scholarly journals Exponential BPS Graphs and D Brane Counting on Toric Calabi-Yau Threefolds: Part I

2021 ◽  
Author(s):  
Sibasish Banerjee ◽  
Pietro Longhi ◽  
Mauricio Romo
Keyword(s):  
Wall Crossing ◽  
Bps Invariants ◽  
Bps States ◽  
Exponential Networks

AbstractWe study BPS spectra of D-branes on local Calabi-Yau threefolds $$\mathcal {O}(-p)\oplus \mathcal {O}(p-2)\rightarrow \mathbb {P}^1$$ O ( - p ) ⊕ O ( p - 2 ) → P 1 with $$p=0,1$$ p = 0 , 1 , corresponding to $$\mathbb {C}^3/\mathbb {Z}_{2}$$ C 3 / Z 2 and the resolved conifold. Nonabelianization for exponential networks is applied to compute directly unframed BPS indices counting states with D2 and D0 brane charges. Known results on these BPS spectra are correctly reproduced by computing new types of BPS invariants of 3d-5d BPS states, encoded by nonabelianization, through their wall-crossing. We also develop the notion of exponential BPS graphs for the simplest toric examples, and show that they encode both the quiver and the potential associated to the Calabi-Yau via geometric engineering.

scholarly journals Local BPS Invariants: Enumerative Aspects and Wall-Crossing

2018 ◽  
Vol 2020 (17) ◽  
pp. 5450-5475 ◽  
Author(s):  
Jinwon Choi ◽  
Michel van Garrel ◽  
Sheldon Katz ◽  
Nobuyoshi Takahashi
Keyword(s):  
Projective Space ◽  
Euler Characteristic ◽  
Moduli Spaces ◽  
Del Pezzo Surfaces ◽  
Arithmetic Genus ◽  
One Dimensional ◽  
Wall Crossing ◽  
Bps Invariants ◽  
Del Pezzo ◽  
Dimensional Projective Space

Abstract We study the BPS invariants for local del Pezzo surfaces, which can be obtained as the signed Euler characteristic of the moduli spaces of stable one-dimensional sheaves on the surface $S$. We calculate the Poincaré polynomials of the moduli spaces for the curve classes $\beta $ having arithmetic genus at most 2. We formulate a conjecture that these Poincaré polynomials are divisible by the Poincaré polynomials of $((-K_S).\beta -1)$-dimensional projective space. This conjecture motivates the upcoming work on log BPS numbers [8].

scholarly journals BPS States, Crystals, and Matrices

2011 ◽  
Vol 2011 ◽  
pp. 1-52 ◽  
Author(s):  
Piotr Sułkowski
Keyword(s):  
Matrix Model ◽  
Topological String ◽  
Model Representation ◽  
Free Fermion ◽  
Wall Crossing ◽  
Melting Crystal ◽  
Bps States ◽  
String Amplitudes ◽  
Calabi Yau Manifolds

We review free fermion, melting crystal, and matrix model representations of wall-crossing phenomena on local, toric Calabi-Yau manifolds. We consider both unrefined and refined BPS counting of closed BPS states involving D2- and D0-branes bound to a D6-brane, as well as open BPS states involving open D2-branes ending on an additional D4-brane. Appropriate limit of these constructions provides, among the others, matrix model representation of refined and unrefined topological string amplitudes.

scholarly journals Refined large N duality for knots

2020 ◽  
pp. 2041001
Author(s):  
Masaya Kameyama ◽  
Satoshi Nawata
Keyword(s):  
Moduli Spaces ◽  
Bound States ◽  
Simons Theory ◽  
Global Symmetry ◽  
Torus Knots ◽  
Torus Knot ◽  
Large N ◽  
Bps Invariants ◽  
Bps States ◽  
Chern Simons

We formulate large [Formula: see text] duality of [Formula: see text] refined Chern–Simons theory with a torus knot/link in [Formula: see text]. By studying refined BPS states in M-theory, we provide the explicit form of low-energy effective actions of Type IIA string theory with D4-branes on the [Formula: see text]-background. This form enables us to relate refined Chern–Simons invariants of a torus knot/link in [Formula: see text] to refined BPS invariants in the resolved conifold. Assuming that the extra [Formula: see text] global symmetry acts on BPS states trivially, the duality predicts graded dimensions of cohomology groups of moduli spaces of M2–M5 bound states associated to a torus knot/link in the resolved conifold. Thus, this formulation can be also interpreted as a positivity conjecture of refined Chern–Simons invariants of torus knots/links. We also discuss about an extension to non-torus knots.

