This paper characterizes the arbitrage-free dynamics of interest rates, in the presence of both jumps and diffusion, when the term structure is modeled through simple forward rates (i.e., through discretely compounded forward rates evolving continuously in time) or forward swap rates. Whereas instantaneous continuously compounded rates form the basis of most interest rate models, simply compounded rates and their parameters are more directly observable in practice. We consider very general types of jump processes, allowing randomness in jump sizes and dependence between jump sizes, jump times, and interest rates. We also formulate reasonably tractable subclasses of models and provide pricing formulas for some derivative securities, including interest rate caps and options on swaps. Through these formulas, we illustrate the effect of jumps on implied volatilities in interest rate derivatives. We also discuss computational methods for pricing more complex instruments. This is joint work with Steve Kou.
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