As a contribution towards quantizing three-dimensional gravity, we show at the classical level that Euclidean three-dimensional Einstein gravity with a negative cosmological constant is uplifted to the SU(2)-invariant sector of Kodaira-Spencer gravity on a Calabi-Yau three-fold. Kodaira-Spencer gravity appears in the target space description of the B-model topological string theory and describes deformations of a complex structure. We prove that given a reference solution of Einstein gravity in the first-order formulation, a second off-shell configuration uplifts to a unique complex structure deformation in six dimensions. If the configuration satisfies Einstein’s equations, the complex structure deformation is integrable, i.e. a solution of Kodaira-Spencer gravity. We demonstrate the uplift explicitly for Bañados solutions. Our construction embeds three-dimensional gravity into topological string theory and AdS /CFT duality into twisted holography.

Germany

Johanna Erdmenger

United States

Jonathan Karl

Jani Kastikainen

René Meyer

Henri Scheppach

Topological Einstein gravity as Kodaira-Spencer gravity

<p>The IceCube Upgrade is an extension of the existing IceCube Neutrino Observatory and will be deployed in the 2025–2026 austral summer. It will significantly improve the sensitivity of the detector to atmospheric neutrino oscillations. The existing 86-string IceCube array contains a dense in-fill known as DeepCore which is optimized to measure neutrinos with energies down to a few GeV. The IceCube Upgrade will consist of seven new densely instrumented strings placed within the DeepCore volume to further enhance the performance in the GeV energy range. The additional strings will feature new optical modules, each containing multiple photomultiplier tubes (PMTs), in contrast to the existing modules that each contain a single PMT. This will more than triple the number of PMT channels with respect to the current IceCube configuration, allowing for improved detection efficiency and reconstruction performance at GeV energies. We describe necessary updates to simulation, event selection, and reconstruction to accommodate the higher data rates observed by the upgraded detector and the addition of multi-PMT modules. We determine the expected sensitivity of the IceCube Upgrade to the atmospheric neutrino oscillation parameters <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>sin</mi></mrow><mrow><mn>2</mn></mrow></msup><msub><mrow><mi>θ</mi></mrow><mrow><mn>23</mn></mrow></msub></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Δ</mi><msubsup><mi>m</mi><mn>32</mn><mn>2</mn></msubsup></math>, the appearance of tau neutrinos and the neutrino mass ordering. The IceCube Upgrade will provide neutrino oscillation measurements that are of similar precision to those from accelerator experiments, while providing complementarity by probing higher energies and longer baselines, and with different sources of systematic uncertainties.</p>

