INPP Demokritos-APCTP meeting and HOCTOOLS-II mini-workshop

Sep 30, 2024, 9:00 AM → Oct 4, 2024, 7:00 PM Europe/Athens

The National Centre for Scientific Research (NCSR) “Demokritos” and the Asia-Pacific Center for Theoretical Physics (APCTP) have recently launched a cooperation which aims to strengthen the ties between Greece and South Korea in the field of Theoretical Physics.

The meeting marks the beginning of the collaboration between the two institutes. It has been scheduled to take place at the Institute of Nuclear and Particle Physics (INPP) in Athens on 30 September – 4 October 2024, with speakers from the faculties of both institutes, along with a number of invited speakers from Europe and the Asia-Pacific region.

The meeting is held together with the HOCTools-II mini-workshop. HOCTools-II, “High Order Calculations and Tools for High Energy Colliders”, is a project funded by the HFRI. The aim of the project is to provide the necessary developments in concepts and methods, in calculations and computational tools, that allow for the most precise theoretical predictions of scattering processes.

The meeting/workshop will take place in the Institute of Nuclear and Particle Physics (INPP), seminar room "Themis Paradellis" 

Videoconference: https://us02web.zoom.us/j/82035111250

Dinner venue: https://maps.app.goo.gl/jE7zLQLd8S2EU2iX8 

Dinner and Guided tour: Please be at the Benaki musem at 18:55 for the guided tour. The dinner will start at 20:00. 

Invited Speakers

Simon Badger (Turin)

Constantin Bachas (LPENS)^zoom

Michal Czakon (Aachen)^zoom

David Kosower (IPhT)

Bum-Hoon Lee (CQUeST)

Sungjay Lee (KIAS)

Pierpaolo Mastrolia (Padua)

Sang-Jin Sin (Hanyang)

 

Speakers from INPP-D

Minos Axenides (INPP)

Giuseppe Bevilacqua (INPP)

Nikolaos Dokmetzoglou (INPP)

Kostas Filippas (INPP)

Stam Nicolis (Tours)^zoom

Costas Papadopoulos (INPP)

Georgios Papathanasiou (City, University of London)

George Savvidy (INPP)

Aris Spourdalakis (INPP)

 

Speakers from APCTP

Heribertus Bayu Hartanto (APCTP)

Matti Jarvinen (APCTP)

Georgios Linardopoulos (APCTP)

Kanghoon Lee (APCTP)

Matthew Roberts (APCTP)

Christopher Rosen (Crete)

 

Organizing Committee

Minos Axenides

Yunkyu Bang 

Jae-Hyung Jeon

Kanghoon Lee

Georgios Linardopoulos

Christos Markou

Costas Papadopoulos

Matthew Roberts

 

ΜΠΕΝΑΚΗ ΜΕΝΟΥ Γ SUMMER 2024.pdf

Monday, September 30

9:45 AM → 10:00 AM Welcome

Speaker: Christos Markou (Director of INPP)

10:00 AM → 11:00 AM Holographic Mean field theory and Kondo lattice.

Speaker: Sang-Jin Sin

2409_athens.pdf

11:00 AM → 12:00 PM Classification of Fermionic RCFTs and Topological Phases Revisited

Speaker: Sungjay Lee

On Classification of Fermionic RCFTs_Athens.pdf

12:00 PM → 2:00 PM Lunch Break

2:00 PM → 3:00 PM Schwarzschild Black Hole from Perturbation Theory to All Orders

Applying the quantum field theoretic perturbiner approach to Einstein gravity, we compute the metric of a Schwarzschild black hole order by order in perturbation theory. Using recursion, this perturbative calculation can be carried out in de Donder gauge to all orders in Newton’s constant. The result is a geometric series which is convergent outside a disk of finite radius, and it agrees within its region of convergence with the known de Donder gauge metric of a Schwarzschild black hole. It thus provides a first all-order perturbative computation in Einstein gravity with a matter source. I’ll also discuss the generalization to the binary black holes.

