Infrared dynamics of a large N QCD model, the massless string sector and mesonic spectra

Journal Article · Thu Jul 23 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP07(2015)122· OSTI ID:1454532

Dasgupta, Keshav ^[1]; Gale, Charles ^[1]; Mia, Mohammed ^[2]; Richard, Michael ^[1]; Trottier, Olivier ^[1]

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1. McGill Univ., Montreal, QC (Canada). Physics Dept.
2. Purdue Univ., West Lafayette, IN (United States). Dept. of Physics

A consistency check for any UV complete model for large N QCD should be, among other things, the existence of a well-defined vector and scalar mesonic spectra. In this paper, we use our UV complete model in type IIB string theory to study the IR dynamics and use this to predict the mesonic spectra in the dual type IIA side. The advantage of this approach is two-fold: not only will this justify the consistency of the supergravity approach, but it will also give us a way to compare the IR spectra and the model with the ones proposed earlier by Sakai and Sugimoto. Interestingly, the spectra coming from the massless stringy sector are independent of the UV physics, although the massive string sector may pose certain subtleties regarding the UV contributions as well as the mappings to actual QCD. Additionally, we find that a component of the string landscape enters the picture: there are points in the landscape where the spectra can be improved somewhat over the existing results in the literature. These points in the landscape in-turn also determine certain background supergravity components and fix various pathologies that eventually lead to a consistent low energy description of the theory.

• Research Organization: Purdue Univ., West Lafayette, IN (United States); McGill Univ., Montreal, QC (Canada)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); Natural Sciences and Engineering Research Council of Canada (NSERC); Fonds de recherche du Québec - Nature et technologies (FRQNT) (Canada)
• Grant/Contract Number: SC0007884
• OSTI ID: 1454532
• Journal Information: Journal of High Energy Physics (Online), Vol. 2015, Issue 7; ISSN 1029-8479
• Publisher: Springer Berlin
• Country of Publication: United States
• Language: English

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