Talk detail

Participant	Kim, Sung-Won
Institution	Ewha Womans University - 52 Ewhayeodae-gil - Seoul - - South Korea

Session	AT3	Accepted		Order	Time
Talk	Oral abstract	Title	Cosmological Horizons for Wormhole Cosmology
Coauthors
Abstract	Recently we got the exact solution of the cosmological model from the isotropic form of the Morris-Thorne type wormhole. By solving the Einstein's field equation, we found the exact solution of a wormhole in expanding Friedmann-Lemaitre-Robertson-Walker universe. The matter or radiation or lambda is considered as the component of single component universe. For the multi-component universe case, we adopt the Lambda-CDM universe with matter and lambda. In case of the single-component universe, the apparent horizons coincide at a certain time. However, they have two coincidence times in the multi component universe, which means that they start at early times and finish at late times like the combination of two single component universes. The particle horizon is also discussed on what is happening for the case of with wormhole. The particle horizon with wormhole shows the elimination of wormhole region and that without wormhole starts later than that with wormhole in proper distance coordinate. The past light cones with or without wormhole shows the similar natures to the particle horizon.
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Session	ED1	Accepted		Order	Time
Talk	Oral abstract	Title	The Validity of the Rubber Sheet as an Analogy of Curved Space in General Relativity
Coauthors
Abstract	In this presentation, we examine the validity of the analogy of rubber sheet for curved space through the comparison of two surface equations. The Poisson equation and variation method were used for the comparison. The misconceptions of the students from the rubber sheet analogy and possible demonstration were also introduced for the instruction in the class.
Pdf file