Article
Physics, Particles & Fields
Daniel Elander, Michele Frigerio, Marc Knecht, Jean-Loic Kneur
Summary: This study focuses on strongly-coupled gauge theories with mass gap in the infrared and considers a large number of fermion flavours for ultraviolet completion in composite Higgs scenario. By using holographic approach, new models are introduced to incorporate the backreaction of flavour on geometry. The mass spectrum of composite bosonic states is computed and its dependence on symmetry-breaking operators and number of flavours is analyzed, with a critical survey on regions with light dilaton. Validity of holographic approach is carefully assessed and compared with lattice simulations and Nambu-Jona-Lasinio model.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jia Tian, Xiaoge Xu
Summary: In this work, the calculation of Renyi entropy in AdS(3)/(B)CFT2 is revisited. It is found that gravity solutions with brane intersection will result in negative Renyi entropy.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Shovon Biswas, Jani Kastikainen, Sanjit Shashi, James Sully
Summary: We use holography to study the spectra of boundary conformal field theories. By considering the interactions between two circular boundaries, we obtain information about the operator content and energy spectrum of the dual BCFT. We first study the interaction between two highly separated boundaries mediated by a scalar field, which produces a light scalar primary and its descendants in the closed-string channel of the dual BCFT. We then consider a gravity model with point particles and find that non-smooth mergers of boundaries can describe boundary-condition-changing operators in the open-string spectrum of the BCFT. We also discover a new class of sub-threshold Euclidean bra-ket wormhole saddles with a factorization puzzle for closed-string amplitudes.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Daniel Elander, Maurizio Piai
Summary: Within the context of top-down holography, this study explores a one-parameter family of regular background solutions of maximal gauged supergravity in seven dimensions, which are obtained by dimensionally reducing on a 2-torus. The corresponding dual field theory exhibits a global symmetry breaking pattern and includes particles with exotic quantum numbers. The interplay between explicit and spontaneous symmetry breaking is discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Yolanda Lozano, Nicolo Petri, Cristian Risco
Summary: We construct a new family of AdS(2) x S-2 x S-2 solutions by applying non-Abelian T-duality on a recent class of solutions. A particular solution in this class is connected to an AdS5 Gaiotto-Maldacena geometry and has a line defect interpretation in the dual 4d N = 2 SCFT, which is studied in detail. This construction provides an example of the successful applications of non-Abelian T-duality to holography.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Daniel Elander, Michele Frigerio, Marc Knecht, Jean-Loic Kneur
Summary: This article continues the study of strongly-coupled, approximately scale-invariant gauge theories with a large number of flavours, focusing on their application in the composite-Higgs scenario. By extending the holographic models, the authors compute the spectrum of composite fermionic states and observe the presence of light fermionic bound states in certain regions of parameter space. Additionally, a dense spectrum of states is observed in the presence of multi-scale dynamics induced by a large backreaction of bulk scalars on the geometry. The linear coupling between composite and elementary fermions is also studied, revealing that it can be dangerously irrelevant in certain circumstances. Finally, the partially composite spectrum is computed and its potential phenomenological implications, such as for top-quark partners, are assessed.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Adrita Chakraborty, Nibedita Padhi, Priyadarshini Pandit, Kamal L. Panigrahi
Summary: In this study, we examine the behavior of rigidly rotating and pulsating strings in the background of a 1+1 dimensional intersection of two orthogonal stacks of fivebranes in type IIB string theory using the Neumann-Rosochatius (NR) model. By employing a generalized ansatz, we reduce the system to the one dimensional NR model in the presence of flux. The integrable construction of the model allows us to analyze the rotating and oscillating string solutions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
M. Beccaria, A. Cabo-Bizet
Summary: This paper studies the Schur index of N = 4 U(N) SYM theory in 4d and its holographic giant graviton-type expansion at finite N. The world-volume brane superconformal index is computed using a recently proposed definition of the gauge holonomy integral as a multivariate residue. The brane expansion and its relation to previous giant graviton-type representations of the Schur index are clarified.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Guglielmo Grimaldi, Juan Hernandez, Robert C. Myers
Summary: The study focuses on two-dimensional eternal black holes with non-zero mass, interacting with a CFT on a circle. By computing the Page curve, it is found that the entropy rises linearly at early times and remains constant at late times, depending on the size of the thermal baths. The critical size and Page time are proportional to the ratio of the central charges of the conformal defect and the bath CFT.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Warren Carlson, Robert de Mello Koch, Minkyoo Kim
Summary: This paper constructs generating functions for operators dual to systems of giant gravitons with open strings attached. These operators have a bare dimension of order N, which makes the usual methods used to solve the planar limit not applicable. The generating functions are given as integrals over auxiliary variables, which symmetrize and antisymmetrize the indices of the fields. Our generating functions provide a simple construction of the Gauss graph operators previously obtained using a Fourier transform on a double coset, and they also offer a starting point for a systematic (1)(N) expansion and the action of the dilatation operator on these operators through a saddle point evaluation of the integral representation.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Juan Hernandez, Robert C. Myers, Shan-Ming Ruan
Summary: In this study, holographic complexity in the doubly holographic model was examined to focus on the holographic complexity=volume (CV) proposal for boundary subregions in the island phase. By deriving the leading contributions to the complexity and interpreting them in terms of the generalized volume of the island, a generalization of the CV proposal for higher curvature theories of gravity was proposed. Consistency checks were provided by investigating Gauss-Bonnet gravity and f(Script capital R) gravity in the bulk.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Mike Blake, Hong Liu
Summary: This paper presents evidence for the hydrodynamic origin of chaos in maximally chaotic systems and discusses the hallmarks of such systems, including the suppression of exponential growth in commutator squares of generic few-body operators. The study suggests that the nature of operator scrambling in maximally chaotic systems is fundamentally different from non-maximally chaotic systems. Additionally, the paper explores a scenario for the existence of a maximally chaotic regime in non-maximally chaotic systems at sufficiently large distances.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Zhi Wang, Zekun Xu, Shuyan Zhou, Yang Zhou
Summary: This study investigates the AdS region using the partial reduction method, exploring the relationship between defect extremal surfaces and entropy in boundary CFT. It also demonstrates the existence of a 4-dimensional massless graviton on an AdS(4) brane under partial reduction.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Nuclear
Hong-Zhe Zhang, Wan-Zhe Feng, Jun-Bao Wu
Summary: In this study, the correlation functions of Wilson (-'t Hooft) loops with chiral primary operators in the N = 4 supersymmetric Yang-Mills theory with S O(N) gauge symmetry were computed. The holographic dual description of this theory is the Type IIB superstring theory on the AdS(5) x RP5 background. The coefficients of the chiral primary operators in the operator product expansion of Wilson loops in different representations were computed and compared with those of the N = 4 SU(N) super Yang-Mills theory.
