By Bernard D'Espagnat

Qu'est-ce que los angeles réalité?

Le physicien Bernard d'Espagnat aborde ici l. a. query du "réel", défendant l'idée qu'il serait intellectuellement discutable de prétendre l. a. traiter sans tenir compte des leçons de los angeles body moderne. Il apporte l'éclairage de los angeles philosophie classique, et celui de l. a. technological know-how contemporaine. Ce livre est donc une brillante initiation aux problématiques de l. a. body, technological know-how qui entre toutes a connu récemment les plus grands bouleversements.

"Alors que j'étais étudiant à l'École centrale, un ami m'offrit À los angeles recherche du réel, qui venait de paraître. Je le dévorais aussitôt en annotant chacune de ses pages." Etienne Klein.

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5in ws-book975x65 Multi-Facets Of QCD In Matter 13 chiral ﬁeld U remains unchanged by the local transformation h(x) ∈ SU (Nf )L+R ξL,R → h(x)ξL,R . 4) The original chiral theory in terms of U ﬁeld can be made a gauge theory by introducing “hidden” gauge ﬁelds AµL,R . This gives rise to hidden local symmetry theory of Harada and Yamawaki [Harada and Yamawaki 2003] which makes up one of the principal parts of what is discussed in this volume. Now as mentioned above, symmetry arguments alone can lead to an arbitrary theory when one goes up in scale.

Thus for long-wavelength processes, a gauge closer to ∆ = 1 could be more eﬃcient in capturing the strong interaction physics whereas processes sampling short distances would do better with gauge choices closer to ∆ = 0. 20), consider how the baryon charge “leaks” out of the bag into the meson sector in two dimensions where the CCP can be formulated exactly. This gives us a general idea how the principle works. Later we will make a leap to reality in four dimensions and mention how much one can take over from the (1+1) case.

16) where the ﬁrst term in curly bracket comes from the shift in θ and the second term from the Fujikawa measure. 17). 5in ws-book975x65 Chiral Nuclear Dynamics II One can go further and take ∆ to be a local function. In this case, one can continuously change representation from one region of space-time to another, choosing diﬀerent gauge ﬁxing conditions in diﬀerent space-time regions. This leads to a smooth Cheshire bag. 20) with z = rˆR. The usual bag boundary conditions employed in phenomenological studies arise after certain suitable averaging over part of the space and, hence, are a speciﬁc realization of the Cheshire Cat scheme.