# SciPost News

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### Launch of SciPost Physics Core

##### 11 November 2019

Our brand new title in physics, SciPost Physics Core, has been officially launched today with its very first publication!

Part of our current expansion plans, this new journal offers the same Genuine Open Access features as our other titles. With its more community-based editorial process, it is the perfect companion to our physics flagship journal SciPost Physics.

Visit the SciPost Physics Core about page### C. Córdova et al. receive the Select label

##### 28 October 2019

"Exceptional Chern-Simons-Matter dualities" by Clay Cordova, Po-Shen Hsin, Kantaro Ohmori has received the Select label. Warm congratulations to the author!

This well-structured paper fills the gap in literature regarding how the exceptional groups fit into topological quantum field theories for classical Lie groups. The authors first give a concise, helpful presentation of some mathematically rigorous facts about topological quantum field theories with exceptional gauge groups. Then, they developed a set of new families of Chern-Simons theories. This is done exploiting the conformal embedding technique for the corresponding chiral algebras, as well as with the aid of some results concerning more formal aspects of Kac-Moody algebras. With the new dualities for topological Chern-Simons theories, the authors proceed to formulate an array of conjectures regarding the Chern-Simons-matter dualities with scalar matter. Finally, they use them to determine candidate phase diagrams of time-reversal invariant G2 gauge theory coupled to either an adjoint fermion, or two fundamental fermions.

### L. Balents receives the Select label

##### 10 October 2019

"General continuum model for twisted bilayer graphene and arbitrary smooth deformations" by Leon Balents has received the Select label. Warm congratulations to the author!

Moiré patterns can affect the low energy electronic structure in twisted bilayer graphene and provide an unprecedented platform for correlated electron physics. In this clear paper, the author uses a simple derivation of a continuum Hamiltonian to calculate the low energy electronic band structure. The original continuum model written in the momentum space is hard to use when lattice relaxation and strain effects come in. To solve this issue, the current paper derives the continuum model in real space, which can easily incorporate strain effects. With this new method, the author provides a unified method to study twisted graphene structures including all the important electronic structure physics. It may also be helpful for future studies of disorder effects in these systems.

### A. Morin-Duchesne and J. L. Jacobsen receive the Select label

##### 30 September 2019

"Logarithmic correlation functions for critical dense polymers on the cylinder" by Alexi Morin-Duchesne and Jesper Lykke Jacobsen has received the Select label. Warm congratulations to the authors!

In this paper, the authors have studied the complex issue of correlation functions in the dense polymer problem. Demonstrating formidable mathematical skills, they are able to express the results in terms of integral formulae and hypergeometric functions. These lattice results were then used to compute structure constants and ratios that appear in the operator product expansions of the boundary condition changing fields. The log-conformal field theories presented in this paper are of special interest in the field of condensed matter theory, as they represent the case where some of the fields are logarithmic instead of primary and thus do not undergo simple multiplicative scale changes under dilation. These results can lead to better understanding of many interesting models like the sandpile model, dense polymers, and critical percolation.

### P. Armagnat et al. receive the Select label

##### 11 September 2019

"The self-consistent quantum-electrostatic problem in strongly non-linear regime" by Pacome Armagnat, A. Lacerda-Santos, Benoit Rossignol, Christoph Groth and Xavier Waintal has received the Select label. Warm congratulations to the authors!

In this well written and detailed paper, the authors propose an effective method to solve "the self-consistent quantum-electrostatic problem" at zero temperature. Commonly, this problem has been avoided, but the authors of these paper present a stable algorithm that provides a solution to this problem with controlled accuracy. The main result of the manuscript is eliminating the convergence issues of the Schrodinger-Poisson problem and reducing the necessity to perform computationally intensive steps of quantum simulation to only a few iterations. Overall, this proposal can be very valuable to many researchers that have to address this problem in some form in their modelling of physical phenomena.

### P. Kubiczek et al. receive the Select label

##### 2 August 2019

"Exact real-time dynamics of single-impurity Anderson model from a single-spin hybridization-expansion" by P. Kubiczek, A. N. Rubtsov and A. I. Lichtenstein has received the Select label. Warm congratulations to the authors!

This novel paper presents a new computational approach for dynamics of quantum impurity models and other relevant topics for the condensed matter field. In particular, the authors present a modified real-time continuous-time hybridization-expansion quantum Monte Carlo solver for a time-dependent single-orbital Anderson impurity model. The presented method alleviates the dynamical sign problem by reducing the order of sampled diagrams and makes it possible to reach twice as long time scales in comparison to the standard method. This method is illustrated by calculating electric current through impurity in paramagnetic and spin-polarized cases. The idea of expanding around one single spin flavour could lead to further developments in the understanding of the cross-over between Falicov-Kimball and Hubbard physics.

### Y. Gobeil et al. receive the Select label

##### 1 August 2019

"Thermal conformal blocks" by Yan Gobeil, Alexander Maloney, Gim Seng Ng and Jie-qiang Wu has received the Select label. Warm congratulations to the authors!

This innovative article explores a foundational problem of determining the conformal blocks for a conformal field theory (CFT) at finite temperatures. They solve this issue for the specific case of one-point thermal correlators. The combination of field theoretic and holographic techniques gives confidence in the veracity of the result, and suggests how one might extend their result to other related blocks. This topic has not been explored in detail before, and therefore this article establishes the groundwork for future research.

### V Alba et al. receive the Select label

##### 8 July 2019

"Entanglement evolution and generalised hydrodynamics: interacting integrable systems" by Vincenzo Alba, Bruno Bertini and Maurizio Fagotti has received the Select label. Warm congratulations to the authors!

In this very readable paper, the authors study the entanglement evolution of integrable quantum models. In particular, they focus on the entanglement entropy after a global quench from inhomogeneous states. They combine the ideas of pair particle production with the formalism of generalised hydrodynamics to develop a formula capturing the dynamics of the entanglement entropy. They found that the half chain entanglement rate depends only on the physics at the interface, and it differs from the rate of exchange of thermodynamic entropy. This contrasts with the behaviour in free or homogeneous interacting integrable systems, where the two rates coincide. These results were tested in the Heisenberg chain, finding good agreement with DMRG simulations. This paper makes interesting points regarding the definition of the entanglement entropy, and it calls attention to several interesting directions for future research.

### University of Amsterdam provides substantial grant to SciPost

##### 10 June 2019

The University of Amsterdam has recently granted 60k to SciPost. This donation makes the UvA the most generous sponsor of our initiative up to now. We will make use of these funds to further develop our services and accelerate our expansion plans. As background to this, we have talked to Gerard Kohler from the UvA's central library. In the short interview hereby linked, he talks about the background reasons for this support, and his hopes for the future.

### In memoriam: Prof. dr Olga Borisovna Igonkina

##### 21 May 2019

It is with great sadness that we mark the passing of Prof. Olga Igonkina, Nikhef particle physicist and prominent member of the ATLAS experiment at CERN. She passed away on Sunday May 19th in Amsterdam, The Netherlands, at the young age of 45.

Prof. Igonkina was a prominently active contributor to SciPost, having organized the proceedings for the 15th International Workshop on Tau Lepton Physics (Amsterdam, 2018-09). She was a Fellow of our Editorial College and was always much appreciated for her dedicated hard work and ethics. We will miss her greatly. We express our most sincere condoleances to her family, friends and further colleagues.

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