Courant Lecture Notes in Mathematics
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1
2 Stochastic Processes
3 Courant Lecture Notes in Mathematics Executive Editor Jalal Shatah Managing Editor Paul D. Monsour Assistant Editor Reeva Goldsmith
4 S. R. S. Varadhan Courant Institute of Mathematical Sciences 16 Stochasti c Processes Courant Institute of Mathematical Science s New York University New York, New York American Mathematical Societ y Providence, Rhode Island
5 2000 Mathematics Subject Classification. Primar y 60G05, 60G07. For additiona l informatio n an d update s o n thi s book, visi t Library o f Congres s Cataloging-in-Publicatio n Dat a Varadhan, S. R. S. Stochastic processe s / S. R. S. Varadhan. p. cm. (Couran t lectur e note s ; 16 ) Includes bibliographica l reference s an d index. ISBN (alk. paper ) 1. Stochastic processes. I. Title. QA274.V / 3-dc Copying an d reprinting. Individua l reader s o f thi s publication, an d nonprofi t librarie s acting fo r them, ar e permitted t o mak e fai r us e o f the material, suc h a s to cop y a chapter fo r us e in teachin g o r research. Permissio n i s grante d t o quot e brie f passage s fro m thi s publicatio n i n reviews, provide d th e customar y acknowledgmen t o f the sourc e i s given. Republication, systemati c copying, or multiple reproduction o f any material i n this publicatio n is permitte d onl y unde r licens e fro m th e America n Mathematica l Society. Request s fo r suc h permission shoul d b e addressed t o the Acquisition s Department, America n Mathematica l Society, 201 Charle s Street, Providence, Rhod e Islan d , USA. Request s ca n als o b e mad e b y t o reprint-permission@ams.org by the author. Al l rights reserved. Printed i n the Unite d State s o f Th e pape r use d i n thi s boo k i s acid-fre e an d fall s withi n th e guideline s established t o ensur e permanenc e an d durability. Visit th e AM S hom e pag e a t /
6 Dedication To Gopal I had planned to complete this book within a short time of the publication of the volume on probability theory. Bu t the events of September 11, 2001, intervened. We lost our son Gopal that day, a victim of violence in the name of God. I dedicate this volume to his memory.
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8 Contents Preface Chapter 1. Introductio n 1.1. Continuou s Time Processes 1.2. Continuou s Parameter Martingales 1.3. Semimartingale s 1.4. Martingale s and Stochastic Integrals Chapter 2. Processe s with Independent Increments 2.1. Th e Basic Poisson Process 2.2. Compoun d Poisson Processes 2.3. Infinit e Number of Small Jumps 2.4. Infinitesima l Generator s 2.5. Som e Associated Martingales Chapter 3. Poisso n Point Processes 3.1. Poin t Processes 3.2. Poisso n Point Process Chapter 4. Jum p Markov Processes 4.1. Simpl e Examples 4.2. Semigroup s of Operators 4.3. Example : Birth and Death Processes 4.4. Marko v Processes and Martingales 4.5. Explosio n 4.6. Recurrenc e and Transience 4.7. Invarian t Distributions 4.8. Beyon d Explosion Chapter 5. Brownia n Motion 5.1. Definitio n o f Brownian Motion 5.2. Marko v and Strong Markov Property 5.3. Hea t Equation 5.4. Recurrenc e 5.5. Feynman-Ka c Formula 5.6. Arcsin e Law 5.7. Harmoni c Oscillator 5.8. Exi t Times from Bounded Intervals ix vii
9 viii CONTENT S 5.9. Stochasti c Integrals Brownia n Motion with a Drift, Girsano v Fo Ornstein-Uhlenbec k Proces s Invarian t Densities Loca l Times Reflecte d Brownian Motion Excursio n Theory Invarianc e Principle Representatio n of Martingales Chapter 6. One-Dimensiona l Diffusion s 6.1. Stochasti c Differential Equation s 6.2. Propertie s of the Solution 6.3. Connection s with Differential Equation s 6.4. Martingal e Characterizatio n 6.5. Rando m Time Change 6.6. Som e Examples Chapter 7. Genera l Theory of Markov Processes 7.1. Introductio n 7.2. Semigroups, Generators and Resolvents 7.3. Generator s and Martingales 7.4. Invarian t Measures and Ergodic Theory Appendix A. Measure s on Polish Spaces A.l. Th e Space C[0, 1] A.2. Th e Space D[0, 1] Appendix B. Additiona l Remarks Bibliography Index
10 Preface This i s a continuation o f the volume o n probability theor y an d likewis e covers the contents of courses given at the Courant Institute. Thi s volume deals with certain elementary continuous-tim e processes. W e start with a description o f the Poisson process and related processes with independent increments. Afte r a brief look at Markov processes with a finite number of jumps we proceed to study Brownian motion. W e then go on to develop stochastic integrals and Ito's theory in the context of one-dimensional diffusion processes. I t ends with a brief surve y of the general theory of Markov processes.
