Chul-Moon Yoo

Another realization of Kerr/CFT correspondence

Abstract We study another realization of the Kerr/CFT correspondence. By imposing new asymptotic conditions for the near-horizon geometry of Kerr black hole, an asymptotic symmetry which contains all of the exact isometries can be obtained. In particular, the Virasoro algebra can be realized as an enhancement of SL ( 2 , R ) symmetry of the AdS geometry. By using this asymptotic symmetry, we discuss finite temperature effects and show the correspondence concretely.

Can Inhomogeneities Accelerate the Cosmic Volume Expansion

If expanding and contracting regions coexist in the universe, the speed of the cosmic volume expansion can be accelerated. We construct simple inhomogeneous dust-filled universe models in which the speed of the cosmic volume expansion is accelerated for finite periods. These models are constructed by removing spherical domains from the Einstein-de Sitter �

Solving the Inverse Problem with Inhomogeneous Universes

We construct the Lema\^itre-Tolman-Bondi (LTB) dust universe whose distance-redshift relation is equivalent to that in the concordance

Threshold of primordial black hole formation

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Non-Gaussianity in the Cosmic Microwave Background temperature fluctuations from cosmic (super-)strings

cold dark matter (

Black Hole Universe: Time Evolution

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Yet another realization of Kerr/CFT correspondence

CDM) cosmological model. In our model, the density distribution and velocity field are not homogeneous, whereas the big-bang time is uniform, which implies that the universe is homogeneous at its beginning. We also study the effects of local clumpiness in the density distribution as well as the effects of large-scale inhomogeneities on the distance-redshift relation, and show that these effects may reduce the amplitude of large-scale inhomogeneities necessary for having a distance-redshift relation that is the same as that of the concordance

Redshift Drift in LTB Void Universes

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Conformal symmetry for rotating D-branes

CDM universe. We also study the temporal variation of the cosmological redshift and show that, by the observation of this quantity, we can distinguish our LTB universe model from the concordance

Sound Modes in Holographic Hydrodynamics for Charged AdS Black Hole

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