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Nash Equilibria in a class of Markov stopping games

This work concerns a class of discrete-time, zero-sum games with two players and Markov transitions on a denumerable space. At each decision time player II can stop the system paying a terminal reward to player I and, if the system is no halted, player I selects an action to drive the system and receives a running reward from player II. Measuring the performance of a pair of decision strategies by the total expected discounted reward, under standard continuity-compactness conditions it is shown...

Real-valued conditional convex risk measures in (ℱ)

Treviño-Aguilar Erick — 2011

ESAIM: Proceedings

The numerical representation of convex risk measures beyond essentially bounded financial positions is an important topic which has been the theme of recent literature. In other direction, it has been discussed the assessment of essentially bounded risks taking explicitly new information into account, i.e., conditional convex risk measures. In this paper we combine these two lines of research. We discuss the numerical representation of conditional...

Bounds of Ruin Probabilities for Insurance Companies in the Presence of Stochastic Volatility on Investments

Mohamed BadaouiBegoña Fernández — 2011

ESAIM: Proceedings

In this work we consider a model of an insurance company where the insurer has to face a claims process which follows a Compound Poisson process with finite exponential moments. The insurer is allowed to invest in a bank account and in a risky asset described by Geometric Brownian motion with stochastic volatility that depends on an external factor modelled as a diffusion process. By using exponential martingale techniques we obtain upper and lower...

Random Walks and Trees

Zhan Shi — 2011

ESAIM: Proceedings

These notes provide an elementary and self-contained introduction to branching random walks. Section 1 gives a brief overview of Galton–Watson trees, whereas Section 2 presents the classical law of large numbers for branching random walks. These two short sections are not exactly indispensable, but they introduce the idea of using size-biased trees, thus giving motivations and an avant-goût to the main part, Section 3, where branching random ...

Existence and uniqueness to the Cauchy problem for linear and semilinear parabolic equations with local conditions

Gerardo Rubio — 2011

ESAIM: Proceedings

We consider the Cauchy problem in ℝ d for a class of semilinear parabolic partial differential equations that arises in some stochastic control problems. We assume that the coefficients are unbounded and locally Lipschitz, not necessarily differentiable, with continuous data and local uniform ellipticity. We construct a classical solution by approximation with linear parabolic equations....

Fluctuation limit theorems for age-dependent critical binary branching systems

José Alfredo López-MimbelaAntonio Murillo-Salas — 2011

ESAIM: Proceedings

We consider an age-dependent branching particle system in ℝ, where the particles are subject to -stable migration (0 <  ≤ 2), critical binary branching, and general (non-arithmetic) lifetimes distribution. The population starts off from a Poisson random field in ℝ with Lebesgue intensity. We prove functional central limit theorems and strong laws of large numbers under two rescalings: high particle density, and a space-time rescaling...

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