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Using the level truncation method, we construct numerical solutions, whichare twist even and SU(1,1) singlet, in the theory around the Takahashi-Tanimotoidentity-based solution (TT solution) with a real parameter $a$ in theframework of bosonic open string field theory. We find solutions correspondingto "double brane" and "ghost brane" solutions which were constructed by Kudrnaand Schnabl in the conventional theory around the perturbative vacuum. Oursolutions show somewhat similar $a$-dependence to tachyon vacuum and singlebrane solutions, which we found in the earlier works. In this sense, we mightbe able to expect that they are consistent with the conventional interpretationof $a$-dependence of the TT solution. We observe that numerical complexsolutions at low levels become real ones at higher levels for some region ofthe parameter $a$. However, these real solutions do not so improveinterpretation for double brane.

Numerical twist-even SU(1,1)-singlet solutions in open string field theory around the identity-based solution