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  • From large extra-dimensions to dark energy: an introduction to brane world models


    What:
     
    From large extra-dimensions to dark energy: an introduction to brane world models
     
     
     
     
    Who:
    Dr. Tiberiu Harko
    ( The University of Hong Kong )
     
     
     
    When:
    Wednesday Afternoon ,Dec.24th,4:00 p.m.
     
     
       
    Where:
     
     
     
    Main building of the Physics department of Nanjing University,Room 233
    Welcome to attend
     
     
       

    abstract

      The idea that our four-dimensional universe (the brane) may be embedded in a higher  dimensional universe (called the bulk) has attracted a lot of interest. Gravity is localized  near the brane at low energies, even if the extra dimension is noncompact. A review is given  of the classical geometry,dynamics and cosmological and astrophysical implications of the  brane-world models. The field equations on the brane modify the field equations of general  relativity in two ways: local 5-D effects are imprinted on the brane as a result of its  embedding, and are significant at high energies; nonlocal effects arise from the 5-D Weyl  tensor. The Weyl tensor transmits tidal (Coulomb),gravitomagnetic and gravitational wave  effects to the brane from the 5-D nonlocal gravitational field. In astrophysics, local and  nonlocal effects introduce fundamental changes to gravitational collapse, black hole solutions  and for the propagations of the electromagnetic waves. The possibility of observationally  testing the brane world model will also be considered in detail.
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