Quantum phase transition in supersymmetric QED 3
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1 Quantum phase transition in supersymmetric QED 3 Miguel Tierz Departamento de Matemática Faculdade de Ciências, Universidade de Lisboa tierz@fc.ul.pt Iberian Strings 2017 at Instituto Superior Técnico. 16/01/2017. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at1 Instituto / 15
2 Outline Quick introduction Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa Strings 2017 at2 Instituto / 15
3 Outline Quick introduction Localization and conical function Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa Strings 2017 at2 Instituto / 15
4 Outline Quick introduction Localization and conical function N = 4 supersymmetric QED in three dimensions iguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at2 Instituto / 15
5 Outline Quick introduction Localization and conical function N = 4 supersymmetric QED in three dimensions Integral representation of Z N iguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at2 Instituto / 15
6 Outline Quick introduction Localization and conical function N = 4 supersymmetric QED in three dimensions Integral representation of Z N Partition function, exact formulas iguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at2 Instituto / 15
7 Outline Quick introduction Localization and conical function N = 4 supersymmetric QED in three dimensions Integral representation of Z N Partition function, exact formulas Large N saddle-point analysis and phase transitions iguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at2 Instituto / 15
8 Outline Quick introduction Localization and conical function N = 4 supersymmetric QED in three dimensions Integral representation of Z N Partition function, exact formulas Large N saddle-point analysis and phase transitions Correlation functions of gauge invariant mass operator Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at2 Instituto / 15
9 Outline Quick introduction Localization and conical function N = 4 supersymmetric QED in three dimensions Integral representation of Z N Partition function, exact formulas Large N saddle-point analysis and phase transitions Correlation functions of gauge invariant mass operator Outlook and open problems Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at2 Instituto / 15
10 Introduction Localization Progress on exact computations in supersymmetric quantum field theories. Localization: path integral finite dimensional integral. We study an Abelian theory, so our integral representation is one-dimensional (instead of matrix model). Localization rules in 3d: The coupling for the background vector multiplet responsible for FI terms contributes S classical = 2πiηTr (σ). For every N = 4 hypermultiplet (matter) there is a factor Z 1 loop = ρ 1 cosh (πρ (σ)) Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at3 Instituto / 15
11 Introduction Math The conical or Mehler functions are associated Legendre functions P µ ν (x) of complex index ν = iτ. P µ ν (x) = 1 Γ (1 µ) 1 + x 1 x µ 2 2F 1 ( ν, ν, 1 µ; 1 2 (1 x) ). They are the kernel of the Mehler Fock transform (relevant in hyperbolic geometry, disordered systems,...) but we will not use all these properties today. Instead, it admits a number of equivalent integral representations, and one of them can be identified with a localization result. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at4 Instituto / 15
12 Susy QED 3 Integral representation We focus on N = 4 SQED on S 3 with FI parameter. Thus, we consider an N = 4 U(1) theory consisting of 2N N = 4 massive (flavor) hypermultiplets (N of mass m and N of mass m), coupled to an N = 4 vector multiplet. Localization readily leads to: e Z QED3 = iηx dx [ 2 cosh( x+m x m 2 )2 cosh( 2 )] N = 2 N dxe iηx [cosh x + cosh m] N. This matter content but with a Chern-Simons term and in the U(N) case was considered in Barranco-Russo (arxiv: ); Russo-Silva-MT CMP, 338, 1411 (2015); G. Giasemidis-MT, JHEP 1601 (2016) 068; MT, JHEP 1604 (2016) 168 Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at5 Instituto / 15
13 Susy QED 3 Exact formulas for partition function We then find Z QED3 = 2π Γ (N + iη) Γ (N iη) Γ (N) (sinh(m)) N 1 2 P 1 2 N 1 2 +iη(cosh(m)). (1) Equivalently, in terms of an hypergeometric function (z cosh(m)) Z QED3 = 2π Γ (N + iη) Γ (N iη) Γ (N) Γ ( N + 1 2) (1 + z) N 1 2 (2) 2 F 1 ( 1 2 iη, iη, N ; 1 2 (1 z) ). Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at6 Instituto / 15
14 Susy QED 3 Exact formulas for partition function Particular cases, for two and four flavors: Z N=1 QED 3 = Z N=2 QED 3 = 2π sin (mη) sinh (m) sinh (πη), (3) 2π (cosh m sin (mη) η sinh m cos (mη)) sinh 3. (4) (m) sinh (πη) These can also be obtained from residue integration (S. Benvenuti and S. Pasquetti, JHEP 1205, 099 (2012)). Another offshots of the hyp. rep.: 1) a three-term recurrence relationship in N, used to generate explicit expressions. 2) A second-order differential equation (Schrodinger eq.). 3) A large m formula. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at7 Instituto / 15
