Jan Ambjørn
Professor, emeritus
Theoretical high energy, astroparticle and gravitational physics
Blegdamsvej 17
2100 København Ø
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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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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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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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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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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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3D quantum gravity coupled to matter
Ambjørn, Jan, Burda, Z., Jurkiewicz, J. & Kristjansen, Charlotte Fløe, 31 Dec 1992, In: Physics Letters B. 297, 3-4, p. 253-260Research 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
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4-dimensional dynamically triangulated gravity coupled to matte
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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A Lorentzian cure for euclidean troubles
Ambjørn, Jan, Dasgupta, A., Jurkiewicz, J. & Loll, R., 28 May 2002, In: Nuclear physics B, Proceedings supplements. 106, p. 977-979Research output: Contribution to journal › Conference 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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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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A c=1 phase transition in two-dimensional CDT/Horava-Lifshitz gravity?
Ambjørn, Jan, Gorlich, A., Jurkiewicz, J. & Zhang, H., 9 Apr 2015, In: Physics Letters B: Particle Physics, Nuclear Physics and Cosmology. 743, p. 435-439Research output: Contribution to journal › Journal article › Research › peer-review
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A causal alternative for c=0 strings
Ambjørn, Jan, Loll, R., Watabiki, Y., Westra, W. & Zohren, S., 2 Dec 2008, In: Acta Physica Polonica B. 39, 12, p. 3355-3364 10 p.Research output: Contribution to journal › Conference article › Research › peer-review
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A color magnetic vortex condensate in QCD
Ambjørn, Jan & Olesen, Poul, 20 Oct 1980, In: Nuclear Physics B. 170, 2, p. 265-282Research output: Contribution to journal › Journal article › Research › peer-review
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A comment on the nonperturbative d=1 string theory
Ambjørn, Jan, Jurkiewicz, J. & Krzywcki, A., 5 Jul 1990, In: Physics Letters B. 243, 4, p. 373-377Research output: Contribution to journal › Journal article › Research › peer-review
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A condensate solution of the electroweak theory which interpolates between the broken and the symmetric phase
Ambjørn, Jan & Olesen, Poul, 22 Jan 1990, In: Nuclear Physics B. 330, 1, p. 193-204Research 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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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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A model for emergence of space and time
Ambjørn, Jan & Watabiki, Y., 7 Oct 2015, In: Physics Letters B. 749, p. 149-152Research 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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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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A new continuum limit of matrix models
Ambjørn, Jan, Loll, R., Watabiki, Y., Westra, W. & Zohren, S., 18 Dec 2008, In: Physics Letters B. 670, 2, p. 224-230 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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A new family of integrable extended multi-band Hubbard Hamiltonians
Ambjørn, Jan, Sedrakyan, A., Avakyan, A. & Hakobyan, T., 7 Mar 1998, In: Modern Physics Letters A. 13, 7, p. 495-503Research output: Contribution to journal › Journal article › Research › peer-review
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A non-perturbative definition of 2D quantum gravity by the fifth time action
Ambjørn, Jan, Greensite, J. & Varsted, S., 25 Oct 1990, In: Physics Letters B. 249, 3-4, p. 411-416Research output: Contribution to journal › Journal article › Research › peer-review
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A note on the Lee-Yang singularity coupled to 2d quantum gravity
Ambjørn, Jan, Gorlich, A., Ipsen, A. C. & Zhang, H. -., 30 Jul 2014, In: Physics Letters B: Particle Physics, Nuclear Physics and Cosmology. 735, p. 191-194Research output: Contribution to journal › Journal article › Research › peer-review
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A random surface theory with nontrivial gamma(string)
Ambjørn, Jan, Burda, Z., Jurkiewicz, J. & Peterson, B., 5 Jan 1995, In: Physics Letters B. 341, 3-4, p. 286-292Research output: Contribution to journal › Journal article › Research
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A random walk representation of the Dirac propagator
Ambjørn, Jan, Durhuus, Bergfinnur & Jonsson, T., 29 Jan 1990, In: Nuclear Physics B. 330, 2-3, p. 509-522Research output: Contribution to journal › Journal article › Research › peer-review
