A SINGULARITY-AVOIDED OSCILLATING BOUNCING COSMOLOGICAL MODEL

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<正> According to the boundary theory of singularity, singularity is the boundary of the non-spacelike inextensible geodesics. So the cosmological singularity means that the evolving universe must have a beginning or an end where the causality chains
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<正> Ⅰ. INTRODUCTION Quartz has been widely used in radio industry, optical instruments and the like. It is used in manufacturing crystal filter, crystal oscil