### Description

Chair: Guillaume Rostagni

Macroscopic Dark Matter (or Macros) are a general class of dark matter models with masses $\gtrsim M_{pl}$ (often parameterised in grams rather than GeV) and geometric cross sections $\sigma_\chi$. Due to their very low number density, the range of macro cross sections is relatively unconstrained by conventional DM detectors, and instead require novel detection methods with high exposure. Here...

By the AdS-CFT correspondence, a 4-point function in a CFT is equal to the scattering amplitude of particle states in the dual AdS gravitational theory. These important functions can also tell us other things, such as the spectrum of operators in a theory, and are heavily researched objects. The expressions for general 2- and 3-point functions in a CFT have explicitly known and very simple...

In this talk, I'll introduce some of the ingredients and motivations in twistor theory and sketch the geometrical idea underlying the Penrose transform in the simplest non-trivial case.

A more accurate measurement of the cross section of the production of four top quarks in proton-proton collisions is now possible, thanks to the increased centre-of-mass energy and luminosity of the Large Hadron Collider (LHC). This motivates a corresponding improved accuracy for the theoretical predictions. I will begin the talk by explaining the reproduction of previously known results for...

A new method of performing calculations in QFT is presented, in which algebraic manipulations are performed at the probability level and propagators are expressed in terms of Pauli-Jordan (commutator) and Hadamard (anti-commutator) functions. This novel approach can be made manifestly causal, with other potential advantages including avoiding infrared singularities. This method has been...

It is well known that the Kerr and Reissner-Nordstrom geometries exhibit near-horizon conformal symmetries; in this talk I will present a brief introduction to hidden conformal symmetries, namely symmetries that are not immediately manifest in the background geometry. These hidden symmetries reveal interesting properties of our Black Hole systems, both in traditional General Relativity and...

Recent results from the muon $g-2$ experiment at Fermilab suggest a possible discrepancy between the experimental value of and the theoretical prediction for the muon anomalous magnetic moment $a_\mu$. Results from lattice QCD and the recent CMD-3 experiment make the situation more complicated and raise further questions.

An updated theoretical prediction for $a_\mu$ should be prepared for...

Ideas from quantum information theory are becoming increasingly useful to tackle problems in quantum gravity. Gravity mediated entanglement has emerged as a novel idea to understand whether the gravitational field is (at least perturbatively) quantum. If gravity is quantum then two massive particles must become entangled through their gravitational interaction. In this work, we seek to...

Heavy Neutral Leptons (HNLs) are a popular extension of the Standard Model to explain the lightness of neutrino masses and the matter-antimatter asymmetry through leptogenesis. Cosmology can constraint the regime of active-sterile neutrino mixing in a standard Seesaw scenario of neutrino mass generation for HNL masses around $m_N \lesssim 1$~GeV. Motivated by this, we analyse HNL-ALP coupling...