Speaker: Kanghoon Lee

Kanghoon Lee.pdf

3:00 PM → 4:00 PM Predictions for dense matter and neutron stars from the gauge/gravity duality

The gauge/gravity duality, combined with information from lattice QCD, nuclear theory, and perturbative QCD, can be used to obtain predictions for the equation of state and transport in hot and dense QCD. I give an overview of an approach based on the holographic V-QCD model, which includes both nuclear and quark matter phases, separated by a first order phase transition. I demonstrate that the model includes an spatially modulated instability in the deconfined phase, which potentially extends to the region reachable in lattice and experimental studies in near future. By using the model in state-of-the-art simulations of neutron star binaries, I study the formation of quark matter during the merger process, and its effect on the threshold mass for prompt collapse into a black hole. I also discuss analysis of the bulk viscosity and predictions for neutrino transport in the quark matter phase.

Speaker: Matti Jarvinen

240928_jarvinen.pdf

4:00 PM → 4:30 PM Coffee Break

4:30 PM → 5:30 PM Invariant tension in gravity

Speaker: Constantin Bachas

Δημοκριτος30:9.pdf

5:30 PM → 6:30 PM Landau singularities from Whitney stratifications

Speaker: Georgios Papathanasiou

Papathanasiou_Demokritos2024.pdf

Tuesday, October 1

10:00 AM → 11:00 AM Finite Feynman Integrals

Classifying and organizing Feynman integrals according to their degree of divergence may be a useful tool in presenting scattering amplitudes. In this talk, I focus on the first step: systematically organizing and finding finite Feynman integrals. I will briefly discuss an approach based on Landau equations. I will then focus mostly on an approach based on Newton polytopes.

Speaker: David Kosower

Finite Feynman Integrals (INPP Demokritos workshop, Oct 1, 2024).pdf

Finite Feynman Integrals (INPP Demokritos workshop, Oct 1, 2024).pptx

11:00 AM → 12:00 PM Subleading effects in soft-gluon emission at one-loop in massless QCD

Speaker: Michal Czakon

talk.pdf

12:00 PM → 2:00 PM Lunch Break

2:00 PM → 3:00 PM Dilaton-Einstein-Gauss-Bonnet Gravity and its Cosmological Implication

The dilaton-Einstein-Gauss-Bonnet(dEGB) Gravity is one of the simplest extensions of Einstein's gravity with the higher curvature term. After some motivation to go beyond Einstein's Gravity models, we briefly describe the dEGB model through the black holes. Unlike Einstein's gravity, we explain the existence of a minimum mass below which the black hole cannot be formed, which is the most prominent property. Then, we move on to the implication of this theory on the cosmological evolution. The major message is that it opens new possible phases: “Slow-roll”, “fast-roll”, and “kination” at the higher temperatures, in addition to the well-accepted radiation dominant, matter dominant, and cosmological constant dominant phases of the standard cosmological model. We also mention briefly the WIMP physics and gravitational waves to put the bounds on the parameters of dEGB gravity theory.

Speaker: Dr Bum-Hoon Lee

24 10 01 GB BH Cosmol-APCTP v2-2.pdf

3:00 PM → 4:00 PM Intersection Theory for Fundamental Physics

Speaker: Pierpaolo Mastrolia

mastrolia_ncsr_demokritos.pdf

4:00 PM → 4:30 PM Coffee Break

4:30 PM → 5:30 PM OPP at two loops

Speaker: Konstantinos Papadopoulos (Nat. Cent. for Sci. Res. Demokritos (GR))

demokritos-2024.pdf

5:30 PM → 6:30 PM Towards numerical computation of dimensionally regularised QCD helicity amplitudes

Speaker: Giuseppe Bevilacqua

HOCTOOLS_Bevilacqua.pdf

Wednesday, October 2

10:00 AM → 6:30 PM Free day

7:30 PM → 10:30 PM Banquet

Thursday, October 3

10:00 AM → 11:00 AM Two loop QCD corrections to multiscale amplitudes: Progress towards ttj, wγγ and hbb final states

I will discuss the progress towards providing the missing double virtual corrections to the listed final states using modern computational tools.

