The perturbed static path approximation at finite temperature: observables and strength functions
نویسندگان
چکیده
منابع مشابه
The Perturbed Static Path Approximation at Finite Temperature: Observables and Strength Functions
We present an approximation scheme for calculating observables and strength functions of finite fermionic systems at finite temperature such as hot nuclei. The approach is formulated within the framework of the HubbardStratonovich transformation and goes beyond the static path approximation and the RPA by taking into account small amplitude time-dependent fluctuations around each static value o...
متن کاملBeyond the perturbed static path approximation (PSPA)
Based on the path integral approach the partition function of a many body system with separable two body interaction is calculated in the sense of a semiclassical approximation. The commonly used Gaussian type of approximation, known as the perturbed static path approximation (PSPA), breaks down near a crossover temperature due to instabilities of the classical mean field solution. It is shown ...
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Based on the path integral representation of the partition function of a many body system with separable two body interaction we propose a systematic extension of the perturbed static path approximation (PSPA) to lower temperatures. Thereby, special attention must be paid to instabilities of the classical mean field solution in functional space that cause divergencies within the conventional PS...
متن کاملSelf-consistent quantal treatment of decay rates within the perturbed static path approximation.
The framework of the perturbed static path approximation is used to calculate the partition function of a finite Fermi system from a Hamiltonian with a separable two body interaction. Therein, the collective degree of freedom is introduced in self-consistent fashion through a Hubbard-Stratonovich transformation. In this way, all transport coefficients that dominate the decay of a metastable sys...
متن کاملMesons Spectral Functions at Finite Temperature
We investigate the thermal spectral densities for (pseudo)scalar and vector currents in the framework of the real time formalism when mass of two quarks are different. Such spectral densities are necessary for the phenomenological investigation of in-medium properties of hadrons. We use the quark propagator at finite temperature and calculate annihilation and scattering parts of spectral densit...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 1997
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(97)00486-7