REMINDER - Joint ICTP-SISSA-UniTS Physics Seminars TOMORROW @ICTP both IN PERSON - (Hartnoll and Hanada)

[HECAP - Margherita Di Giovannantonio]

*_Joint ICTP-SISSA-UniTS Seminars_**__*

*09 April *2025

/!!!Please note these seminars will be both *in person only*!! Unusual 
*venue: Euler Lecture Hall*!/
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/

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*14:30 - _Euler LH _- https://indico.ictp.it/event/10940/
<https://indico.ictp.it/event/10940/> *


Sean Hartnoll (University of Cambridge)


*"The Conformal Primon Gas at the End of Time"*

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_Abstract_
It is believed, following the work of BKL 50 years ago, that the 
classical dynamics of general relativity greatly simplifies close to 
  singularities such as those inside black holes or at the Big Bang. 
Each point in space evolves separately, with dynamics that is equivalent 
to the motion of a particle bouncing within the fundamental domain of 
the modular group. I will explain how the emergent conformal and modular 
symmetries in this regime suggest possible dual formulations of the 
physics. The mathematical language that pertains is that of L-functions. 
These share key properties of the Riemann zeta function, including 
nontrivial zeros and a representation in terms of prime numbers. I will 
describe the physical consequences of these facts.



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*16:00 /- /**_Euler LH_**-**//https://indico.ictp.it/event/10941/
*

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*

Masanouri Hanada (Queen Mary University of London)

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*"Where are D-Branes?"*

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_Abstract_

Maximal Super Yang-Mills theory, including the D0-brane matrix model, 
can be viewed as a bound state of D-branes and strings, at least 
intuitively. In this framework, where are the D-branes located in the 
emergent geometry?

To be concrete, let us focus on the ground state. Many, including myself 
before 2021, have believed in a 'profound' picture: D-branes are smeared 
out, forming a kind of fuzz, from which the dual gravitational geometry 
emerges. In this talk, I will argue that this picture is incorrect, and 
the truth is much simpler --- and perhaps, even mundane: D-branes sit at 
the center of the bulk, with no excited strings; they form a 
supersymmetric black hole, whose horizon vanishes and is therefore 
invisible. This result comes from recognizing the importance of wave 
packets in the space of matrices. Coupled with partial deconfinement, it 
offers a straightforward interpretation of black hole entropy as 
entanglement between matrix degrees of freedom. Additionally, we observe 
an intriguing interplay between the wave packet and entanglement between 
spatial regions in quantum field theory. This provides a natural 
connection between two seemingly distinct mechanisms of emergent 
holographic geometry: one arising from entanglement, and the other from 
matrix eigenvalues.




References
arXiv:2102.08982 <arXiv:2102.08982>, "Bulk geometry in gauge/gravity 
duality and color degrees of freedom"
arXiv:2204.06472 <arXiv:2204.06472>, "Matrix Entanglement," with Vaibhav 
Gautam, Antal Jevicki, and Cheng Peng
arXiv:2406.13364 <arXiv:2406.13364>, "Operator algebra, quantum 
entanglement, and emergent geometry from matrix degrees of freedom," 
with Vaibhav Gautam and Antal Jevicki
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