在1997年Maldacena提出著名的AdS/CFT猜测后弦论与规范场的对偶成为弦论研究的核心课题。Klebanov-Strassler，Maldacena-Nunez 分别找到了两个新的解，猜测他们是N=2，1 SYM的超引力对偶。我们通过D5 branes probes, 在Maldacena-Nunez背景下引入了物质场。这项工作得到该领域的广泛认可。

Sen Hu (with Wang Xiao Jun), Intersecting branes and adding flavors to the Maldacena-Nunez background, JHEP 0309 (2003) 017. 

在Johanna Erdmenger, Nick Evans, Ingo Kirsch and Ed Threlfall, Mesons in Gauge/Gravity Duals A Review (arxiv0711.4467)里介绍我们的工作：The Maldacena-Nu˜nez background [124] is dual to an N = 1 theory on the world-volume of a D5 brane wrapped on a 2-sphere and therefore describes a relative of N = 1 Yang Mills theory with additional Kaluza Klein modes. The dual encodes the condensation of gauginos and the N discrete vacua of the theory. Probe D5 branes have been used to introduce matter fields into this theory with N = 1 supersymmetry preserved in [125]（上文） [126].

Sen Hu (with Wang Xiao Jun), Green Functions of N=1 SYM and Radial/Energy-Scale Relation, hep-th/0210041, Physical Review D67 (2003) 105012. 

Carlos N´u˜nez, Angel Paredes and Alfonso V. Ramallo：Flavoring the gravity dual of N = 1 Yang-Mills with probes (hep-th, 0311201, p27), The way of adding fundamental fields in this gauge theory from a string theory perspective was discussed in [28] （上文）, where two possible ways, adding D9 branes or adding D5 branes as probes, were proposed.

Sen Hu, Kuozhen Wu, Entanglement Entropy of $AdS_{5} \times S^{5}$ with massive flavors, MODERN PHYSICS LETTERS A, Vol. 33(1), 2018. 

David Dudala, Subhash Mahapatra, Thermal entropy of a quark-antiquark pair above and below deconfinement from a dynamical holographic QCD model (arXiv 1708.0699).