On stochastic calculus related to financial assets without semimartingales

Rosanna Coviello, Cristina Di Girolami and Francesco Russo
july, 2011
Publication type:
Paper in peer-reviewed journals
Bulletin Sciences Mathématiques, vol. 135, pp. 733–774
images/icons/icon_arxiv.png 1102.2050
Keywords :
$A$-martingale; weak $k$-order Brownian motion; no-semimartingale; utility maximization; insider; no-arbitrage; viability; hedging
This paper does not suppose a priori that the evolution of the price of a financial asset is a semimartingale. Since possible strategies of investors are self-financing, previous prices are forced to be finite quadratic variation processes. The non-arbitrage property is not excluded if the class $A$ of admissible strategies is restricted. The classical notion of martingale is replaced with the notion of $A$-martingale. A calculus related to $\sha$-martingales with some examples is developed. Some applications to no-arbitrage, viability, hedging and the maximization of the utility of an insider are expanded. We finally revisit some no arbitrage conditions of Bender-Sottinen-Valkeila type.
    author={Rosanna Coviello and Cristina Di Girolami and Francesco Russo },
    title={On stochastic calculus related to financial assets without 
           semimartingales },
    doi={10.1016/j.bulsci.2011.06.008 },
    journal={Bulletin Sciences Mathématiques },
    year={2011 },
    volume={135 },