NON CUBED · Towards a non-critical non-AdS/non-CFT correspondence
6РП — Действия „Мария Кюри“
- Период
- 2006-01-01 → 2007-08-31
- Финансиране от ЕС
- 151 982 €
- Участници
- 1
- Схема
- EIF
Линиите свързват координатора с партньорите.
Накратко на български
Взаимодействията между кварците при ниски енергии се изучават чрез модела на струнната теория. Това помага за по-доброто разбиране на силно свързаните полеви теории, които са трудни за описание с традиционните методи в ядрената физика.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - NON CUBED (Towards a non-critical non-AdS/non-CFT correspondence)
Quarks constitute the fundamental building blocks of nuclear matter. Despite their pervasiveness, though, a complete description of their interactions at low energies, which are relevant for subnuclear and nuclear interactions, is still missing. This short-coming is mainly due to the fact that at such low energies, these interactions are very strong and a standard perturbative field theory description is not suitable. Over the years various proposals have been put forward to tackle this central problem. One of the most promising and far reaching one is the string/gauge correspondence. Oversimplifying, this correspondence proposes to describe strongly coupled field theories via a dual formulation in terms of a weakly coupled, and therefore at least in principle more manageable, string theory. Throughout the whole project, the fellow has achieved, in collaboration with a small group of local and foreign researchers, to improve the present understanding of this correspondence focusing on the description of the dynamics of flavoured degrees of freedom (i.e. quarks). In particular, he has participated in the development of a procedure to include the effect of many flavours (of supersymmetric theories) on the dual string theory background. Solving this problem has required understanding the effect of a set of additional D-branes on a previously known background, and the ability to recognise the essential features of the model to focus on the relevant aspects of the system. This has allowed him and his collaborators to reproduce, in an original way, many interesting field theory phenomena in terms of the newly built dual string theory solutions. Such phenomena depend essentially on the number of quark flavours being the same order as the number of colour degrees of freedom. Their work constitutes therefore an important step forward in the understanding of the string/gauge correspondence in general, and in its applicability to the study of phenomenologically interesting field theories, in particular.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
In the last few years many important successes have been achieved in the understanding of string theory and its relation to large N gauge theories. The AdS-CFT proposal is the best understood example of such holographic dualities. Since its original propos al, many steps have been taken to extend this duality and build the string theory dual of (large N) QCD, but a satisfactory and complete model is still a long way to come. It is plausible that the dual of QCD involves a non-critical five-dimensional string theory. Compared to critical ten-dimensional theories, not much is known about non-critical strings, and only recently the extension of AdS-CFT to the non-critical case has been considered. The aim of the present project is to gain a deeper understanding in the duality between non-critical strings and four-dimensional gauge theories. Studying non-critical AdS-CFT will require understanding the way non-critical string theory behaves in the presence of background RR fluxes. This is an essential feature of al l dual string theories because D-branes (which sustain gauge and flavor degrees of freedom) are sources for RR-fields. Moreover, non-critical AdS-CFT will have to deal with stringy effects since the characteristic size of the backgrounds involved is of the same order as the string length. To this purpose, it will be very interesting to use the duality and known results on superconformal gauge theories to gain insights into string dynamics. We will also consider the breaking of the field theory conformal inv ariance: while at a first stage this symmetry proves to be very useful to constrain the dynamics of the system under consideration, QCD is not conformally invariant. In particular we will be interested in the effect on the string background, of D-branes ca rrying flavor degrees of freedom. We know that in general the presence of matter breaks conformal invariance of the gauge theory. This should be described by the back-reaction of flavor branes.
Оригинален текст от CORDIS (на английски).
Участници
- CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE · PARISКоординаторФранция
Връзки
Данни: CORDIS, © Европейски съюз