Jan Ambjørn
Professor, emeritus
Theoretical high energy, astroparticle and gravitational physics
Blegdamsvej 17
2100 København Ø
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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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W-condensate formation in high energy collisions
Ambjørn, Jan & Olesen, Poul, 21 Mar 1991, In: Physics Letters B. 257, 1-2, p. 201-206Research output: Contribution to journal › Journal article › Research › peer-review
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Lattice measurement of sphaleron transitions
Ambjørn, Jan, Askgaard, T., Porter, H. & Shaposhnikov, M. E., 1991, Lattice 90. Proc.Int.Conf. on Lattice Field Theory, Tallahassee, Florida. Amsterdam, p. 752-754Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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Spontaneous parity breaking of the electroweak theory in the early Universe..
Ambjørn, Jan & Farakos, K., 1992, Workshop on Electroweak symmetry breaking. Singapore, p. 435-441Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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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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Computer simulation of the bosonic string
Ambjørn, Jan, 1 Feb 1990, In: Acta Physica Polonica B. 21, 2, p. 101-107Research output: Contribution to journal › Journal article › Research › peer-review
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Electroweak Magnetism, W-condensation and Antiscreening
Ambjørn, Jan & Olesen, P., 1994, Proceedings of the 4th Hellenic School on Elementary Particle Physics. Athens: National Technical University Press, p. 396-407Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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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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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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Nonpertubative Dynamics of Noncommutative Gauge Theory
Ambjørn, Jan, Nishimura, J., Szabo, R. J. & Makeenko, Y. M., 2000, In: Phys. Lett.. B480, p. 399Research output: Contribution to journal › Journal article › Research › peer-review
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The Geometry of Dynamical Triangulations
Ambjørn, Jan, Carfora, M. & Marzuoli, A., 1997, Lecture Notes in Physics: N.s. M, Monographs 50. p. 197Research output: Chapter in Book/Report/Conference proceeding › Book chapter › 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 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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Entropy estimate in three-dimensional simplical quantum gravity
Ambjørn, Jan & Varsted, J., 29 Aug 1991, In: Physics Letters B. 266, 3-4, p. 285-290Research output: Contribution to journal › Journal article › Research › peer-review
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External field dependence in the SU(2) lattice theory
Ambjørn, Jan, Mitrjushkin, V. K. & Zadorozhny, A. M., 1990, In: Physics Letters B. 245, p. 575-580Research 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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Sphaleron transitions and Baryon asymmetry: A nummerical, real-time analysis
Ambjørn, Jan, Askgaard, T., Porter, H. & Shaposhnikov, M. E., 15 Apr 1991, In: Nuclear Physics B. 353, 2, p. 346-378Research output: Contribution to journal › Journal article › Research › peer-review
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Quantum Geometry, a statistical field theory approach
Ambjørn, Jan, Durhuus, Bergfinnur & Jonsson, T., 1997, Monographs in Matematical Physics. p. 371Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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The Quantum Spacetime Of c>0 2d Gravity
Ambjørn, Jan, Anagnostopoulos, K. N. & Thorleifsson, G., 1998, In: Nucl. Phys. B (Proc.Suppl.). 63, p. 742-744Research output: Contribution to journal › Journal article › Research
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2D gravity, random surfaces and all that
Ambjørn, Jan, 1991, Lattica 90. Proc.Int.Conf. Lattice Field Theory,Tallahassee, Florida. Amsterdam, p. 701-710Research 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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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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Three-dimensional Simplical Quantum Gravity Coupled to Ising Matter
Ambjørn, Jan, Burda, Z., Jurkiewicz, J. & Kristjansen, C., 1993, In: Nucl. Phys. B (Proc.Suppl.). 30, p. 771-774Research output: Contribution to journal › Journal article › Research
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Z*U2 Gauge Matter Coupled to 4d Simplicial Quantum Gravity
Ambjørn, Jan, Bilke, S., Burda, Z., Jurkiewicz, J. & Petersson, B., 1994, In: Mod. Phys. Lett.. A9, p. 2527-2533Research output: Contribution to journal › Journal article › Research
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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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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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Non-perturbative calculation of correlators in 2D quantum gravity
Ambjørn, Jan & Greensite, J., 17 Jan 1991, In: Physics Letters B. 254, 1-2, p. 66-70Research output: Contribution to journal › Journal article › Research › peer-review
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Spontaneous parity breaking in the early universe
Ambjørn, Jan & Farakos, K., 1992, In: Nuclear Physics B. 26, p. 533-535Research output: Contribution to journal › Journal article › Research
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Regularized quantum gravity and string theory
Ambjørn, Jan, 1992, Proc. on Random surfaces and 2-D quantum gravity, Barcelona, 1991... Amsterdam, p. 8-24Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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A new approach to three-dimensional quantum gravity..
