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Sökning: WFRF:(Andreasson Håkan)

  • Resultat 31-40 av 85
  • Föregående 123[4]567...9Nästa
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31.
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  • Andreasson, Håkan, 1966-, et al. (författare)
  • Gravitational collapse and the formation of black holes for the spherically symmetric Einstein-Vlasov system.
  • 2010
  • Ingår i: Quarterly of Applied Mathematics. - 1552-4485. ; 68, s. 17-42
  • Tidskriftsartikel (refereegranskat)abstract
    • We review results on the spherically symmetric, asymptotically flat Einstein-Vlasov system. We focus on a recent result where we found explicit conditions on the initial data which guarantee the formation of a black hole in the evolution. Among these data there are data such that the corresponding solutions exist globally in Schwarzschild coordinates. We put these results into a more general context, and we include arguments which show that the spacetimes we obtain satisfy the weak cosmic censorship conjecture and contain a black hole in the sense of suitable mathematical definitions of these concepts which are available in the literature.
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35.
  • Andreasson, Håkan, et al. (författare)
  • Histopathological Classification of Pseudomyxoma Peritonei and the Prognostic Importance of PINCH Protein
  • 2012
  • Ingår i: Anticancer Research. - 0250-7005 .- 1791-7530. ; 32:4, s. 1443-1448
  • Tidskriftsartikel (refereegranskat)abstract
    • Aim:The aims of this study were i) to assess a new and more detailed histopathological classification and to analyze concordance between pathologists in the histopathological classification of pseudomyxoma peritonei (PMP); ii) to analyze the expression in the stroma of the particularly interesting new cysteine-histidine (PINCH) protein and its prognostic importance in PMP.Materials and Methods:Surgical specimens from 81 patients, classified according to the Ronnett et al histopathological classification were compared to a new system with four groups ranging from indolent to aggressive growth patterns. PINCH protein expression was analyzed and was related to clinical variables.Results:The new four-group classification provided better prognostic information than the classification according to Ronnett et al. (p=0.04). Expression of the PINCH protein in the stroma was found in 83% of the cases and was associated with high tumor burden (p=0.002) and a poor prognosis (p=0.04).Conclusion:The proposed new PMP classification system may provide additional prognostic information. PINCH protein is expressed in PMP and has prognostic information.
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36.
  • Andreasson, Håkan, 1966-, et al. (författare)
  • Models for Self-Gravitating Photon Shells and Geons
  • 2017
  • Ingår i: Annales Henri Poincare. - 1424-0637. ; 18:2, s. 681-705
  • Tidskriftsartikel (refereegranskat)abstract
    • We prove existence of spherically symmetric, static, self-gravitating photon shells as solutions to the massless Einstein-Vlasov system. The solutions are highly relativistic in the sense that the ratio 2m(r) / r is close to 8 / 9, where m(r) is the Hawking mass and r is the area radius. In 1955 Wheeler constructed, by numerical means, so-called idealized spherically symmetric geons, i.e., solutions of the Einstein-Maxwell equations for which the energy momentum tensor is spherically symmetric on a time average. The structure of these solutions is such that the electromagnetic field is confined to a thin shell for which the ratio 2m / r is close to 8 / 9, i.e., the solutions are highly relativistic photon shells. The solutions presented in this work provide an alternative model for photon shells or idealized spherically symmetric geons.
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  • Andreasson, Håkan, 1966- (författare)
  • On global existence for the spherically symmetric Einstein-Vlasov system in Schwarzschild coordinates
  • 2007
  • Ingår i: Indiana University Mathematics Journal. - 0022-2518. ; 56:2, s. 523-552
  • Tidskriftsartikel (refereegranskat)abstract
    • The spherically symmetric Einstein-Vlasov system in Schwarzschild coordinates (i.e., polar slicing and areal radial coordinate) is considered. An improved continuation criterion for global existence of classical solutions is given. Two other types of criteria which prevent finite time blow-up are also given.
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  • Resultat 31-40 av 85
  • Föregående 123[4]567...9Nästa
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