R. Abbasi

M. Ackermann

New Zealand

J. Adams

S.K. Agarwalla

Belgium

J.A. Aguilar

Denmark

M. Ahlers

J.M. Alameddine

S. Ali

N.M. Amin

K. Andeen

C. Argüelles

Y. Ashida

S. Athanasiadou

S.N. Axani

R. Babu

X. Bai

J. Baines-Holmes

A. Balagopal V.

S.W. Barwick

S. Bash

V. Basu

R. Bay

J.J. Beatty

J. Becker Tjus

P. Behrens

Sweden

J. Beise

C. Bellenghi

B. Benkel

S. BenZvi

D. Berley

Italy

E. Bernardini

D.Z. Besson

E. Blaufuss

L. Bloom

S. Blot

I. Bodo

F. Bontempo

J.Y. Book Motzkin

C. Boscolo Meneguolo

S. Böser

O. Botner

J. Böttcher

J. Braun

B. Brinson

Canada

Z. Brisson-Tsavoussis

Australia

R.T. Burley

D. Butterfield

M.A. Campana

K. Carloni

J. Carpio

S. Chattopadhyay

N. Chau

Z. Chen

D. Chirkin

S. Choi

B.A. Clark

A. Coleman

P. Coleman

G.H. Collin

D.A. Coloma Borja

A. Connolly

J.M. Conrad

R. Corley

D.F. Cowen

C. De Clercq

J.J. DeLaunay

D. Delgado

T. Delmeulle

S. Deng

P. Desiati

K.D. de Vries

G. de Wasseige

T. DeYoung

J.C. Díaz-Vélez

S. DiKerby

M. Dittmer

A. Domi

L. Draper

L. Dueser

D. Durnford

K. Dutta

M.A. DuVernois

T. Ehrhardt

L. Eidenschink

A. Eimer

P. Eller

E. Ellinger

D. Elsässer

R. Engel

H. Erpenbeck

W. Esmail

S. Eulig

J. Evans

P.A. Evenson

K.L. Fan

K. Fang

Japan

K. Farrag

A.R. Fazely

Taiwan

A. Fedynitch

N. Feigl

Physics potential of the IceCube Upgrade for atmospheric neutrino oscillations

We study the transport properties of relativistic fluids induced by quantum anomalies in presence of explicit symmetry breaking. To this end we consider a holographic Einstein-Maxwell model in 5 dimensions with pure gauge and a mixed gauge-gravitational Chern-Simons terms, coupled with a scalar field. To study the chiral vortical effects and the energy transport sector, apart from the chiral magnetic effects, we have considered the full backreaction of the gauge field on the metric. We have studied the anomalous effects by using Kubo formulae involving correlators of the charged currents and the energy current. Our findings reveal that, in the presence of explicit symmetry breaking, anomaly-induced transport phenomena can extend beyond anomalous currents and affect non-anomalous sectors as well. In particular, we find that all the conductivities display a distinct sensitivity to the mass parameter controlling the symmetry breaking, thus reflecting the interplay between anomaly coefficients and explicit symmetry breaking terms. These findings highlight the role played by pure gauge and mixed gauge-gravitational anomalies in holographic transport, and their importance for strongly coupled systems with broken symmetries.

India

Ashis Tamang

Nishal Rai

Spain

Karl Landsteiner

Eugenio Megías

Anomaly induced transport from symmetry breaking in holography

The SU(2)–gauged custodial two-Higgs-doublet model, which shares the same global-symmetry properties with the standard model, is studied non-perturbatively on the lattice. The additional Higgs doublet enlarges the scalar spectrum and opens the possibility for spontaneous breaking of the global symmetry. In this work we start by showing the occurrence of spontaneous breaking of the custodial symmetry in a region of the parameter space of the model. Following this, both the spectrum and the running of the gauge coupling of are examined at weak quartic couplings in the presence of the custodial symmetry. The calculations are performed with energy cutoffs ranging from 300 to 600 GeV on a line of constant standard model physics, obtained by tuning bare couplings to fix the ratio between the masses of the Higgs and the $\textit{W}$ bosons, as well as the value of the renormalized gauge coupling at the scale of the $\textit{W}$ boson mass. The realizable masses for the additional scalar states are explored. For the choice of bare quartic couplings in this work, the estimated lower bound of these masses is found to be well below the $\textit{W}$ boson mass, and independent of the cutoff. We also study the finite temperature electroweak transition along this line of constant standard model physics, revealing properties of a smooth crossover behavior.

Guilherme Catumba

Atsuki Hiraguchi

Wei-Shu Hou

Karl Jansen

Ying-Jer Kao

C.J. Lin

Alberto Ramos

Mugdha Sarkar

Lattice investigation of custodial two-Higgs-doublet model at weak quartic couplings

We initiate the study of stability and pseudospectra of complex momentum modes of asymptotically anti-de Sitter black holes. Similar to quasinormal modes, these can be defined as the poles of the holographic Green’s function, albeit for real frequency and complex momentum. Their pseudospectra are in stark contrast to the pseudospectra of quasinormal modes of AdS black holes. Contrary to the case of quasinormal mode pseudospectra, the resolvent is well-defined, and the numerical approximation shows fast convergence. At zero frequency, complex momentum modes are stable normal modes of a Hermitian operator. Even for large frequencies, they show only comparatively mild spectral instability. We also find that local potential perturbations cannot destabilize the lowest complex momentum mode.

David García-Fariña

Pau Romeu

Pablo Saura-Bastida

Pseudospectra of complex momentum modes