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A renormalization group analysis of lattice models of two-dimensional membranes
Ambjørn, Jan, Durhuus, Bergfinnur, Frohlich, J. & Jonsson, T., 1 Apr 1989, In: Journal of Statistical Physics. 55, 1-2, p. 29-85Research output: Contribution to journal › Journal article › Research › peer-review
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A restricted dimer model on a two-dimensional random causal triangulation
Ambjørn, Jan, Durhuus, Bergfinnur & Wheater, J. F., 2014, In: Journal of Physics A: Mathematical and Theoretical. 47, 365001 .Research output: Contribution to journal › Journal article › Research › peer-review
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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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A solvable 2D gravity model with Gamme greater than zero
Durhuus, Bergfinnur, Ambjørn, Jan & Jónsson, T., 1995, In: Modern Physics Letters A. 9, p. 1221-1228Research output: Contribution to journal › Journal article › Research › peer-review
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A string field theory based on causal dynamical triangulations
Ambjørn, Jan, Loll, R., Watabiki, Y., Westra, W. & Zohren, S., 1 May 2008, In: Journal of High Energy Physics (Online). 2008, 5, p. 032Research output: Contribution to journal › Journal article › Research › peer-review
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A universal fractal structure of 2d quantum gravity for c > 1
Ambjørn, Jan & Thorleifsson, G., 3 Mar 1994, In: Physics Letters B. 323, 1, p. 7-12Research output: Contribution to journal › Journal article › Research
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ASYMPTOTIC FREEON - AN EXAMPLE OF ELECTROWEAK MAGNETISM
Ambjørn, Jan & Olesen, Poul, 1 Feb 1990, In: Acta Physica Polonica B. 21, 2, p. 109-117Research output: Contribution to journal › Journal article › Research › peer-review
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Abelian gauge fields coupled to simplicial quantum gravity
Ambjørn, Jan, Anagnostopoulos, K. N. & Jurkiewicz, J., 28 Oct 1999, In: Journal of High Energy Physics. 1999, 8, p. 016Research 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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Alternative Actions for Quantum Gravity and the Intrinsic Rigidity of the Space-Time
Ambjørn, Jan, Savvidy, G. K. & Savvidy, K. G., 17 Feb 1997, In: Nuclear Physics B. 486, 1-2, p. 390-412Research output: Contribution to journal › Journal article › Research
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An integrable model with a non-reducible three particle R-matrix
Ambjørn, Jan, Khachatryan, S. & Sedrakyan, A., 30 Jul 2004, In: Journal of Physics A: Mathematical and Theoretical. 37, 30, p. 7397-7406Research 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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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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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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Baby universes in 2D quantum gravity
Ambjørn, Jan, Jain, S. & Thorleifsson, G., 10 Jun 1993, In: Physic Letters B. 307, 1-2, p. 34-39Research output: Contribution to journal › Journal article › Research
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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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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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Baryon asymmetry generation in the electroweak theory: A lattice study
Ambjørn, Jan, Laursen, M. L. & Shaposhnikov, M. E., 10 Apr 1989, In: Nuclear Physics B. 316, 2, p. 483-508Research output: Contribution to journal › Journal article › Research › peer-review
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Baryon asymmetry of the universe. A Monte Carlo study on the lattice
Ambjørn, Jan, Laursen, M. & Shaposhnkov, M. E., 22 Oct 1987, In: Physics Letters B. 197, 1-2, p. 49-54Research 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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CAUSAL DYNAMICAL TRIANGULATIONS AND THE SEARCH FOR A THEORY OF QUANTUM GRAVITY
Ambjørn, Jan, Görlich, A., Jurkiewicz, J. & Roll, R., 1 Jul 2013, In: International Journal of Modern Physics D. 22, 9, 19 p., 1330019.Research output: Contribution to journal › Journal article › Research › peer-review
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CDT Quantum Toroidal Spacetimes: An Overview
Ambjørn, Jan, Drogosz, Z., Gizbert-Studnicki, J., Gorlich, A., Jurkiewicz, J. & Nemeth, D., 26 Mar 2021, In: Universe. 7, 4, 26 p., 79.Research output: Contribution to journal › Review › Research › peer-review
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CDT and the big bang
Ambjørn, Jan & Watabiki, Y., 1 Apr 2017, In: Acta Physica Polonica B, Proceedings Supplement. 10, 2, p. 299-303Research 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
Research output: Contribution to journal › Journal article › Research › peer-review
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