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CartaFederico .pdf


Original filename: CartaFederico.pdf
Title: Hilbert Series and Mixed Branches of 3d, N=4 T[SU(N)] theory
Author: Federico Carta.

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Hilbert Series and Mixed Branches of 3d, N = 4
T [SU (N )] theory
Federico Carta.
IFT-UAM/CSIC

16th of January 2017

Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

1 / 17

Based on...

F.C., Hirotaka Hayashi. 2015

Related background work:
Dan Xie, Kazuya Yonekura. 2014
Oscar Chacaltana, Jacques Distler, Yuji Tachikawa. 2012
Davide Gaiotto, Edward Witten. 2008

Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

2 / 17

Moduli Spaces of SUSY QFTs.

In general the vacuum state of a QFT is not unique.
Physics is different when the QFT lives on a different vacuum.
Define the Moduli Space as the set of gauge inequivalent vacua.
M = {all vacua}/G
Label different vacua by the vevs of the scalars.
Geometrically M is an algebraic variety.
Interesting object to study to understand IR dynamics of a QFT.

Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

3 / 17

Moduli spaces for theories with 8 supercharges.
In general classical M =
6 quantum M. Quantum corrections.
To make the problem easier, consider the subset of SUSY QFTs.
4d QFT theory with 8 supercharges. (4d N = 2)
We have the following multiplets:
˜ = (qα , ϕ, q˜ ˙ , σ)
Hypermultiplet. X = (Q, Q)
β
Vector multiplet. V = (VN =1 , Φ) = (Aµ , ψα , λβ , φ)
Moduli space splits into different zones, depending on which scalar
takes a non-zero vev.

Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

4 / 17

Generic Features of 3d N = 4.

Perform a dimensional reduction of the 4d N = 2 theory.
Ai is dual to a real scalar γ. Dual photon.
γ can take vev.
Coulomb branch is enlarged compared to 4d N = 2.
∗F = J is a conserved current. Extra U (1)J hidden symmetry
U (1)J acts on γ by shifts γ → γ + a
Parametrize the directions opened up by hγi by the vev of BPS
monopole operators: disorder operators semiclassically given by
( σ +iγ)
V ∼ e g2

Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

5 / 17

Higgs branch VS Coulomb branch.
Higgs branch

Coulomb branch

Parametrized only by vevs of
hypermultiplets.

Parametrized only by vevs of
vector multiplets (via
monopole operators.)

Hyperkahler variety H.

Hyperkahler variety C.

Classically exact.

Heavy quantum corrections
deform the geometry.

Gauge group generically
completely broken.

Gauge group generically
broken to U (1)r .

3d Mirror Symmetry swaps the two branches.
Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

6 / 17

Mixed branches.
Parametrized by both vevs of
hypers and vectors.
Mi ' Hi × Ci
Needed to have a full picture
of the moduli space.
[
[
M=
Mi =
Hi × C i
i

i

Clearly not disjoint union:
generically Mi ∩ Mj 6= ∅.
Taken from Argyres ’98
Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

7 / 17

Hilbert Series as a tool to study the Moduli Space.
Correspondence between holomorphic maps on M and the chiral
ring of BPS operator.
Counting the BPS chiral operators in a graded way.
Use the Hilbert series as a counting tool. In general
X
HS(t) =
an tn
n

For the full Coulomb branch we have
X
HG (t, z) =
z J(m) t∆(m) PG (t, m)
m∈Γ∗ˆ /WG
ˆ
G

The conformal dimension of monopole operators is
∆(m) = −

n
1X X
|α(m)| +
|ρi (m)|
2
+

X
α∈∆

i=1 ρi ∈Ri

Hanany, Cremonesi, Zaffaroni ’13
Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

8 / 17

T [SU (N )] theory, as a quiver gauge theory.

1

2

3

N

Circles represent gauge U (Ni ) factors of the gauge group.
The square represents a flavour SU (N ) group.
Lines represent bifundamental hypermultiplets.
The lagrangian in 3d N = 4 is fully determined by the matter
content.
The quiver defines in a unique way the theory.

Federico Carta. (IFT-UAM/CSIC)

HS and mixed branches of T SU (N )

16th of January 2017

9 / 17


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