Publications
123 results found
Rajantie A, Rummukainen K, Weir DJ, 2012, Form factor and width of a quantum string, PHYSICAL REVIEW D, Vol: 86, ISSN: 1550-7998
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- Citations: 3
Rajantie A, 2012, Magnetic monopoles in field theory and cosmology, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 370, Pages: 5705-5717, ISSN: 1364-503X
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- Citations: 13
D'Onofrio M, Lerner RN, Rajantie A, 2012, Electrically charged curvaton, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516
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- Citations: 8
Rajantie A, Weir DJ, 2012, Nonperturbative study of the 't Hooft-Polyakov monopole form factors, PHYSICAL REVIEW D, Vol: 85, ISSN: 1550-7998
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- Citations: 8
Rajantie A, 2012, Introduction to magnetic monopoles, CONTEMPORARY PHYSICS, Vol: 53, Pages: 195-211, ISSN: 0010-7514
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- Citations: 33
Mulryne D, Orani S, Rajantie A, 2011, Non-Gaussianity from the hybrid potential, PHYSICAL REVIEW D, Vol: 84, ISSN: 2470-0010
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- Citations: 30
Figueroa DG, Garcia-Bellido J, Rajantie A, 2011, On the transverse-traceless projection in lattice simulations of gravitational wave production, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516
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- Citations: 28
Weir DJ, Rajantie A, 2011, Form factors and excitations of topological solitons, 9th International Conference on Quark Confinement and the Hadron Spectrum, Publisher: AMER INST PHYSICS, Pages: 200-202, ISSN: 0094-243X
Rajantie A, Weir DJ, 2010, Soliton form factors from lattice simulations, PHYSICAL REVIEW D, Vol: 82, ISSN: 1550-7998
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- Citations: 8
Rajantie A, Tranberg A, 2010, Counting defects with the two-point correlator, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 6
Chambers A, Nurmi S, Rajantie A, 2010, Non-Gaussianity from resonant curvaton decay, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516
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- Citations: 39
Edwards S, Mehta D, Rajantie A, et al., 2009, 't Hooft-Polyakov monopoles in lattice SU(N) plus adjoint Higgs theory, PHYSICAL REVIEW D, Vol: 80, ISSN: 1550-7998
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- Citations: 6
Rajantie A, Weir DJ, 2009, Quantum kink and its excitations, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 7
Rajantie A, 2009, Super-horizon cosmic string correlations, PHYSICAL REVIEW D, Vol: 79, ISSN: 1550-7998
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- Citations: 6
Chambers A, Rajantie A, 2008, Non-Gaussianity from massless preheating, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516
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- Citations: 42
Chambers A, Rajantie A, 2008, Lattice calculation of non-Gaussian density perturbations from the massless preheating inflationary model, PHYSICAL REVIEW LETTERS, Vol: 100, ISSN: 0031-9007
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- Citations: 80
Rajantie A, 2007, AIP Conference Proceedings: Preface, AIP Conference Proceedings, Vol: 957, ISSN: 0094-243X
Rajantie A, Contaldi C, Dauncey P, et al., 2007, Particles, Strings, and Cosmology: 13th International Symposium on Particles, Strings, and Cosmology, Publisher: American Institute of Physics, ISBN: 978-0-7354-0471-7
Rajantie A, Sakellariadou M, Stoica H, 2007, Numerical experiments with p F- and q D-strings: the formation of (p,q) bound states, Journal of Cosmology and Astroparticle Physics, Vol: 11
We investigate the behaviour of (p, q) string networks, focusing on two aspects: (1) modelling more realistic (p, q) string networks than the ZN networks used so far, and (2) investigating the effect of long-range interactions on the evolution of the network. We model the network with no long-range interactions using two sets of fields, complex scalars coupled to gauge fields, with a potential chosen such that the two types of strings will form bound states. This way we can model junctions of three strings with different tension; in ZN models used so far in simulations all the strings have identical tensions. In order to introduce long-range interactions we also study a network in which one of the scalars forms global strings. We observe that in the absence of long-range interactions the formation of bound states has a significant influence on the evolution of the network. When long-range interactions are turned on, the bound states are short-lived and have a minimal effect on the network evolution.
Donaire M, Kibble TWB, Rajantie A, 2007, Spontaneous vortex formation on a superconductor film, New journal of physics, Vol: 9
Rajantie A, Tranberg A, 2006, Looking for defects in the 2PI correlator, J HIGH ENERGY PHYS, ISSN: 1126-6708
Truncations of the 2PI effective action are seen as a promising tool to study non-equilibrium dynamics in quantum field theories. We probe their applicability in the non-perturbative setting of topological defect formation in a symmetry-breaking phase transition, by comparing full classical lattice field simulations and the 2PI formulation for classical fields in an O(N) symmetric scalar field theory. At next-to-leading order in 1/N, the 2PI formalism fails to reproduce any signals of defects in the two-point function. This suggests that one should be careful when applying the 2PI formalism for symmetry breaking phase transitions.
Donaire M, Rajantie A, 2006, Heavy cosmic strings, PHYS REV D, Vol: 73, ISSN: 1550-7998
We argue that cosmic strings with high winding numbers generally form in first-order gauge symmetry breaking phase transitions, and we demonstrate this using computer simulations. These strings are heavier than single-winding strings and therefore more easily observable. Their cosmological evolution may also be very different.
Rajantie A, 2006, Mass of a quantum 't Hooft-Polyakov monopole, J HIGH ENERGY PHYS, ISSN: 1126-6708
The quantum mechanical mass of 't Hooft-Polyakov monopoles in the four-dimensional Georgi-Glashow is calculated non-perturbatively using lattice Monte Carlo simulations. This is done by imposing twisted boundary conditions that ensure there is one unit of magnetic charge on the lattice, and measuring the free energy difference between this ensemble and the vacuum. In the weak-coupling limit, the results can be used to determine the quantum correction to the classical mass, once renormalisation of couplings is taken properly into account. The methods can also be used to study the masses at strong coupling, i.e., near the critical point, where there are hints of a possible electric-magnetic duality.
Copeland EJ, Rajantie A, 2005, The end of locked inflation, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516
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- Citations: 4
Rajantie A, 2005, Charge correlations in heavy ion collisions, 6th International Conference on Strong and Electroweak Matter (SEWM 2004), Publisher: WORLD SCIENTIFIC PUBL CO PTE LTD, Pages: 157-161
Rajantie A, 2005, Kosmisia j?nteit? suprajohteissa (in Finnish), Arkhimedes, Vol: 3, Pages: 9-13, ISSN: 0004-1920
Kajantie K, Laine M, Neuhaus T, et al., 2004, Duality and scaling in 3-dimensional scalar electrodynamics, NUCLEAR PHYSICS B, Vol: 699, Pages: 632-656, ISSN: 0550-3213
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- Citations: 14
Donaire M, Kibble TWB, Rajantie A, 2004, Spontaneous vortex formation on a superconductor film, Arxiv.org, Pages: 1-9
Kibble TWB, Rajantie A, 2003, Estimation of vortex density after superconducting film quench, PHYSICAL REVIEW B, Vol: 68, ISSN: 1098-0121
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- Citations: 10
Rajantie A, 2003, Defect formation in the early universe, CONTEMPORARY PHYSICS, Vol: 44, Pages: 485-502, ISSN: 0010-7514
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- Citations: 13
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