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
Elena Caceres, Rodrigo Castillo Vasquez, Alejandro Vilar Lopez
Summary: The study derives the holographic entanglement entropy functional for a gravitational theory up to cubic order in the Riemann tensor, showcasing the differences between minimal and non-minimal splittings. The results are applied to specific examples and show that causal wedge inclusion is respected for a wide range of values of the cubic coupling.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Venkatesa Chandrasekaran, Netta Engelhardt, Sebastian Fischetti, Sergio Hernandez-Cuenca
Summary: We have discovered a new on-shell replica wormhole and shown that it has lower action than the disconnected one. The stability of this replica wormhole depends on the signature of allowed perturbations. We have also introduced a new method for computing the on-shell action of replicated manifolds and found evidence that quantum corrections can sometimes stabilize this new saddle.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Andrea Legramandi, Carlos Nunez
Summary: We present three infinite families of supersymmetric Type IIB backgrounds with AdS(4), AdS(3) and AdS(2) factors, which are dual to SCFTs in 3, 2 and 1 space-time dimensions respectively. These backgrounds emerge at low energies through a twisted compactification of five-dimensional N = 1 SCFTs on hyperbolic spaces. The holographic flows across dimensions are explicitly computed. We also discuss a family of SUSY breaking backgrounds corresponding to a QCD-like quiver with massive (bi)fundamental matter, and compute some field theoretical observables for these theories at the fixed points and along the flow.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Robert de Mello Koch, Garreth Kemp
Summary: The principle of the holography of information states that a copy of all the information available on a Cauchy slice is also available near the boundary. This redundancy in the theory is already present at low energy.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Salomeh Khoeini-Moghaddam, Farzad Omidi, Chandrima Paul
Summary: The study explores aspects of Hyperscaling Violating geometries at finite cutoff and zero temperature, focusing on holographic entanglement entropy, mutual information, and entanglement wedge cross section for strip-shaped entangling regions. Results show interesting features of HMI and EWCS compared to very small cutoff case, with HMI being a decreasing function and EWCS showing concavity changes. The location of phase transition and finite values are found to depend on the cutoff in this scenario.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Eyoab Bahiru
Summary: This article discusses the algebra of operators in the AdS-Rindler wedge, particularly in AdS(5)/CFT4. The algebra at the N = ∞ limit is explicitly constructed and its Type III1 nature is examined. The theory's 1/N corrections are considered, and a novel method of renormalizing the Ryu-Takayanagi surface area is utilized to renormalize several divergences, resulting in the algebra becoming Type II∞. This allows for the association of a density matrix with any state in the Hilbert space, leading to a von Neumann entropy.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
M. Ali-Akbari, M. Asadi, B. Amrahi
Summary: We evaluate the holographic entanglement entropy, HEE, holographic mutual information, HMI, and holographic entanglement of purification, EoP, in a non-conformal model at zero and finite temperature. We find that the non-conformal effects decrease the redefined HEE and increase the redefined HMI and EoP in the all studied regimes. The temperature effects increase (decrease) the redefined HEE (HMI) in the all studied regimes while it has no definite effect on the redefined EoP. From the information point of view, we find that in the vicinity of the phase transition the zero temperature state is more favorable than the finite temperature one.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Roberto Auzzi, Stefano Baiguera, Sara Bonansea, Giuseppe Nardelli
Summary: Research has found that the holographic complexity of formation for the AdS(3) 2-sided Randall-Sundrum model and the AdS(3)/BCFT2 models is logarithmically divergent according to the volume conjecture, while it is finite using the action proposal. One might be tempted to conclude that the UV divergences of the volume and action conjectures are always different for defects and boundaries in two-dimensional conformal field theories. However, in Janus AdS(3), it is found that both volume and action proposals provide the same kind of logarithmic divergences.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Stefano Antonini, Petar Simidzija, Brian Swingle, Mark Van Raamsdonk
Summary: This paper explores the effects of wormholes in flat big bang-big crunch cosmologies on the state of the coupled pair of 3D theories, and provides methods to reconstruct the wormhole geometry from certain physical quantities.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Arnab Kundu, Vinay Malvimat, Ritam Sinha
Summary: By calculating the Krylov Complexity of primary operators in a 2d CFT, we observe different behaviors based on whether the scaling dimension of the operators exceeds the critical dimension, suggesting a close relationship between operator growth, K-complexity, and the underlying entanglement structure.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Yi-Yu Lin, Jia-Rui Sun, Yuan Sun, Jie-Chen Jin
