Time-Changed Bessel Processes and Credit Risk

Details Time-Changed Bessel Processes and Credit Risk Time-Changed Bessel Processes and Credit Risk

2006-04-13

arxiv.org/abs/math/0604305v1

Mathematics

Probability

Scientific paper

The Constant Elasticity of Variance (CEV) model is mathematically presented and then used in a Credit-Equity hybrid framework. Next, we propose extensions to the CEV model with default: firstly by adding a stochastic volatility diffusion uncorrelated from the stock price process, then by more generally time changing Bessel processes and finally by correlating stochastic volatility moves to the stock ones. Properties about strict local and true martingales in this study are discussed. Analytical formulas are provided and Fourier and Laplace transform techniques can then be used to compute option prices and probabilities of default.

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