University of Alberta

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19922026

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

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315 papers · 1 filter

hep-th2024

Enumerative geometry and modularity in two-modulus K3-fibered Calabi-Yau threefolds

Charles Doran, Boris Pioline, Thorsten Schimannek

Motivated in part by the modular properties of enumerative invariants of K3-fibered Calabi-Yau threefolds, we introduce a family of 39 Calabi-Yau mirror pairs $(X, Y)$ with $h_{1,1}…

hep-th2023★ 8 cited

Ring wormholes and time machines

Valeri P. Frolov, Pavel Krtous, Andrei Zelnikov

In the present paper we discuss properties of a model of a ring wormhole, recently proposed by Gibbons and Volkov. Such a wormhole connects two flat spacetimes which are glued thro…

hep-th2023★ 2 cited

Zero Modes of Fermions Trapped by Giant Vortices

Logan Gates, Alexander A. Penin

Zero-energy solutions of the Dirac equation for the fermions bound to giant vortices of large winding number $n$ are studied in the abelian Higgs and Chern-Simons Higgs models. The…

hep-th2023★ 6 cited

Chiral anomalies in black hole spacetimes

Valeri P. Frolov, Alex Koek, Jose Pinedo Soto +1

We study the properties of chiral anomalies in a wide class of spacetimes which possess a principal Killing-Yano tensor. This class includes metrics of charged rotating black holes…

hep-th2021★ 1 cited

FZZ-triality and large $N = 4$ super Liouville theory

Thomas Creutzig, Yasuaki Hikida

We examine dualities of two dimensional conformal field theories by applying the methods developed in previous works. We first derive the duality between $SL(2|1)_k/(SL(2)_k \otime…

hep-th2021★ 7 cited

Bouncing cosmology in the limiting curvature theory of gravity

Valeri P. Frolov, Andrei Zelnikov

In this paper we discuss models satisfying the limiting curvature condition. For this purpose we modify the Einstein-Hilbert action by adding a term which restricts the growth of c…

hep-th2021

Correlator correspondences for subregular $W$ -algebras and principal $W$ -superalgebras

Thomas Creutzig, Yasuaki Hikida, Devon Stockall

We examine a strong/weak duality between a Heisenberg coset of a theory with $sl_{n}$ subregular $W$ -algebra symmetry and a theory with a $sl_{n ∣1}$ -s…

hep-th2021★ 8 cited

A Theory of Giant Vortices

Alexander A. Penin, Quinten Weller

We elaborate a theory of giant vortices [1] based on an asymptotic expansion in inverse powers of their winding number $n$ . The theory is applied to the analysis of vortex solution…

hep-th2021★ 15 cited

Two-dimensional black holes in the limiting curvature theory of gravity

Valeri P. Frolov, Andrei Zelnikov

In this paper we discuss modified gravity models in which growth of the curvature is dynamically restricted. To illustrate interesting features of such models we consider a modific…

hep-th2021★ 4 cited

Size-effect at finite temperature in a quark-antiquark effective model in phase space

G. X. A. Petronilo, R. G. G. Amorim, S. C. Ulhoa +3

A quark-antiquark effective model is studied in a toroidal topology at finite temperature. The model is described by a Schrödinger equation with linear potential which is embedded…

hep-th2021

Lifshitz theory for a wedge

R. Krechetnikov, A. Zelnikov

We develop the Lifshitz theory of van der Waals forces in a wedge of a dielectric material. The non-planar geometry of the problem requires determining point-wise distribution of s…

hep-th2021★ 4 cited

Scarf for Lifshitz

A. Zelnikov, R. Krechetnikov

Polarization of a vacuum as well as of dispersive and dissipative dielectric media with piece-wise and smooth inhomogeneities is studied with the goal to clarify the question of re…

hep-th2020★ 1 cited

Nonlocal scalar field in an external potential: WKB approximation

Valeri P. Frolov

We consider a nonlocal theory of a scalar massive field in a flat spacetime background in the presence of an external potential and construct WKB solutions for this theory. We use…

hep-th2020★ 2 cited

Ultrarelativistic charged and magnetized objects in non-local ghost-free electrodynamics

Jens Boos, Valeri P. Frolov, Jose Pinedo Soto

We study a non-local ghost-free Lorentz invariant modification of the Maxwell equations in four- and higher-dimensional flat spacetimes. We construct solutions of these equations f…

hep-th2020★ 1 cited

Resonant particle creation by a time-dependent potential in a nonlocal theory

Jens Boos, Valeri P. Frolov, Andrei Zelnikov

Considering an exactly solvable local quantum theory of a scalar field interacting with a $δ$ -shaped time-dependent potential we calculate the Bogoliubov coefficients analytically…

hep-th2020★ 5 cited

Higher rank FZZ-dualities

Thomas Creutzig, Yasuaki Hikida

We propose new strong/weak dualities in two dimensional conformal field theories by generalizing the Fateev-Zamolodchikov-Zamolodchikov (FZZ-)duality between Witten's cigar model d…

hep-th2020★ 9 cited

What becomes of vortices when they grow giant

Alexander A. Penin, Quinten Weller

We discuss vortex solutions of the abelian Higgs model in the limit of large winding number $n$ . We suggest a framework where a topological quantum number $n$ is associated with a…

hep-th2020★ 5 cited

Lorentzian Spectral Geometry with Causal Sets

Yasaman K. Yazdi, Marco Letizia, Achim Kempf

We study discrete Lorentzian spectral geometry by investigating to what extent causal sets can be identified through a set of geometric invariants such as spectra. We build on prev…

hep-th2020

Bhabha scattering in Very Special Relativity at finite temperature

A. F. Santos, Faqir C. Khanna

In this paper the differential cross section for Bhabha scattering in the Very Special Relativity (VSR) framework is calculated. The main characteristic of the VSR is to modify the…

hep-th2020★ 6 cited

An effective field theory approach to monopolium

L. M. Abreu, M. de Montigny, P. P. A. Ouimet

In this work we investigate the interaction between spin-zero and spin-one monopoles by making use of an effective field theory based on two-body and four-body interaction parts. I…

hep-th2020

Casimir effect and Stefan-Boltzmann law at finite temperature in a Friedmann-Robertson-Walker universe

A. F. Santos, S. C. Ulhoa, Faqir C. Khanna

A spatially flat Friedmann-Robertson-Walker background with a general scale factor is considered. In this space-time, the energy-momentum tensor of the scalar field with a general…

hep-th2020★ 14 cited

Correspondences among CFTs with different W-algebra symmetry

Thomas Creutzig, Naoki Genra, Yasuaki Hikida +1

W-algebras are constructed via quantum Hamiltonian reduction associated with a Lie algebra $g$ and an $sl (2)$ -embedding into $g$ . We derive corresp…

hep-th2020★ 27 cited

Towards Spacetime Entanglement Entropy for Interacting Theories

Yangang Chen, Lucas Hackl, Ravi Kunjwal +3

Entanglement entropy of quantum fields in gravitational settings is a topic of growing importance. This entropy of entanglement is conventionally computed relative to Cauchy hypers…

hep-th2019★ 22 cited

Ghost-free modification of the Polyakov action and Hawking radiation