All Outputs (19)

Emergent gravity from hidden sectors and TT deformations (2021)
Journal Article
Betzios, P., Kiritsis, E., & Niarchos, V. (2021). Emergent gravity from hidden sectors and TT deformations. Journal of High Energy Physics, 2021(1), Article 202. https://doi.org/10.1007/jhep02%282021%29202

We investigate emergent gravity extending the paradigm of the AdS/CFT correspondence. The emergent graviton is associated to the (dynamical) expectation value of the energy-momentum tensor. We derive the general effective description of such dynamics... Read More about Emergent gravity from hidden sectors and TT deformations.

(Mis-)matching type-B anomalies on the Higgs branch (2021)
Journal Article
Niarchos, V., Papageorgakis, C., Pini, A., & Pomoni, E. (2021). (Mis-)matching type-B anomalies on the Higgs branch. Journal of High Energy Physics, 2021, Article 106. https://doi.org/10.1007/jhep01%282021%29106

Building on [1], we uncover new properties of type-B conformal anomalies for Coulomb-branch operators in continuous families of 4D N = 2 SCFTs. We study a large class of such anomalies on the Higgs branch, where conformal symmetry is spontaneously br... Read More about (Mis-)matching type-B anomalies on the Higgs branch.

Type-B anomaly matching and the 6D (2,0) theory (2020)
Journal Article
Niarchos, V., Papageorgakis, C., & Pomoni, E. (2020). Type-B anomaly matching and the 6D (2,0) theory. Journal of High Energy Physics, 2020(4), Article 48. https://doi.org/10.1007/jhep04%282020%29048

We study type-B conformal anomalies associated with 12 -BPS Coulomb-branch operators in 4D N = 2 superconformal field theories. When the vacuum preserves the conformal symmetry these anomalies coincide with the two-point function coefficients in the... Read More about Type-B anomaly matching and the 6D (2,0) theory.

Thermal transitions of metastable M-branes (2019)
Journal Article
Armas, J., Nguyen, N., Niarchos, V., & Obers, N. A. (2019). Thermal transitions of metastable M-branes. Journal of High Energy Physics, 2019(8), Article 128. https://doi.org/10.1007/jhep08%282019%29128

We use blackfold methods to analyse the properties of putative supergravity solutions in M-theory that describe the backreaction of polarised anti-M2 branes (namely, M5 branes wrapping three-cycles with negative M2-brane charge) in the Cvetic-Gibbons... Read More about Thermal transitions of metastable M-branes.

Metastable Nonextremal Antibranes (2019)
Journal Article
Armas, J., Nguyen, N., Niarchos, V., Obers, N., & Van Riet, T. (2019). Metastable Nonextremal Antibranes. Physical Review Letters, 122(18), Article 181601. https://doi.org/10.1103/physrevlett.122.181601

We find new and compelling evidence for the metastability of supersymmetry-breaking states in holographic backgrounds whose consistency has been the source of ongoing disagreements in the literature. As a concrete example, we analyze anti-D3 branes a... Read More about Metastable Nonextremal Antibranes.

Deconstructing defects (2019)
Journal Article
Hayling, J., Niarchos, V., & Papageorgakis, C. (2019). Deconstructing defects. Journal of High Energy Physics, 2019(2), Article 67. https://doi.org/10.1007/jhep02%282019%29067

We use the exact-deconstruction prescription to lift various squashed-S3 partition functions with supersymmetric-defect insertions to four-dimensional superconformal indices. Starting from three-dimensional circular-quiver theories with vortex-loop-o... Read More about Deconstructing defects.