Summary: This study provides a bit thread description of the AdS/BCFT setup, characterizing the specific entanglement details between different parts of the system with an entanglement island. The research also distinguishes between the fine-grained PEE and the semi-classical PEE in the context of an island.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Shi-Fa Guo, Hai-Shan Liu, H. Lue, Yi Pang
Summary: By constructing a class of charged AdS boson star solutions, we found that the leading coefficient c(3/2)(k) exhibits a monotonic increasing behavior with respect to k, showing linear growth when k is small and approaching maximal value with a decreasing rate as k tends to infinity. A closed form expression fitting the numerical data within 10(-4) accuracy for the entire range of k was also obtained.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Eyoab Bahiru, Niloofar Vardian
Summary: We investigate entanglement wedge reconstruction in AdS/CFT using the Petz recovery channel. For a spherical region on the boundary, we demonstrate that the Petz map can reproduce the AdS-Rindler HKLL reconstruction. Additionally, for a generic subregion of the boundary, we are able to obtain the same boundary representation of a local bulk field lying in the entanglement wedge as the one proposed earlier in [1, 2] using the properties of the modular flow.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Bowen Chen, Bartlomiej Czech, Jan de Boer, Lampros Lamprou, Zi-zhi Wang
Summary: We construct operators in holographic two-dimensional conformal field theory that locally act as arbitrary bulk spacelike vector fields in the code subspace. The key aspect of this construction is the interplay between parallel transport in the bulk spacetime and in kinematic space. We outline the challenges faced when extending this construction to timelike vector fields and also provide several applications, such as boundary formulations of the bulk Riemann tensor, dreibein, spin connection, and holographic complexity.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
G. A. Matzeu, M. Lieu, M. T. Costa, J. N. Reeves, V Braito, M. Dadina, E. Nardini, P. G. Boorman, M. L. Parker, S. A. Sim, D. Barret, E. Kammoun, R. Middei, M. Giustini, M. Brusa, J. Perez Cabrera, S. Marchesi
Summary: This study presents a new X-ray Accretion Disc-wind Emulator (xrade) that utilizes a Monte Carlo radiative transfer code and supervised machine learning. The trained emulator can quickly generate synthetic spectra and does not suffer from interpolation issues.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jiachen Jiang, Douglas J. K. Buisson, Thomas Dauser, Andrew C. Fabian, Felix Furst, Luigi C. Gallo, Fiona A. Harrison, Michael L. Parker, James F. Steiner, John A. Tomsick, Santiago Ubach, Dominic J. Walton
Summary: In this study, the NuSTAR and Swift spectra of the black hole candidate MAXI J1813-095 in a failed-transition outburst in 2018 were analyzed. The analysis revealed evidence of reflected emission from the inner region of the accretion disc and provided insights into the inner radius of the disc. The spectral variability of MAXI J1813-095 was found to be dominated by the variable photon index of the Comptonization emission.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Riley M. T. Connors, Javier A. Garcia, John Tomsick, Guglielmo Mastroserio, Victoria Grinberg, James F. Steiner, Jiachen Jiang, Andrew C. Fabian, Michael L. Parker, Fiona Harrison, Jeremy Hare, Labani Mallick, Hadar Lazar
Summary: The degree to which the thin accretion disks of black hole X-ray binaries are truncated during hard spectral states remains a contentious open question in black hole astrophysics. We reexamine the observed black hole X-ray binary XTE J1752-223 and show that reflection modeling requires that the disk be within about 5 R (ISCO) during the hard spectral state.
ASTROPHYSICAL JOURNAL
(2022)
Article
Engineering, Chemical
Oluwaseyi Ogunsola, Jazil Bin Shahid, Paul Michael
Summary: The effect of fluid properties on hydraulic cylinder rod seal stick-slip friction was investigated. The study findings provide a foundation for the development of fluids that can enhance the control and safety of hydraulic equipment.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Astronomy & Astrophysics
Jiachen Jiang, Luigi C. Gallo, Dirk Grupe, Michael L. Parker
Summary: The study presents a spectral analysis of XMM-Newton observations of UGC 11763, indicating three spectral models that can explain the X-ray variability of the galaxy. Future high-resolution X-ray missions will help to further test these models on UGC 11763.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Komossa, A. Kraus, D. Grupe, M. L. Parker, A. Gonzalez, L. C. Gallo, M. A. Gurwell, S. Laine, S. Yao, S. Chandra, L. Dey, J. L. Gomez, K. Hada, D. Haggard, A. R. Hollett, H. Jermak, S. Jorstad, T. P. Krichbaum, S. Markoff, C. McCall, J. Neilsen, M. Nowak
Summary: We are conducting the most extensive and longest multiyear, multiwavelength monitoring project on OJ 287. The MOMO project covers a wide range of wavelengths and aims to understand disk-jet physics and test the binary black hole scenario of OJ 287.
