Observational tests of wormholes

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The purpose of this research is to find methods of observational tests of wormholes. Until recently, wormholes are purely hypothetical objects introduced by the General Theory of Relativity. There was no restriction on the abundance. We have held two workshops to discuss the methods and meaning of the tests of wormholes. There have been amazing progress. Several new methods have been proposed. Then three attempts have been done to search wormholes. Until now, no candidate has been found. The limits have been imposed on the cm size wormholes and galactic scale wormholes. A preliminary limit has been imposed on the planet size wormhole. These results implies wormholes are not abundant as stars. There were several activities on the stabilities of wormholes. These studies show the wormholes are unstable and hard to survive cosmological age.