QCD3 with two-index quarks, mirror symmetry, and fivebrane anti-BIons near orientifolds (2018)
Journal Article
Armoni, A., & Niarchos, V. (2018). QCD3 with two-index quarks, mirror symmetry, and fivebrane anti-BIons near orientifolds. Physical Review D, 98(11), Article 114009. https://doi.org/10.1103/physrevd.98.114009

We consider a nonsupersymmetric Hanany-Witten type IIB brane configuration that realizes a threedimensional USpð2NÞ gauge theory with quarks in the two-index antisymmetric representation and SOð4Þ flavor symmetry. Using type IIB S-duality we find the... Read More about QCD3 with two-index quarks, mirror symmetry, and fivebrane anti-BIons near orientifolds.

Geometry of Higgs-branch superconformal primary bundles (2018)
Journal Article
Niarchos, V. (2018). Geometry of Higgs-branch superconformal primary bundles. Physical Review D, 98(6), Article 065012. https://doi.org/10.1103/physrevd.98.065012

It is known that the two- and three-point functions of Higgs-branch superconformal primaries in 4d N = 2 superconformal field theories obey nonrenormalization theorems on N = 2 superconformal manifolds. In this paper, we prove a stronger statement—th... Read More about Geometry of Higgs-branch superconformal primary bundles.

Phases of QCD_3 from non-SUSY Seiberg duality and brane dynamics (2018)
Journal Article
Armoni, A., & Niarchos, V. (2018). Phases of QCD_3 from non-SUSY Seiberg duality and brane dynamics. Physical Review D, 97(10), Article 106001. https://doi.org/10.1103/physrevd.97.106001

We consider a nonsupersymmetric USp Yang-Mills Chern-Simons gauge theory coupled to fundamental flavors. The theory is realised in type-IIB string theory via an embedding in a Hanany-Witten brane configuration which includes an orientifold and antibr... Read More about Phases of QCD_3 from non-SUSY Seiberg duality and brane dynamics.

Aspects of Berry phase in QFT (2017)
Journal Article
Baggio, M., Niarchos, V., & Papadodimas, K. (2017). Aspects of Berry phase in QFT. Journal of High Energy Physics, 2017(04), Article 062. https://doi.org/10.1007/jhep04%282017%29062

When continuous parameters in a QFT are varied adiabatically, quantum states typically undergo mixing — a phenomenon characterized by the Berry phase. We initiate a systematic analysis of the Berry phase in QFT using standard quantum mechanics method... Read More about Aspects of Berry phase in QFT.

Large-N correlation functions in N = 2 superconformal QCD (2017)
Journal Article
Baggio, M., Niarchos, V., Papadodimas, K., & Vos, G. (2017). Large-N correlation functions in N = 2 superconformal QCD. Journal of High Energy Physics, 2017(01), Article 101. https://doi.org/10.1007/jhep01%282017%29101

We study extremal correlation functions of chiral primary operators in the large-N SU(N ) NN = 2 superconformal QCD theory and present new results based on supersymmetric localization. We discuss extensively the basis-independent data that can be ext... Read More about Large-N correlation functions in N = 2 superconformal QCD.

Forced Fluid Dynamics from Blackfolds in General Supergravity Backgrounds (2016)
Journal Article
Armas, J., Gath, J., Niarchos, V., Obers, N. A., & Pedersen, A. V. (2016). Forced Fluid Dynamics from Blackfolds in General Supergravity Backgrounds. Journal of High Energy Physics, 2016(10), Article 154. https://doi.org/10.1007/jhep10%282016%29154

We present a general treatment of the leading order dynamics of the collective modes of charged dilatonic p-brane solutions of (super) gravity theories in arbitrary backgrounds. To this end we employ the general strategy of the blackfold approach whi... Read More about Forced Fluid Dynamics from Blackfolds in General Supergravity Backgrounds.

N =2 supersymmetric field theories on 3-manifolds with A-type boundaries (2016)
Journal Article
Aprile, F., & Niarchos, V. (2016). N =2 supersymmetric field theories on 3-manifolds with A-type boundaries. Journal of High Energy Physics, 2016(7), Article 126. https://doi.org/10.1007/jhep07%282016%29126

General half-BPS A-type boundary conditions are formulated for NN = 2 supersymmetric field theories on compact 3-manifolds with boundary. We observe that under suitable conditions manifolds of the real A-type admitting two complex supersymmetries (re... Read More about N =2 supersymmetric field theories on 3-manifolds with A-type boundaries.

