# Théorie

# Strong coupling physics, holography and cosmology

Dear all,

I am pleased to invite you to my PhD defense which will take place on November 15th at 14:00 in room 454A Luc Valentin, 4th floor.

I will present my work on strong coupling physics, holography and cosmology which has been done at APC under the supervision of Francesco Nitti.

The defense will be followed by a pot in the salle de convivialité.

Best regards,

# Analysing arrival directions of ultra-high-energy cosmic rays with convolutional neural networks

# Cosmological Phonon Collider

# High-Energy Multimesssenger Emission from Supermassive Black Holes

# Cosmological Bootstrap and the Analytic Wavefunction

# Searching for Internal Absorption Signatures and Probing EBL Using Gamma-Rays from High-Redshift Blazars

point very close to the direction towards Earth. The powerful

gamma-ray beam from distant blazars represents a unique tool to

explore the environment along its path, and allows us to probe opacity

both inside the source and in the intergalactic medium. Internally,

gamma-rays experience attenuation due to photon-photon absorption, a

result of interactions with AGN-generated photon fields. This

interaction introduces distinct features in gamma-ray spectra. Upon

# Curvature on Curvature: Gravitational Lensing of Gravitational Waves.

# Multimessenger probes of superheavy dark matter decay and annihilation

# Chaotic behavior in field and string theory

My talk will be divided into two parts: In the first I will present a novel

measure of chaotic scattering amplitudes. For chaotic scattering the distribution function is given

by the β-ensemble of random matrix theory (RMT). We show that amplitudes of one highly

excited string (HES) state with two or three scalars in open bosonic string theory admit

this behavior. Quite remarkably this measure applies also to the distributin of non-trivial

zeros of the Riemann zeta function.