scholarly journals CONSTRUCTIVE WALL-CROSSING AND SEIBERG–WITTEN

2013 ◽  
Vol 28 (03n04) ◽  
pp. 1340005
Author(s):  
PILJIN YI
Keyword(s):  
Bound State ◽  
Low Energy ◽  
Marginal Stability ◽  
Energy Dynamics ◽  
Principle Solution ◽  
Wall Crossing ◽  
Rational Invariant ◽  
Equivariant Version ◽  
Bps States ◽  
Diagonal Subgroup

We outline a comprehensive and first-principle solution to the wall-crossing problem in D = 4N = 2 Seiberg–Witten theories. We start with a brief review of the multi-centered nature of the typical BPS states and of how this allows them to disappear abruptly as parameters or vacuum moduli are continuously changed. This means that the wall-crossing problem is really a bound state formation/dissociation problem. A low energy dynamics for arbitrary collections of dyons is derived, with the proximity to the so-called marginal stability wall playing the role of the small expansion parameter. We discover that the low energy dynamics of such BPS dyons cannot be reduced to one on the classical moduli space, [Formula: see text], yet the index can be phrased in terms of [Formula: see text]. The so-called rational invariant, first seen in Kontsevich–Soibelman formalism of wall-crossing, is shown to incorporate Bose/Fermi statistics automatically. Furthermore, an equivariant version of the index is shown to compute the protected spin character of the underlying D = 4N = 2 theory, where [Formula: see text] isometry of [Formula: see text] is identified as a diagonal subgroup of rotation SU(2)L and R-symmetry SU(2)R.

scholarly journals CRYSTAL MELTING AND WALL CROSSING PHENOMENA

2011 ◽  
Vol 26 (07n08) ◽  
pp. 1097-1228 ◽  
Author(s):  
MASAHITO YAMAZAKI
Keyword(s):  
Partition Function ◽  
Mechanical Model ◽  
Topological String ◽  
Planck Scale ◽  
Topological String Theory ◽  
Crystal Melting ◽  
Wall Crossing ◽  
Statistical Mechanical Model ◽  
Statistical Mechanical ◽  
Bps States

This paper summarizes recent developments in the theory of Bogomol'nyi–Prasad–Sommerfield (BPS) state counting and the wall crossing phenomena, emphasizing in particular the role of the statistical mechanical model of crystal melting. This paper is divided into two parts, which are closely related to each other. In the first part, we discuss the statistical mechanical model of crystal melting counting BPS states. Each of the BPS states contributing to the BPS index is in one-to-one correspondence with a configuration of a molten crystal, and the statistical partition function of the melting crystal gives the BPS partition function. We also show that smooth geometry of the Calabi–Yau manifold emerges in the thermodynamic limit of the crystal. This suggests a remarkable interpretation that an atom in the crystal is a discretization of the classical geometry, giving an important clue as such to the geometry at the Planck scale. In the second part, we discuss the wall crossing phenomena. Wall crossing phenomena states that the BPS index depends on the value of the moduli of the Calabi–Yau manifold, and jumps along real codimension one subspaces in the moduli space. We show that by using type IIA/M-theory duality, we can provide a simple and an intuitive derivation of the wall crossing phenomena, furthermore clarifying the connection with the topological string theory. This derivation is consistent with another derivation from the wall crossing formula, motivated by multicentered BPS extremal black holes. We also explain the representation of the wall crossing phenomena in terms of crystal melting, and the generalization of the counting problem and the wall crossing to the open BPS invariants.

scholarly journals 5D BPS quivers and KK towers

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Zhihao Duan ◽  
Dongwook Ghim ◽  
Piljin Yi
Keyword(s):  
Weak Coupling ◽  
Fine Tuning ◽  
Simple Hypothesis ◽  
Mathematical Theorem ◽  
Wall Crossing ◽  
Bps States

Abstract We explore BPS quivers for D = 5 theories, compactified on a circle and geometrically engineered over local Calabi-Yau 3-folds, for which many of known machineries leading to (refined) indices fail due to the fine-tuning of the superpotential. For Abelian quivers, the counting reduces to a geometric one, but the technically challenging L2 cohomology proved to be essential for sensible BPS spectra. We offer a mathematical theorem to remedy the difficulty, but for non-Abelian quivers, the cohomology approach itself fails because the relevant wavefunctions are inherently gauge-theoretical. For the Cartan part of gauge multiplets, which suffers no wall-crossing, we resort to the D0 picture and reconstruct entire KK towers. We also perform numerical checks using a multi-center Coulombic routine, with a simple hypothesis on the quiver invariants, and extend this to electric BPS states in the weak coupling chamber. We close with a comment on known Donaldson-Thomas invariants and on how L2 index might be read off from these.

scholarly journals Wall-crossing invariants: from quantum mechanics to knots

2015 ◽  
Vol 120 (3) ◽  
pp. 549-577 ◽  
Author(s):  
D. Galakhov ◽  
A. Mironov ◽  
A. Morozov
Keyword(s):  
Quantum Mechanics ◽  
Wall Crossing
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