BPS Dyons, Wall Crossing and Borcherds Algebra
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1 Simons Workshop on Geometry and Physics, 2008 BPS Dyons, Wall Crossing and Borcherds Algebra Erik Verlinde University of Amsterdam Based on work with Miranda Cheng
2 Outline N=4 Dyonic Black Holes and Walls of Marginal Stability Hyperbolic Kac Moody Algebra and its Weyl Group Discrete Attractor Flow and Arithmetic Decay Microscopic Description: Borcherds Algebra. 2
3 Heterotic Strings on T Momentum and winding form an even Lorentzian lattice n Given a point on the moduli space one can write 3
4 Heterotic Strings on T The leftmoving sector contains 6 supersymmetry charges. 8 of these annihilate the left-moving ground states. Such states are called /2 BPS states. Their mass equals n Note that Equality holds when, this is an attractor point. 4
5 Heterotic Strings on T Momentum and winding correspond to electric charges 6 Left ground states: /2 BPS states, counting of rightmovers with 5
6 BPS Dyons for Heterotic String on T Electric and magnetic charge 6 /4 BPS states obey Z P,Q = largest eigenvalue of the 4x4 anti-symm. matrix 6
7 Dyonic Black Holes Entropy S-duality S-duality + Parity: SL(2,Z) => PGL(2,Z) 7
8 Attractor Flow At the horizon the moduli reach fixed point. Flow of Narain moduli Flow of axion dilaton 8
9 Walls of Marginal Stability In general one has P Hence, Q At the wall of marginal stability => real co-dimension subspace of moduli space. 9
10 Walls of Marginal Stability From the central charge matrix it follows that at a /4 BPS state may decay in a pair of /2 BPS states Supergravity analysis: bound state is stable when 0
11 Walls of Marginal Stability Other walls are obtained by using that the matrix transforms under PGL(2,Z) as this leads to for the decay
12 The Walls Let us introduce the space of symmetric matrices with norm The locations of the walls can be written as
13 The basis Walls and Weyl Chambers obeys = Cartan matrix of a Generalized Kac Moody algebra Dihedral group of outer automorphisms α 3 α 2 α 2 α 3 α 2 α α α α 3
14 Weyl Group and Chambers Coxeter diagram Weyl chambers can be visualized on Poincare disk
15 Walls and Weyl Chambers 5
16 Discrete Attractor flow Matrix of T-duality invariants => integral weight vector Attractor flow BPS counting jumps at walls 6
17 Decay labeled by pair of fractions (Farey series) Arithmetic Decay s s 3 s s 3 s 2 s 0 0 0
18 Decay labeled by Arithmetic Decay decomposition along root Degeneracy should jump by α α + α
19 Weyl-Kac-Borcherds Formula In addition to real roots there are null and imaginary roots. The product with c determined by the elliptic genus of K3 is a Sp(2,Z)-modular form of weight k =0. 9
20 The Counting Formula The # of dyonic BPS states with charge (P,Q) equals (DVV, 996) Reproduces entropy P Q and has double poles 20
21 Walls in the Space of Contours Hence, the counting formula is contour dependent! The contours are determined by the moduli Poles coincide with walls of Weyl Chambers 2
22 The Wall Crossing Formula The contribution at the pole at v =0 is given by which can be further evaluated to give This describes exactly the contribution due to the decay of /2 BPS bound states! 22
23 Towards Microscopic Description Defining relations of Generalized Kac Moody algebra No representations are known. 23
24 Towards Microscopic Description Weyl-Kac-Borcherds formula counts the degeneracy of highest weight modules The Weyl group acts on the highest weight One can show that for a dominant weight 24
25 Conclusions The occurence of a Hyperbolic KM Algebra understood from supergravity perspective (cf. Cosmic Billiards). Wall crossings are related to Weyl reflections. Microscopic counting in terms of Borcherds Formula incorporates wall crossing through moduli dept. contour. Can one obtain representation of Borcherds Algebra? Counting is more elaborate for non-primitive charges. Can one generalize this to all N=4 theories? Or N=2? 25
26
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