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13 Bibliography [1] Chung, K. L. Markov chains with stationary transition probabilities. 2nd ed. Die Grundlehren der mathematischen Wissenschaften, 104. Springer, New York, [2] Durrett, R. Stochastic calculus. A practical introduction. Probability an d Stochastic s Series. CRC Press, Boca Raton, Fla., [3] Dynkin, E. B. Markov processes and semi-groups of operators. Teor. Veroyatnost. i Primenen. 1 (1956), [4] Dynkin, E. B. One-dimensional continuous strong Markov processes. Theor. Probability Appl. 4 (1959), [5] Parthasarathy, K. R. Probability measures on metric spaces. Reprint of the 1967 original. AMS Chelsea, Providence, R.I., [6] Stroock, D. W.; Varadhan, S. R. S. Multidimensional diffusion processes. Reprin t of the edition. Classics in Mathematics. Springer, Berlin, [7] Varadhan, S. R. S. Probability theory. Couran t Lectur e Note s i n Mathematics, 7. New Yor k University, Couran t Institut e o f Mathematica l Sciences, Ne w York ; America n Mathematica l Society, Providence, R.I., [8] Wiener, N. Differential space. J. Math. Phys. 2 (1923),
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15 Index C[a, b], 3 D[a, b], 3 arcsine law, 57 Bessel process, 104 birth and death process, 34 Brownian motion, 49 geometric, 100 Markov property, 51 strong Markov property, 51 Chapman-Kolmogorov equations, 29 continuous-parameter martingale, 3 differential equation s and Markov processes, 94 Doob decomposition, 8 Doob's h-transform, 10 5 Doob's inequality, 4 Doob-Meyer decomposition, 8 Dynkin's formula, 11 0 excursion theory, 81 exit distribution, 36 exit time, 36 distribution, 60 explosion, 39, 71, 102 Feller's test, 10 2 Feynman-Kac formula, 5 6 filtration, 3 generator, 31 Girsanov formula, 6 9 harmonic oscillator, 59 heat equation, 53 infinitesimal generator, 20, 31 invariant distribution, 45, 75, 111 Ito's formula, 66 for stochastic integrals, 91 jump Markov process, 29 and strong Markov property, 32 Levy-Khintchine representation, 1 8 life after death, 47 local time, 76 martingale, 3, 22 exponential martingale, 23, 68 martingale problem, 97 one-dimensional diffusions, 8 7 option pricing, 101 optional stopping, 5, 6 Ornstein-Uhlenbeck process, 72 outer measure, 2 point process, 25 marked, 27 Poisson, 26 Poisson process, 13 compound, 1 6 rate, 15 Poisson random measure, 26 processes with independent increments, 17 quadratic variation, 61 random time change, 99 recurrence, 55 reflected Brownian motion, 79 reflection principle, 52 regularity C[0, 1], 116 D[0, 1], 118 semigroup, 20, 31 semimartingale, 8 stable laws, 19
16 126 stochastic differential equatio n existence of, 8 7 properties of solutions of, 9 0 uniqueness of, 8 7 stochastic integration, 10, 61 stochastic process, 1 stopped field, 4 stopping time, 4 submartingale, 4 supermartingale, 4 Tulceas' theorem, 30 Wiener's stochastic integral, 62
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