Ambjørn, Jan & Varsted, S., 1992, Workshop on random surfaces and 2-D quantum gravity, Barcelona, 1991. Amsterdam, p. 25-30Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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Two obstacles in quantum gravity
Ambjørn, Jan, 1995, Proc. of the conference "Strings '93". p. 387-396Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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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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Noncritical String Field Theory for Two-D Quantum Gravity coupled to (p, q) Conformal Fields
Ambjørn, Jan & Watabiki, Y., 1997, In: Int. J. Mod. Phys.. A12, p. 4257-4289Research output: Contribution to journal › Journal article › Research
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Is the present acceleration of the Universe caused by merging with other universes?
Ambjørn, Jan & Watabiki, Y., 12 Dec 2023, In: Journal of Cosmology and Astroparticle Physics. 2023, 12, 20 p., 011.Research output: Contribution to journal › Journal article › Research › peer-review
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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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A solvable 2D gravity Model with Gamma greater than Zero
Ambjørn, Jan, Durhuus, Bergfinnur & Jónsson, T., 1994, In: Modern Physics Letters A. 9, p. 1221-1228Research output: Contribution to journal › Journal article › Research › peer-review
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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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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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New Monte Carlo simulations
Ambjørn, Jan, Boulatov, F. & Kazakov, V. A., 1990, In: Modern Physics Letters A. 5, p. 771-785Research output: Contribution to journal › Journal article › Research › peer-review
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Sphaleron-like transitions at high temperature
Ambjørn, Jan, 1995, Proc. of NATO Advanced Research Workshop on Electroweak Physics and the Early Universe. p. 271-286Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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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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Finite N matrix models of noncommutative gauge theory
Ambjørn, Jan, Makeenko, Y. M., Nishimura, J. & Szabo, R. J., 1 Nov 1999, In: Journal of High Energy Physics (Online). 1999, 11, p. 029Research output: Contribution to journal › Journal article › Research › peer-review
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Dynamical triangulations, a gateway to quantum gravity?
Ambjørn, Jan, Jurkiewicz, J. & Watabiki, Y., 1 Nov 1995, In: Journal of Mathematical Physics. 36, 11, p. 6299-6339Research output: Contribution to journal › Journal article › Research
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Shaken, but not stirred: Potts model coupled to quantum gravity
Ambjørn, Jan, Anagnostopoulos, K. N., Loll, R. & Pushkina, I., 21 Jan 2009, In: Nuclear Physics B. 807, 1-2, p. 251-264 19 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Stochastic quantization vs. KdV flows in two-dimensional quantum gravity
Ambjørn, Jan, Johnson, C. V. & Morris, T. R., 4 May 1992, In: Nuclear Physics B. 374, 3, p. 496-510Research output: Contribution to journal › Journal article › Research › peer-review
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Three-dimensional simplicial quantum gravity
Ambjørn, Jan & Varsted, S., 6 Apr 1992, In: Nuclear Physics B. 373, 2, p. 557-577Research output: Contribution to journal › Journal article › Research › peer-review
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Second-order phase transition in causal dynamical triangulations
Ambjørn, Jan, Jordan, S., Jurkiewicz, J. & Loll, R., 15 Nov 2011, In: Physical Review Letters. 107, 21, p. 211303Research output: Contribution to journal › Journal article › Research › peer-review
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Easing the Hubble constant tension
Ambjørn, Jan & Watabiki, Y., 1 Mar 2022, In: Modern Physics Letters A. 37, 07, 2250041.Research output: Contribution to journal › Journal article › Research › peer-review
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Nonperturbative 3d Lorentzian quantum gravity
Ambjørn, Jan, Jurkiewicz, J. & Loll, R., 15 Aug 2001, In: Physical Review D (Particles, Fields, Gravitation and Cosmology). 64, 4, p. 044011Research output: Contribution to journal › Journal article › Research › peer-review
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Recent progress in the theory of random surfaces and simplicial quantum gravity
Ambjørn, Jan, 1 Apr 1995, In: Nuclear Physics B. Suppl. 42, p. 3-16Research output: Contribution to journal › Journal article › Research
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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