Article
Astronomy & Astrophysics
Elena Caceres, Arnab Kundu, Ayan K. Patra, Sanjit Shashi
Summary: This research focuses on the analytic continuations of holographic renormalization group (RG) flows beyond their infrared (IR) fixed points, which provide a natural framework for describing physics inside black holes. The study constructs a monotonic holographic a-function for counting degrees of freedom along a trans-IR flow. It is argued that the degrees of freedom become sparse and vanish when reaching a trans-IR endpoint represented by a Kasner singularity. Furthermore, the research demonstrates that entanglement and complexity from volume are generally insufficient in probing the trans-IR flows, while 2-point correlations and complexity from action are complementary and more effective in this regard.
Article
Physics, Particles & Fields
Raimond Abt, Johanna Erdmenger, Nick Evans, Konstantinos S. Rigatos
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
J. M. Drummond, D. Nandan, H. Paul, K. S. S. Rigatos
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Theodoros Nakas, Konstantinos S. Rigatos
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
Johanna Erdmenger, Nick Evans, Werner Porod, Konstantinos S. Rigatos
Summary: This study provides gauge/gravity dual descriptions of the strong coupling sector of composite Higgs models using insights from nonconformal examples of the AdS/CFT correspondence. The calculation of particle masses and pion decay constants for Sp(4) and SU(4) gauge theories shows results comparable to lattice studies, demonstrating the greater flexibility in choosing the fermion content leads to significant changes in bound state masses. The inclusion of suitable higher dimension operators can ensure a top mass consistent with the standard model.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
Konstantinos S. Rigatos
Summary: This study investigates the classical integrability of certain supergravity vacua containing an AdS(3) factor, using an established method for analyzing non-integrability. The results show that, except in specific limits, all supergravity solutions are non-integrable. This is in contrast to the known integrable solutions AdS(3) x S-3 x S3 x S-1 and AdS(3) x S-3 x T-4.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Konstantinos C. Rigatos, Xinan Zhou
Summary: In this paper, an infinite class of Witten diagrams invariant under a Yangian symmetry is explored, showing that the Yangian invariance is equivalent to the consistency of the recursion relations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Niko Jokela, Jose Manuel Penin, Konstantinos Christos S. Rigatos
Summary: This paper constructs gravity duals to supersymmetric gauge theories in the presence of unquenched flavor hypermultiplets. By considering the intersection of two sets of D3-branes in (1+1)-dimensional defect, the closed set of equations describing the dual geometry for a large number of colors and flavors in the Veneziano limit is derived. The solutions for massless flavors and the small flavor limit of massive hypermultiplets are briefly discussed. It is found that the 1/16-BPS supergravity solutions are generally asymptotically anti de-Sitter and the dilaton does not vary with the holographic radial coordinate, indicating the reliability of the classical Type IIB supergravity solutions for the gauge theories from the deep IR to the far UV.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Konstantinos C. Rigatos
Summary: We study spin-2 fluctuations in the type IIB theory on an infinite family of warped backgrounds AdS(2) x S-2 x T-4 x S-1 x I-rho with N = 4 supersymmetry. We find a special set of solutions, the minimal universal class, which is independent of the background data. These solutions correspond to operators with scaling dimension Delta = l + 1, where l is the quantum number of angular momentum on S-2. By computing the mode solutions, we determine the central charge of the dual field theories. We also discuss the relation between our results and the seed AdS(3) x S-2 x T-4 x I-rho backgrounds.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Nick Evans, Konstantinos S. Rigatos
Summary: Chiral symmetry breaking is related to the dimension of the quark bilinear condensate passing through one, and is supported by gap equations and holographic models. Confinement may be a separate property of pure Yang-Mills theory, occurring below the scale of dynamically generated quark mass.
Article
Astronomy & Astrophysics
Konstantinos S. Rigatos