ASTRONOMISCHE NACHRICHTEN
(2023)
Article
Astronomy & Astrophysics
W. Kollatschny, D. Grupe, M. L. Parker, M. W. Ochmann, N. Schartel, E. Romero-Colmenero, H. Winkler, S. Komossa, P. Famula, M. A. Probst, M. Santos-Lleo
Summary: IRAS 23226-3843, a changing-look AGN, experienced a strong X-ray and UV flux outburst in 2019. During the outburst, it showed significant variations in the X-ray and optical continuum, as well as changes in the H α emission-line profiles. One year later, its optical spectral type changed to become a Seyfert type 2 object.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
S. Komossa, A. Kraus, D. Grupe, A. G. Gonzalez, M. A. Gurwell, L. C. Gallo, F. K. Liu, I. Myserlis, T. P. Krichbaum, S. Laine, U. Bach, J. L. Gomez, M. L. Parker, S. Yao, M. Berton
Summary: Based on our Swift monitoring program, OJ 287 is well-monitored in the X-ray-UV-optical regime. We report the results of our radio monitoring of OJ 287 between 2015 and 2022, including Fermi gamma-ray observations. We analyze the radio flux and spectral variability, discuss its connection with multiwavelength emission, and study the extraordinary 2016/2017 outburst.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Erin Kara, Aaron J. Barth, Edward M. Cackett, Jonathan Gelbord, John Montano, Yan-Rong Li, Lisabeth Santana, Keith Horne, William N. Alston, Douglas Buisson, Doron Chelouche, Pu Du, Andrew C. Fabian, Carina Fian, Luigi Gallo, Michael R. Goad, Dirk Grupe, Diego H. Gonzalez Buitrago, Juan V. Hernandez Santisteban, Shai Kaspi, Chen Hu, S. Komossa, Gerard A. Kriss, Collin Lewin, Tiffany Lewis, Michael Loewenstein, Anne Lohfink, Megan Masterson, Ian M. McHardy, Missagh Mehdipour, Jake Miller, Christos Panagiotou, Michael L. Parker, Ciro Pinto, Ron Remillard, Christopher Reynolds, Daniele Rogantini, Jian-Min Wang, Jingyi Wang, Dan Wilkins
Summary: We present the first results from a 100-day observing campaign of the Seyfert 1 galaxy Mrk 335 using three instruments. Despite a low X-ray flux state, we observed UV-optical lags as expected. Interestingly, both low- and high-flux states revealed longer UV-optical lags than expected. The optical rise preceded a sharp rise in X-rays, suggesting a departure from previous reprocessing models.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Marina Orio, Keith Gendreau, Morgan Giese, Gerardo Juan M. Luna, Jozef Magdolen, Tod E. Strohmayer, Andy E. Zhang, Diego Altamirano, Andrej Dobrotka, Teruaki Enoto, Elizabeth C. Ferrara, Richard Ignace, Sebastian Heinz, Craig Markwardt, Joy S. Nichols, Michael L. Parker, Dheeraj R. Pasham, Songpeng Pei, Pragati Pradhan, Ron Remillard, James F. Steiner, Francesco Tombesi
Summary: The 2021 outburst of the symbiotic recurrent nova RS Oph was monitored using the Neutron Star Interior Composition Explorer Mission (NICER). The study provides a detailed view of the outburst development, revealing that the X-ray flux preceding the supersoft X-ray phase peaked almost 5 days after the optical maximum and originated from shocked ejecta. The study also finds that a quasi-periodic oscillation with varying amplitudes was consistently observed during the supersoft X-ray source (SSS) phase.
ASTROPHYSICAL JOURNAL
(2023)
Article
Multidisciplinary Sciences
Aviram Uri, Sergio C. de la Barrera, Mallika T. Randeria, Daniel Rodan-Legrain, Trithep Devakul, Philip J. D. Crowley, Nisarga Paul, Kenji Watanabe, Takashi Taniguchi, Ron Lifshitz, Liang Fu, Raymond C. Ashoori, Pablo Jarillo-Herrero
Summary: Researchers have created a highly tunable quasicrystal structure by twisting three layers of graphene and forming two mutually incommensurate moire patterns. This 'moire quasicrystal' allows for control over the electronic system between periodic and quasiperiodic regimes, and exhibits superconductivity and flavour-symmetry-breaking phase transitions.
Article
Multidisciplinary Sciences
Trithep Devakul, Patrick J. Ledwith, Li-Qiao Xia, Aviram Uri, Sergio C. de la Barrera, Pablo Jarillo-Herrero, Liang Fu
Summary: We propose magic-angle helical trilayer graphene (HTG) as a platform for realizing exotic correlated topological states of matter, and provide experimental evidence and theoretical explanations.
Article
Astronomy & Astrophysics
Francesco Knechtli, Tomasz Korzec, Michael Peardon, Juan Andres Urrea-Nino
Summary: This paper introduces and optimizes more general operators in the space of smooth fields, enhancing the performance of the method when tested on systems of heavy quark-antiquark pairs.
Article
Engineering, Mechanical
Jill Bramer, Eric Sattler, Paul Michael
Summary: The US Army uses MIL-PRF-2104 SAE 10 hydraulic fluid in its construction and material handling equipment, but it has not been optimized for hydraulic system efficiency. Two energy efficient hydraulic fluids were compared to MIL-PRF-2104 SAE 10, and the study concluded that using higher efficiency fluids can reduce fuel consumption and save costs.
Meeting Abstract
Psychology, Clinical
Cassandra Smith, Michael Daniel, Paul Michael
ARCHIVES OF CLINICAL NEUROPSYCHOLOGY
(2022)