgaard, N. & Loll, R., 9 Mar 2017, In: European Physical Journal C. 77, 3, 152.Research output: Contribution to journal › Journal article › Research › peer-review
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Universality of 2d causal dynamical triangulations
Ambjørn, Jan & Ipsen, A. C., 9 Jul 2013, In: Physics Letters B. 724, 1-3, p. 150-154Research output: Contribution to journal › Journal article › Research › peer-review
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The XXZ Heisenberg model on random surfaces
Ambjørn, Jan & Sedrakyan, A., 21 Sep 2013, In: Nuclear Physics B. 874, 3, p. 877-888Research output: Contribution to journal › Journal article › Research › peer-review
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The large-scale structure of the universe from a modified Friedmann equation
Ambjørn, Jan & Watabiki, Y., 30 Apr 2023, In: Modern Physics Letters A. 38, 12n13, 14 p., 2350068.Research output: Contribution to journal › Journal article › Research › peer-review
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Is the present acceleration of the Universe caused by merging with other universes?
Ambjørn, Jan & Watabiki, Y., 2023, In: Journal of Cosmology and Astroparticle Physics. 2023, 12, 011.Research output: Contribution to journal › Journal article › Research › peer-review
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Renormalization group flow in CDT
Ambjørn, Jan, Goerlich, A., Jurkiewicz, J., Kreienbuehl, A. & Loll, R., 21 Aug 2014, In: Classical and Quantum Gravity. 31, 16, 165003.Research output: Contribution to journal › Journal article › Research › peer-review
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A MATRIX MODEL FOR HYPERGEOMETRIC HURWITZ NUMBERS
Ambjørn, Jan & Chekhov, L. O., 1 Dec 2014, In: Teoreticheskaya i Matematicheskaya Fizika. 181, 3, p. 1486-1498Research output: Contribution to journal › Journal article › Research › peer-review
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Towards a diagrammatic derivation of the Veneziano-Yankielowicz-Taylor superpotential
Ambjørn, Jan & Janik, R. A., 4 Sep 2003, In: Physics Letters B. 569, 1-2, p. 81-84Research output: Contribution to journal › Journal article › Research › peer-review
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3d Lorentzian, dynamically triangulated quantum gravity
Ambjørn, Jan, Jurkiewicz, J. & Loll, R., 28 May 2002, In: Nuclear physics B, Proceedings supplements. 106, p. 980-982Research output: Contribution to journal › Conference article › Research › peer-review
ID: 5868
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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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