Bosonic formulation of the negative energy sea, so called Dirac sea, isproposed by constructing a hole theory for bosons as a new formulation of thesecond quantization of bosonic fields. The original idea of Dirac sea forfermions, where the vacuum state is considered as a state completely filled byfermions of negative energy and holes in the sea are identified asanti-particles, is extended to boson case in a consistent manner. The bosonicvacuum consists of a sea filled by negative energy bosonic states, whilephysical probabilities become always positive definite. We introduce a methodof the double harmonic oscillator to formulate the hole theory of bosons. Ourformulation is also applicable to supersymmetric field theory. The sea forsupersymmetric theories has an explicit supersymmetry. We suggest applicationsof our formulations to the anomaly theories and the string theories.
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