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  • 1.
    Lindström, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Supersymmetric Sigma Model Geometry2012In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 4, no 3, p. 474-506Article in journal (Refereed)
    Abstract [en]

    This is a review of how sigma models formulated in Superspace have become important tools for understanding geometry. Topics included are: The (hyper)kahler reduction; projective superspace; the generalized Legendre construction; generalized Kahler geometry and constructions of hyperkahler metrics on Hermitian symmetric spaces.

  • 2.
    Pertoldi, Cino
    et al.
    Aalborg Univ, Dept Chem & Biosci, Fredrik Bajers Vej 7H, DK-9000 Aalborg, Denmark.;Aalborg Zoo, Dept Zool, Mollepk Vej 63, DK-9000 Aalborg, Denmark..
    Bahrndorff, Simon
    Aalborg Univ, Dept Chem & Biosci, Fredrik Bajers Vej 7H, DK-9000 Aalborg, Denmark..
    Novicic, Zorana Kurbalija
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology. Univ Belgrade, Inst Biol Res, Despot Stefan Blvd 142, Belgrade 11000, Serbia..
    Rohde, Palle Duun
    Aarhus Univ, Dept Mol Biol & Genet, Ctr Quantitat Genet & Genom, DK-8830 Tjele, Denmark.;Lundbeck Fdn Initiat Integrat Psychiat Res, iPSYCH, DK-8000 Aarhus, Denmark.;Aarhus Univ, Ctr Integrat Sequencing, iSEQ, DK-8000 Aarhus, Denmark..
    The Novel Concept of "Behavioural Instability" and Its Potential Applications2016In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 8, no 11, article id 135Article in journal (Refereed)
    Abstract [en]

    The concept of developmental instability (DI) is a well-known indicator of environmental and genetic stress and is often investigated using various indices such as fluctuating asymmetry, directional asymmetry, antisymmetry and phenotypic variance. Investigations dealing with DI are using morphometric traits. The aim of this investigation is to present the novel concept of behavioural instability in which the trait measured is a behavioural trait. We apply the conventional indices used for the estimation of developmental instability on directional movement-clockwise (CW) and counter-clockwise (CCW) movement of 19 highly inbred lines of Drosophila melanogaster tested in a circular arena. We show that it is possible to quantify behavioural instability using the indices traditionally used to investigate DI. Results revealed several significant differences among lines, depending on the index utilized. The perspectives of utilizing the concept in biological research such as toxicology, evolutionary and stress biology are discussed.

  • 3.
    Visinelli, Luca
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics. Stockholm Univ, Nordita, KTH Royal Inst Technol, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.
    (Non-)Thermal Production of WIMPs during Kination2018In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 10, no 11, article id 546Article in journal (Refereed)
    Abstract [en]

    Understanding the nature of the Dark Matter (DM) is one of the current challenges in modern astrophysics and cosmology. Knowing the properties of the DM particle would shed light on physics beyond the Standard Model and even provide us with details of the early Universe. In fact, the detection of such a relic would bring us information from the pre-Big Bang Nucleosynthesis (BBN) period, an epoch from which we have no direct data, and could even hint at inflation physics. In this work, we assume that the expansion rate of the Universe after inflation is governed by the kinetic energy of a scalar field phi, in the so-called "kination" model. Adding to previous work on the subject, we assume that the phi field decays into both radiation and DM particles, which we take to be Weakly Interacting Massive Particles (WIMPs). The present abundance of WIMPs is then fixed during the kination period through either a thermal "freeze-out" or "freeze-in" mechanism, or through a non-thermal process governed by the decay of phi. We explore the parameter space of this theory with the requirement that the present WIMP abundance provides the correct relic budget. Requiring that BBN occurs during the standard cosmological scenario sets a limit on the temperature at which the kination period ends. Using this limit and assuming the WIMP has a mass m(chi) = 100 GeV, we obtain that the thermally averaged WIMP annihilation cross section has to satisfy the constraints 4 x 10(-16) GeV-2 less than or similar to <sigma upsilon > less than or similar to 2 x 10(-5) GeV-2 in order for having at least one of the production mechanism to yield the observed amount of DM. This result shows how the properties of the WIMP particle, if ever measured, can yield information on the pre-BBN content of the Universe.

