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We study the Giddings–Strominger wormholes in string theories. We found a non–singular wormhole solution and analyzed the perturbation around this wormhole solution. We have used the bilinear action to obtain Schrödinger– type equation for perturbation fields assuming a linear relation between the perturbation fields. With this analysis, we found an infinite number of negative modes among O(4)–...
متن کاملThe Physics of Negative Absolute Temperatures
Negative absolute temperatures were introduced into experimental physics by Purcell and Pound, who successfully applied this concept to nuclear spins; nevertheless the concept has proved controversial : a recent article aroused considerable interest by its claim, based on a classical entropy formula (the ‘volume entropy’) due to Gibbs, that negative temperatures violated basic principles of sta...
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A considerable body of experimental and theoretical work claims the existence of negative absolute temperatures in spin systems and ultra-cold quantum gases. Here, we clarify that such findings can be attributed to the use of a popular yet inconsistent entropy definition, which violates fundamental thermodynamic relations and fails to produce sensible results for simple analytically tractable c...
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ژورنال
عنوان ژورنال: Modern Physics Letters A
سال: 2006
ISSN: 0217-7323,1793-6632
DOI: 10.1142/s0217732306019839