Institution
University of Jyväskylä
Education•Jyvaskyla, Finland•
About: University of Jyväskylä is a education organization based out in Jyvaskyla, Finland. It is known for research contribution in the topics: Population & Neutron. The organization has 8066 authors who have published 25168 publications receiving 725033 citations. The organization is also known as: Jyväskylän yliopisto & Kasvatusopillinen korkeakoulu.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors investigate theories in which the technifermions in higher dimensional representations of the technicolor gauge group dynamically break the electroweak symmetry of the standard model.
Abstract: We investigate theories in which the technifermions in higher dimensional representations of the technicolor gauge group dynamically break the electroweak symmetry of the standard model. Somewhat surprisingly, for the two-index symmetric representation of the gauge group the lowest number of techniflavors needed to render the underlying gauge theory quasiconformal is two. This is exactly one doublet of technifermions with respect to the weak interactions promoting these theories to ideal candidates of walking type technicolor models. From the point of view of the weak interactions the two techniflavor theory has a Witten anomaly, which we cure by introducing a fourth family of leptons. An elegant feature of this model is that the techniquarks resemble an extra family of quarks arranged in the two-index symmetric representation of the SU(2) technicolor theory. We have also studied the theory with three technicolors and two techniflavors in the two-index symmetric representation of the gauge group, which does not require a fourth family of leptons. We confront the models with the recent electroweak precision measurements and demonstrate that the two technicolor theory is a valid candidate for electroweak symmetry breaking via new strong interactions. We investigate different hypercharge assignments for the two color theory and associatedmore » fourth family type of leptons. We find that the two technicolor theory is within the 90% confidence level contours defined by the oblique parameters. The electroweak precision measurements provide useful constraints on the relative mass splitting of the new leptons. In the case of a fourth family of leptons with ordinary lepton hypercharge the new heavy neutrino can be a natural candidate of cold dark matter. The mass of this heavy neutrino, constrained by the precision measurements, is slightly larger than the one of the neutral electroweak gauge boson while the charged lepton has a mass roughly twice as large as the associated neutrino. Extensions with a larger value of the hypercharge naturally featuring doubly charged leptons are also favored by precision measurements. We also propose theories in which the critical number of flavors needed to enter the conformal window is higher than the one with fermions in the two-index symmetric representation, but lower than in the walking technicolor theories with fermions only in the fundamental representation of the gauge group. The simplest theories are the ones in which we add a (techni)gluino to the theory, while the rest of the matter fermions remain in the fundamental representation of the gauge group. Although these theories share some features with split supersymmetric theories, they are introduced here to address the hierarchy problem. Because of the near-conformal/chiral phase transition, we show that the composite Higgs is very light compared to the intrinsic scale of the technicolor theory. For the two technicolor theory we predict the composite Higgs mass not to exceed 150 GeV. We also provide estimates for the Higgs mass in walking technicolor theories with fermions in the fundamental representation and show that in this case the mass is around 400 GeV.« less
342 citations
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TL;DR: In this paper, a pedagogical introduction to density-functional tight-binding (DFTB) method is given, where the authors derive it from the density functional theory, give the details behind the tight binding formalism, and give practical recipes for parametrization: how to calculate pseudo-atomic orbitals and matrix elements.
341 citations
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TL;DR: A preference-based evolutionary approach that can be used as an integral part of an interactive algorithm that does not have to be generated with equal accuracy is proposed.
Abstract: In this paper, we discuss the idea of incorporating preference information into evolutionary multi-objective optimization and propose a preference-based evolutionary approach that can be used as an integral part of an interactive algorithm One algorithm is proposed in the paper At each iteration, the decision maker is asked to give preference information in terms of his or her reference point consisting of desirable aspiration levels for objective functions The information is used in an evolutionary algorithm to generate a new population by combining the fitness function and an achievement scalarizing function In multi-objective optimization, achievement scalarizing functions are widely used to project a given reference point into the Pareto optimal set In our approach, the next population is thus more concentrated in the area where more preferred alternatives are assumed to lie and the whole Pareto optimal set does not have to be generated with equal accuracy The approach is demonstrated by numerical examples
341 citations
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TL;DR: The results of these experiments imply that Achilles tendon forces are unexpectedly high in certain activities and that the rates of loading rather than the absolute magnitudes of the recorded forces may be more relevant for clinical purposes as well as for the construction of artificial tendon materials.
340 citations
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TL;DR: In most taxa, females are more likely than males to care for offspring as discussed by the authors, and the answer has been traced back to sexual differences in pre-mating reproductive investment (unequal gamete size or anisogamy).
Abstract: In most taxa, females are more likely than males to care for offspring. Why? Ever since Trivers' landmark work, the answer has been traced back to sexual differences in pre-mating reproductive investment (unequal gamete size or anisogamy). However, recent work shows that parental investment theory has inadvertently ignored a profoundly simple fact of life: every offspring has a mother and father. Taking this into account completely changes how we should think about sex differences in parental care.
339 citations
Authors
Showing all 8239 results
Name | H-index | Papers | Citations |
---|---|---|---|
Brenda W.J.H. Penninx | 170 | 1139 | 119082 |
Mika Kivimäki | 166 | 1515 | 141468 |
Jaakko Kaprio | 163 | 1532 | 126320 |
Marvin Johnson | 149 | 1827 | 119520 |
Stanislas Dehaene | 149 | 456 | 86539 |
Roger Jones | 138 | 998 | 114061 |
Zubayer Ahammed | 129 | 912 | 59811 |
James Alexander | 129 | 886 | 75096 |
Matti J Kortelainen | 128 | 1186 | 80603 |
Madan M. Aggarwal | 124 | 883 | 56065 |
Joakim Nystrand | 117 | 658 | 50146 |
Robert U. Newton | 109 | 753 | 42527 |
Dieter Røhrich | 102 | 637 | 35942 |
Keijo Häkkinen | 99 | 421 | 31355 |
Dong Jo Kim | 98 | 497 | 36272 |