15 Susy QED 3 Large N saddle-point analysis The integrand above can be written as e NS(λ) where the action S is S(λ, x, z) = iλx + log(cosh x + cosh m). The saddle-point equation is then (λ η/n) iλ + sinh x cosh x + cosh m = 0, which has as solutions, ( ) λ cosh m ± i x 1,2 = log + 2πin, (5) i + λ where n Z and 1 λ 2 sinh 2 m. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at8 Instituto / 15
16 Susy QED 3 Phase transition. Subcritical phase We show that the theory undergoes a large N phase transition at λ c 1/ sinh m, or, more generally, at the critical line λ sinh(m) = 1 in the (λ, m) space, where = 0. Subcritical phase (λ sinh(m) < 1). All saddle points lie on Im axis. The saddle point x 1 with n = 0 is the relevant one and, to leading order for large N, the Z becomes 2π Z QED3 NS (x 1 ) exp ( NS (x 1)). (6) where S (z, x) = (z cosh (x) + 1) / (cosh (x) + z) 2. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at9 Instituto / 15
17 Susy QED 3 Supercritical phase The two saddle points move to the complex plane, with x 2 = x 1. Action is complex, with Re (S (x 1 )) = Re (S (x 2 )), Im (S (x 1 )) = Im (S (x 2 )). Both saddle points contribute with equal weights and need to be taken into account. Then: ( ) 2π Z N e NRe(S(x 1)) e inim(s(x 1)) + c.c.. S (x 1 ) For N 1, this expression agrees with the exact analytic expression. For large m, it is also in precise agreement with a large mass formula in the paper, based on the hyp. representation. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 10 Instituto / 15
18 Susy QED 3 Second order phase transition df d 2 F dλ 2.5 dλ λ < λc λ > λc λ < λc λ λ > λc λ Figure: (a) Behavior of df /dλ. (b) Discontinuity of d 2 F /dλ 2 at the transition point (m = 1). Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 11 Instituto / 15
19 Susy QED3 Second order phase transition 1.4 Supercritical 1.2 Mass Subcritical λ Figure: Phase diagram. The critical line (dashed) λ sinh(m ) = 1 separates the two phases. The plot also shows the contour lines of d 2 F /d λ2 (increasing from dark to light). Miguel Tierz (Departamento de Matem atica Faculdade J. Russo de Ciˆ and encias, MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 12Instituto / 15
20 Correlation functions of gauge invariant mass operators See also Dedushenko, Pufu and Yacoby [arxiv: ] By diff. the F w.r.t. m, one generates correlators of the gauge invariant mass operator J 3 = 1 ( Q 1,i Q1 i Q 2,i Q i 2N 2), where Q 1 are the chiral multiplets of mass m and Q 2 the chiral multiplets of mass m. For example, for the simple N = 1 case, we have that J 3 df dm = η cot (mη) coth (m), J 3 J 3 J 3 J 3 d 2 F dm 2 = η 2 sin 2 (mη) + 1 sinh 2 (m). Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 13 Instituto / 15
21 Correlation functions of gauge invariant mass operators See also Dedushenko, Pufu and Yacoby [arxiv: ] Returning to the large N free energy, we find that J 3 is continuous, whereas ( d 2 ) ( ) F 1 cosh m dm 2 = λ<λ c N sinh 2 1 m 1 λ 2 sinh 2 m ( d 2 ) F 1 dm 2 N sinh 2 m. λ>λ c = Thus d 2 F /dm 2 is discontinuous, implying a discontinuity in the two-point function of operator J 3. The 2-point correlation function diverges as the critical line is approached from the subcritical phase. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 14 Instituto / 15
22 Summary and Outlook The saddle-point analysis suggests that the mechanism that triggers the phase transition is quite generic. Also, the non-abelian theory (N = 4 SYM theory) admits a determinantal representation whose elements are conical functions (in progress). Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 15 Instituto / 15
23 Summary and Outlook The saddle-point analysis suggests that the mechanism that triggers the phase transition is quite generic. Also, the non-abelian theory (N = 4 SYM theory) admits a determinantal representation whose elements are conical functions (in progress). The theory is dual to a A N 1 quiver gauge theory quiver gauge theory also has a novel type of phase transition in the limit when the number of quiver nodes goes to infinity. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 15 Instituto / 15
24 Summary and Outlook The saddle-point analysis suggests that the mechanism that triggers the phase transition is quite generic. Also, the non-abelian theory (N = 4 SYM theory) admits a determinantal representation whose elements are conical functions (in progress). The theory is dual to a A N 1 quiver gauge theory quiver gauge theory also has a novel type of phase transition in the limit when the number of quiver nodes goes to infinity. The Z QED3 with FI term is given in terms of the conical function. This simple formula encapsulates rich physical phenomena: large N phase transitions, asymptotic 1/N expansion, emergence of complex saddle points, non-perturbative effects and aspects of mirror symmetry. Miguel Tierz (Departamento de Matemática Faculdade J. Russo de Ciências, and MT arxiv: Universidade de Lisboa tierz@fc.ul.ptiberian Strings 2017 at 15 Instituto / 15
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