A Lagrangian for self-dual strings (2015)
Journal Article
Niarchos, V. (2015). A Lagrangian for self-dual strings. Journal of High Energy Physics, 2015(12), Article 060. https://doi.org/10.1007/jhep12%282015%29060

We propose a Lagrangian for the low-energy theory that resides at the (1 + 1)-dimensional intersection of N semi-infinite M2-branes ending orthogonally on M M5-branes in R1,2×C4/ZkR1,2×C4/Zk (for arbitrary positive integers N, M, k). We formulate thi... Read More about A Lagrangian for self-dual strings.

On exact correlation functions in SU(N) N=2 superconformal QCD (2015)
Journal Article
Baggio, M., Niarchos, V., & Papadodimas, K. (2015). On exact correlation functions in SU(N) N=2 superconformal QCD. Journal of High Energy Physics, 2015(11), Article 198. https://doi.org/10.1007/jhep11%282015%29198

We consider the exact coupling constant dependence of extremal correlation functions of N=2N=2 chiral primary operators in 4d N=2N=2 superconformal gauge theories with gauge group SU(N) and Nf = 2N massless fundamental hypermultiplets. The 2- and 3-p... Read More about On exact correlation functions in SU(N) N=2 superconformal QCD.

Defects in Chern-Simons theory, gauged WZW models on the brane, and level-rank duality (2015)
Journal Article
Armoni, A., & Niarchos, V. (2015). Defects in Chern-Simons theory, gauged WZW models on the brane, and level-rank duality. Journal of High Energy Physics, 2015(7), Article 062. https://doi.org/10.1007/jhep07%282015%29062

We consider Hanany-Witten setups of 3- and 5-branes in type IIB string theory that realize N=(1,0)N=(1,0) , (2, 0) and (1, 1) gauged WZW models in 1 + 1 dimensions. The gauged WZW models arise as theories residing on the boundary of D3 branes ending... Read More about Defects in Chern-Simons theory, gauged WZW models on the brane, and level-rank duality.

tt∗ equations, localization and exact chiral rings in 4d N = 2 SCFTs (2015)
Journal Article
Baggio, M., Niarchos, V., & Papadodimas, K. (2015). tt∗ equations, localization and exact chiral rings in 4d N = 2 SCFTs. Journal of High Energy Physics, 2015(2), Article 122. https://doi.org/10.1007/jhep02%282015%29122

We compute exact 2- and 3-point functions of chiral primaries in four-dimensional NN = 2 superconformal field theories, including all perturbative and instanton contributions. We demonstrate that these correlation functions are nontrivial and satisfy... Read More about tt∗ equations, localization and exact chiral rings in 4d N = 2 SCFTs.

Large-N transitions of the connectivity index (2015)
Journal Article
Aprile, F., & Niarchos, V. (2015). Large-N transitions of the connectivity index. Journal of High Energy Physics, 2015(2), Article 083. https://doi.org/10.1007/jhep02%282015%29083

The connectivity index, defined as the number of decoupled components of a separable quantum system, can change under deformations of the Hamiltonian or during the dynamical change of the system under renormalization group flow. Such changes signal a... Read More about Large-N transitions of the connectivity index.

Supersymmetric Perturbations of the M5 brane (2014)
Journal Article
Niarchos, V. (2014). Supersymmetric Perturbations of the M5 brane. Journal of High Energy Physics, 2014(5), Article 023. https://doi.org/10.1007/jhep05%282014%29023

We study long-wavelength supersymmetric deformations of brane solutions in supergravity using an extension of previous ideas within the general scheme of the blackfold approach. As a concrete example, we consider long-wavelength perturbations of the... Read More about Supersymmetric Perturbations of the M5 brane.