Chronology Protection in Stringy Gödel Spacetime: Tachyon Supertube Probes
نویسنده
چکیده
We study the tachyon supertube probes on a type IIA supergravity background which behaves as a stringy Gödel spacetime and contains closed timelike curve. In the case of small value of f , which is a parameter of the background, we use the Minahan-Zwiebach tachyon action to obtain a single regular tube solution and argue that the tube is a BPS D2-brane. However, we find that the fluctuation around the tube configuration has a negative-energy mode. This means that the tachyon supertube, despite being a BPS configuration, develops an instability in the pathological spacetime with closed timelike curve which violates the causality. E-mail: [email protected]
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