By M.-J. Giannoni, A. Voros, J. Zinn-Justin

Within the final decade the certainty of the kin among classical and quantum mechanics has complex greatly and the next wide subject matters are handled during this book:-

• random matrices: a resurgence of an outdated conception introduced in from nuclear physics, now the normal for analysing "signatures" of classical chaos in quantum systems;

• the complicated quantum behaviour of pushed Hamiltonian platforms and localization phenomena;

• chaos in scattering platforms and the houses of S -matrices;

• spectra of quantum platforms whose classical analogues are the geodesic flows on negatively curved compact manifolds;

• the wealth of homes of wave capabilities for classically chaotic systems;

• the increase and development of the idea that of chaos in all sectors of "physics of microscopic media": nuclear, atomic, molecular, solid-state physics.

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S t a r s i n t h e s e t d e n o t e d a s Clo Η a r e m a r k e d w i t h " x " ' s i n F i g . 2 , w h i l e stars in the set d e n o t e d a s C l o Mg a r e m a r k e d w i t h t h i c k d o t s . A look at Fig. 2 shows that the s t a r s which gave Clo Η a r e in a different region than the s t a r s w h i c h g a v e C l o Mgr. T h i s p i c t u r e i s i n f a v o u r o f a h y p o t h e s i s presented i n / 5 / a c c o r d i n g t o w h i c h t h e Sun i s embedded i n a v e r y s m a l l c l o u d 3 t o 5 pc 45 Matter Flow in the Solar Neighbourhood in radius, extending in a l l d i r e c t i o n s .

The f l o w i n t h e i m m e d i a t e s o l a r n e i g h b o u r h o o d seems to agree with the r e s u l t s of the backscattered s o l a r r a d i a t i o n a n a l y s i s , while t h e f l o w of more d i s t a n t gas, although f a r from b e i n g homogeneous, is in a g r e e m e n t w i t h t h e C r u t c h e r / l / m o d e l . Thus t h e h y p o t h e s i s of t h e Sun embedded i n a l o c a l c l o u d seems c o n f i r m e d . The l o c a l c l o u d ' s v e l o c i t y w i t h respect t o an ambient i n t e r s t e l l a r medium w h i c h moved w i t h t h e C r u t c h e r v e c t o r would be ν ä 10 k m / s , 1 m 7 0 ° and b ^ - 1 0 ° .

Need f o r extreme c a r e when interpreting the kinematics of p o s s i b l e nearby i n t e r s t e l l a r clouds i s stressed. INTRODUCTION In r e c e n t y e a r s a number of s t u d i e s h a v e b e e n c o n d u c t e d on t h e interstellar matter density distribution and f l o w in t h e s o l a r neighbourhood (for review see / 2 , 3 , 4 , 5 / ) . Various experimental t e c h n i q u e s have been u s e d , and a p i c t u r e of the local i n t e r s t e l l a r medium has been c o n s t r u c t e d .

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