Status  Confirmed 
Seminar Series  RENCTHEO 
Subjects  hepth 
Date  Thursday 15 November 2018 
Time  10:00 
Institute  IHP 
Seminar Room  201 
Speaker's Last Name  O'bannon 
Speaker's First Name  Andy 
Speaker's Email Address  
Speaker's Institution  University of Southampton 
Title  Wilson Surface Central Charge 
Abstract  Mtheory is currently our best candidate for a theory of everything, but remains mysterious. We know Mtheory has M2 and M5branes. The lowenergy theory on a stack of coincident M2branes is wellunderstood: it is maximally supersymmetric ChernSimonsmatter theory. However, the lowenergy theory on a stack of coincident M5branes remains poorlyunderstood: it is a maximally supersymmetric theory of selfdual strings with zero tension. In this talk I will discuss one type of probe of the M5brane theory, namely selfdual strings with infinite tension. These play a role analogous to Wilson lines in gauge theories, but are twodimensional surfaces rather than lines, and hence are called Wilson surfaces. I will describe holographic calculations of entanglement entropy associated with these infinitetension selfdual strings, from which we extract a key parameter characterizing them, their central charge. This provides a count of the number of massless degrees of freedom living on them, and thus may shed light on some of the fundamental degrees of freedom of Mtheory. 
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