Speaker: Simon Badger

SB_Athens_2024-v2.pdf

11:00 AM → 12:00 PM NNLO QCD phenomenology for 2-to-3 scattering process at the LHC: Wbb and photon+dijet final states

Speaker: Heribertus Bayu Hartanto

Bayu_Athens_2024.pdf

12:00 PM → 2:00 PM Lunch Break

2:00 PM → 3:00 PM Two-loop amplitude reduction in the HELAC framework

I will present recent progress in constructing a generic two-loop amplitude reduction algorithm within the computational framework of HELAC. Following the well-known OPP reduction approach at one loop, a two loop amplitude approach is developed. I will also discuss the differences between the 4-2ε and pure 4 dimensional reduction fitting.

Speaker: Aris Spourdalakis

2024_Demokritos_Talk (2).pdf

3:00 PM → 4:00 PM Analytic Continuation of Five-Point Two-Loop Master Integrals

Speaker: Nikos Dokmetzoglou

NCSRD_INPP_APCTP_Meeting_2024_NikosDokmetzoglou.pdf

4:00 PM → 4:30 PM Coffee Break

4:30 PM → 5:30 PM Magnetic Defects in Conformal Field Theory

Magnetic solenoids in quantum systems can have lead to novel and interesting physics in the deep infrared, owing to the fact that they can be classified by a number, the magnetic flux of the solenoid. We review the general physics of co-dimension two defects with an eye towards studying magnetic defects, and discuss new central charges that arise in these mixed dimensional systems. We comment on holographic constructions of these defects and give some physical observables.

Speaker: Matthew Roberts

demokritos-apctp_mag_defects.pdf

5:30 PM → 6:30 PM A (super)gravitational perspective on magnetic defects

Localized deformations of quantum field theories present interesting
opportunities to enhance our understanding of the features of such
theories at different length scales. This class of deformations is of
particular interest in light of its applicability to inhomogeneities
in cosmological settings, as well as interfaces and impurities in
condensed matter systems.

Despite the inherent interest of these systems, they are comparatively
difficult to study (especially at strong coupling). Recently, progress
has been made in quantifying the properties of these systems by
employing a "holographic" duality that rephrases these deformed
quantum field theories in terms of the variables of a dual higher
dimensional (super)gravity theory. I provide a brief introduction to
this application of gauge/gravity duality, focusing on the
gravitational dual of a magnetic superconformal defect. I further
overview recent notable results in this direction.

Speaker: Christopher Rosen

a8hna24.pdf

Friday, October 4

10:00 AM → 11:00 AM Landscape of Yang Mills vacuum fields and condensation of magnetic fluxes in QCD

The moduli space of covariantly constant gauge fields is infinite-dimensional and describes non-perturbative solutions of the Yang-Mills equation of superposed chromomagnetic flux tubes (vortices) of opposite magnetic charges. These gauge field configurations are stretched along the potential valleys of a constant energy density and are separated by potential barriers between classically degenerate vacua that are forming a complicated potential landscape of the QCD vacuum. It is suggested that the solutions describe the condensate of dense chromomagnetic vortices representing a dual analog of the Cooper pairs condensate in a superconductor. The solutions represent exact non-perturbative solutions of the YM equation in the background chromomagnetic field.

Speaker: George Savvidy

Savvidy_presentaion.pdf

11:00 AM → 12:00 PM Dielectric top membranes in plane-wave backgrounds

We investigate the large-N limit of the BMN matrix model by means of classical bosonic membranes that have spherical topology and spin inside the 11-dimensional maximally supersymmetric plane-wave background. First, we classify all possible M2-brane configurations based on the distribution of their components inside the SO(3) × SO(6) symmetric plane-wave spacetime. We then formulate some simple but very representative ansatze of dielectric tops that rotate in this space. We examine the radial and angular/multipole stability for a wide range of these configurations, locating their regions of stability and instability. We also demonstrate a ”cascade” phenomenon for the membrane instabilities by extending the analysis of fluctuations to higher orders of perturbation theory

Speaker: Georgios Linardopoulos

Linardopoulos.pdf

12:00 PM → 2:00 PM Lunch Break

2:00 PM → 3:00 PM How Arnol’d cat maps probe the properties of black holes

Speaker: Stam Nicolis

APCTP_NRCPS2024-Nicolis.pdf

3:00 PM → 4:00 PM Nested holography

Speaker: Kostas Filippas

DUALITY.pdf