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  • 1.
    Danielsson, Ulf
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Van Riet, Thomas
    Katholieke Univ Leuven, Inst Theoret Fys, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
    What if string theory has no de Sitter vacua?2018In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 27, no 12, article id 1830007Article, review/survey (Refereed)
    Abstract [en]

    We present a brief overview of attempts to construct de Sitter vacua in string theory and explain how the results of this 20-year endeavor could point to the fact that string theory harbors no de Sitter vacua at all. Making such a statement is often considered controversial and "bad news for string theory". We discuss how perhaps the opposite can be true.

  • 2.
    Grumiller, Daniel
    et al.
    Center for Theoretical Physics, Massachusetts Institute of Technology.
    Johansson, Niklas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Consistent boundary conditions for cosmological topologically massive gravity at the chiral point2008In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 17, no 13-14, p. 2367-2372Article in journal (Refereed)
    Abstract [en]

    We show that cosmological topologically massive gravity at the chiral point allows not only Brown-Henneaux boundary conditions as consistent boundary conditions, but slightly more general ones which encompass the logarithmic primary found in 0805.2610 as well as all its descendants.

  • 3.
    Sisman, Altug
    Istanbul Technical University, Nuclear Energy Institute.
    On The Upper Limit for Surface Temperature of a Static and Spherical Body2000In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 9, no 2, p. 215-225Article in journal (Refereed)
    Abstract [en]

    An upper limit for surface temperature of a static and spherical body in steady state is determined by considering the gravitational temperature drop (GTD). For this aim, abody consisting of black body radiation (BBR) only is considered. Thus, it is assumedthat body has minimum mass and minimum GTD. By solving the Oppenheimer-Volkoff equation, density distribution of self-gravitating thermal photon sphere with infinite radius is obtained. Surface temperature is defined as the temperature at distance of R from centre of this photon sphere. By means of the density-temperature relation of BBR, surface temperature is expressed as a function of central temperature and radius R. Variation of surface temperature with central temperature is examined. It is shown that surface temperature has a maximum for a finite value of central temperature. For this maximum, an analytical expression depending on only the radius is obtained. Since a real static and stable body with finite radius has much more mass and much more GTD than their values considered here, obtained maximum constitutes an upper limit for surface temperature of a real body. This limitation on surface temperature also limits the radiative energy lose from a body. It is shown that this limit for radiative energy lose is a constant independently from body radius and central temperature. Variation of the minimum mass with central temperature is also examined. It is seen that the surface temperature and minimum mass approach some limit values, which are less than their maximums, by making damping oscillations when central temperature goes to infinity.

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