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<p>We incorporate closed string field into Kaku’s open string field theory which is defined using Kaku vertex, and we construct open-closed string field theory. To do this, we define new consistent open-closed vertex and open-open-closed vertex with the Kaku vertex. Because these vertices depend on Chan-Paton parameter such as the Kaku vertex, the open-closed string field theory action that we construct depends on the Chan-Paton parameter such as the Kaku’s theory action. However, we can show that an infinitesimal change in <i>l</i> corresponds to a field redefinition. Furthermore, we compute closed string amplitudes around tachyon vacuum solution in this theory. As a result, we confirm that these amplitudes are conventional pure closed string amplitudes on surfaces without boundaries.</p>

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Closed string amplitudes around tachyon vacuum solution in Kaku theory

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月2日

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  • Yuji Ando

摘要

We incorporate closed string field into Kaku’s open string field theory which is defined using Kaku vertex, and we construct open-closed string field theory. To do this, we define new consistent open-closed vertex and open-open-closed vertex with the Kaku vertex. Because these vertices depend on Chan-Paton parameter such as the Kaku vertex, the open-closed string field theory action that we construct depends on the Chan-Paton parameter such as the Kaku’s theory action. However, we can show that an infinitesimal change in l corresponds to a field redefinition. Furthermore, we compute closed string amplitudes around tachyon vacuum solution in this theory. As a result, we confirm that these amplitudes are conventional pure closed string amplitudes on surfaces without boundaries.