  • 4.
    Visinelli, Luca
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics. KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.
    Vagnozzi, Sunny
    KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden;Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, Dept Phys, AlbaNova Univ Ctr, Roslagstullsbacken 21A, SE-10691 Stockholm, Sweden;Univ Cambridge, Kavli Inst Cosmol KICC, Madingley Rd, Cambridge CB3 0HA, England;Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Danielsson, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Revisiting a Negative Cosmological Constant from Low-Redshift Data2019In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 11, no 8, article id 1035Article in journal (Refereed)
    Abstract [en]

    Persisting tensions between high-redshift and low-redshift cosmological observations suggest the dark energy sector of the Universe might be more complex than the positive cosmological constant of the ?CDM model. Motivated by string theory, wherein symmetry considerations make consistent AdS backgrounds (i.e., maximally-symmetric spacetimes with a negative cosmological constant) ubiquitous, we explore a scenario where the dark energy sector consists of two components: a negative cosmological constant, with a dark energy component with equation of state w phi on top. We test the consistency of the model against low-redshift baryon acoustic oscillation and Type Ia supernovae distance measurements, assessing two alternative choices of distance anchors: the sound horizon at baryon drag determined by the Planck collaboration and the Hubble constant determined by the SH0ES program. We find no evidence for a negative cosmological constant and mild indications for an effective phantom dark energy component on top. A model comparison analysis reveals that the ?CDM model is favoured over our negative cosmological constant model. While our results are inconclusive, should low-redshift tensions persist with future data, it would be worth reconsidering and further refining our toy negative cosmological constant model by considering realistic string constructions.

  • 5.
    Zhu, Jun
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
    Dahlstrand, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
    Smith, Joshua R.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
    Villaume, Sebastien
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
    Ottosson, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
    On the Importance of Clar Structures of Polybenzenoid Hydrocarbons as Revealed by the n-Contribution to the Electron Localization Function2010In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 2, no 3, p. 1653-1682Article in journal (Refereed)
    Abstract [en]

    The degree of p-electron (de)localization and aromaticity of a series of polybenzenoid hydrocarbons (PBHs) has been analyzed through the π-contribution to the electron localization function (ELFπ), calculated at the B3LYP/6-311G(d,p) hybrid density functional theory level. The extent of p-electron delocalization in the various hexagons of a PBH was determined through analysis of the bifurcation values of the ELFp basins (BV(ELFp)), the spans in the bifurcation values in each hexagon (ΔBV(ELFπ)), and the ring-closure bifurcation values of the ELFπ (RCBV(ELFπ)). These computed results were compared to the qualitative description of local aromaticities of the different hexagons in terms of Clar structures with p-sextets. Benzene, [18]annulene, and thirty two PBHs were analyzed at their equilibrium geometries, and benzene and triphenylene were also analyzed at bond length distorted structures. In general, the description of PBHs in terms of Clar valence structures is supported by the ELFp properties, although there are exceptions. For PBHs at their equilibrium geometries there is a clear sigmoidal relationship between the CC bond lengths and the amount of p-electron (de)localization at these bonds, however, this relationship is lost for bond distorted geometries. In the latter cases, we specifically examined benzene in D3h symmetric “1,3,5-cyclohexatriene” structures and triphenylene in eight different structures. From the distorted benzenes and triphenylenes it becomes clear that there is a distinct tendency for the p-electron network to retain delocalization (aromaticity). The ELFp analysis thus reveals an antidistortive rather than a distortive behavior of the p-electrons in these investigated compounds.

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