User profiles for Raphaël Douady

Raphael Douady

University Paris 1 Sorbonne
Verified email at univ-paris1.fr
Cited by 1623

[PDF][PDF] Stabilité ou instabilité des points fixes elliptiques

R Douady - Annales scientifiques de l'Ecole normale supérieure, 1988 - numdam.org
J. Moser a démontré qu'un point fixe elliptique d'un difféomorphisme de classe C du plan
préservant les aires est topologiquement stable, moyennant une condition de non …

Mathematical definition, mapping, and detection of (anti) fragility

NN Taleb, R Douady - Quantitative Finance, 2013 - Taylor & Francis
The notions of fragility and antifragility were introduced by Taleb (2012). In short, fragility is
related to how a system suffers from the variability of its environment beyond a certain preset …

Bank regulation, risk and return: Evidence from the credit and sovereign debt crises

…, K Andriosopoulos, R Douady - Journal of banking & …, 2015 - Elsevier
In this paper, we analyze whether regulation reduced risk during the credit crisis and the
sovereign debt crisis for a cross section of global banks. In this regard, we examine distance to …

On probability characteristics of" downfalls" in a standard Brownian motion

R Douady, AN Shiryaev, M Yor - Theory of Probability & Its Applications, 2000 - SIAM
For a Brownian motion $B=(B_t)_{t\le 1}$ with $B_0=0$, {\bf E}$B_t=0$, {\bf E}$B_t^2=t$
problems of probability distributions and their characteristics are considered for the variables $$ …

Financial crisis dynamics: attempt to define a market instability indicator

Y Choi, R Douady - Quantitative Finance, 2012 - Taylor & Francis
The impact of increasing leverage in the economy produces hyperreaction of market
participants to variations of their revenues. If the income of banks decreases, they mass-reduce …

Yield curve smoothing and residual variance of fixed income positions

R Douady - Inspired by Finance: The Musiela Festschrift, 2014 - Springer
We model the yield curve in any given country as an object lying in an infinite-dimensional
Hilbert space, the evolution of which is driven by what is known as a cylindrical Brownian …

The precautionary principle (with application to the genetic modification of organisms)

NN Taleb, R Read, R Douady, J Norman… - arXiv preprint arXiv …, 2014 - arxiv.org
We present a non-naive version of the Precautionary (PP) that allows us to avoid paranoia
and paralysis by confining precaution to specific domains and problems. PP is intended to …

Nombre de rotation des difféomorphismes du cercle et mesures automorphes

R Douady, JC Yoccoz - Regular and Chaotic Dynamics, 1999 - mathnet.ru
Dans cet article, nous d efinissons puis etudions les propri et es des mesures automorphes
sous l'action d'un diff eomorphisme du cercle (cf. d efinition ci-dessous). Nous montrons leur …

[HTML][HTML] Systemic risk indicators based on nonlinear polymodel

X Ye, R Douady - Journal of Risk and Financial Management, 2018 - mdpi.com
The global financial market has become extremely interconnected as it demonstrates strong
nonlinear contagion in times of crisis. As a result, it is necessary to measure financial …

Financial crisis and contagion: A dynamical systems approach

Y Choi, R Douady - Handbook on systemic risk, 2013 - books.google.com
We use a multi-agent-based model to investigate and analyze financial crises where agents
are large aggregates of the economic system under consideration. We analyze financial …