Neutron stars are the densest astrophysical objects in the universe. Cores
of neutron stars reach densities as high as those realized in ultrarelativistic
heavy-ion collisions studied in particle accelerators. In these collisions ordinary nuclear matter melts into a new phase of
elementary particle matter, quark matter. This naturally raises the question: does quark matter also exist...
The ground state of QCD in sufficiently strong magnetic fields and at moderate baryon densities was shown to carry a crystalline condensate of neutral pions: the chiral soliton lattice. As proved previously, this phase of matter is stable under thermal fluctuations. Recently, the effects of quantum fluctuations and finite temperature were calculated in detail within chiral perturbation theory....
The steeply falling jet spectrum induces bias on the medium modifications of jet observables in heavy-ion collisions. To explore this bias, we develop a novel analytic framework to study the quenched jet spectrum, and its cumulative. We include many energy-loss-related effects, such as soft and hard medium induced emissions, broadening, elastic scattering, jet fragmentation, cone size,...
In high-energy heavy-ion collisions, a quark-gluon plasma is produced. One way to study this exotic type of matter is to analyze the effect it has on high-energy partons traversing it. This leads to a rich phenomenology that commonly is referred to as jet quenching. High-energy partons propagating in the hot and dense medium mainly experience transverse momentum broadening which leads to...
All the ~50 confirmed gravitational wave events observed by the LIGO and Virgo collaboration thus far have been of compact binary mergers. In this talk I will present a fairly new method for computing the wave form produced by such inspirals using field theoretical methods, including Feynman diagrams, to calculate these effects of classical gravity.
The High Luminosity LHC (HL-LHC) upgrade requires that the planned Inner Tracker (ITk) of the ATLAS detector must be tolerant to extremely high radiation doses. Specifically, the innermost parts of the pixel system will have to withstand radiation fluences above $1\times10^{16}n_{eq}cm^{-2}$. Novel 3D silicon pixel sensors offer a superior radiation tolerance compared to conventional planar...
Despite the success of LCDM in explaining cosmological observables on scales spanning many orders of magnitude in both time and space, there are ingredients central to the model that are completely unknown, such as dark matter (DM), the dominant matter component of our universe. A wide range of DM candidates have therefore been proposed over the years, motivated by fundamental theories beyond...
Cosmic inflation is often described through the dynamics of a scalar field (called the inflaton), slow-rolling in a suitable potential. Quantum fluctuations during inflation can be shown to seed the temperature fluctuations of the CMB and following formation of structure in the Universe. The inflaton field must ultimately be identified with the expectation value of a quantum field, evolving in...
In this presentation, I will demonstrate how the dependence of the pion decay constant on the magnetic field can be calculated for QCD-Like theories with real quarks. This study is important, due to the fact that the dependence of the pion decay constant on the magnetic field plays an important role when investigating the properties of the phase diagram of QCD-Like theories, under the presence...
We will discuss linear uniformly accelerating (LUA) trajectories in a background Schwarzschild spacetime thus modelling the trajectories in the vicinity of a static black hole. Also, an analogous model is proposed in the simplest dynamic spacetime that permits black holes, the Vaidya spacetime. These LUA trajectories give rise to Rindler horizons which have been studied extensively due to...
An extended Higgs sector allows for reparametrizations, or different bases. These do not affect the physics. In addition, it can accommodate several genuine symmetries. These were identified some ten years ago in terms of reparametrization-invariant quantities. We have expressed these criteria in terms of physical quantities, masses and couplings.
Numerically approximating multidimensional posterior distributions can be very expensive
when evaluating the likelihood function involves expensive numerical computation.
At the same time many likelihoods in physics show a "speed hierarchy"
between the different dimensions of the parameter space which means that recomputing
the likelihood function is much more expensive when changing some...
Laser Interferometer Space Antenna (LISA), will be the first space based gravitational wave observatory, which is mainly funded by the European Space Agency (ESA). Planned for launch in the early 2030s, LISA is designed to detect GW sources spanning the whole history of the Universe. While the loudest sources will be resolved individually, the rest will combine into a stochastic GW background...
Exploring the use of Bayesian neural networks for the purpose of evaluating supersymmetric cross sections at next-to-leading order with reliable uncertainty estimates. Calculating cross sections is a central part of the search for new physics beyond the Standard Model, however, it is a time consuming endeavour. Machine learning methods can speed up the production process by learning the...
In general relativity, an apparent horizon is commonly used as a quasi-local boundary around a black hole region instead of the event horizon, which is a teleological surface. Apparent horizons have many useful applications in numerical relativity, however, they can be difficult to determine and are foliation dependent, i.e., observer dependent. Recently it has been proven that stationary...
The ALICE detector is undergoing an upgrade for Run 3 at the LHC. A new Inner Tracking System is part of this upgrade. The upgraded ALICE ITS features the ALPIDE, a Monolithic Active Pixel Sensor. Due to IC fabrication variations and radiation damages, the threshold values for the ALPIDE chips in ITS need to be measured and adjusted periodically to ensure the quality of data-taking. The...
