Collision models (CMs) describe quantum systems interacting sequentially with elements of an environment, termed ancillas. These simple models are valuable for analyzing non-Markovian quantum dynamics by controlling environmental memory through feedback mechanisms. Their simplicity and versatility have led to applications in quantum optics, quantum information, and quantum thermodynamics.
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Under certain conditions, an arbitrary spacetime can be modelled as an equivalent optical medium characterized by properties such as permittivity, which modifies the speed of light propagation and, consequently, the structure of light cones. To explore quantum effects in this context, we investigate the evolution of a single electromagnetic field mode in a cavity where the permittivity depends...
The most powerful cosmic engines in our universe are fueled by compact objects such as black holes and neutron stars. These cosmic engines consume large amounts of material and expel matter in the form of jets travelling at near the speed of light. Recent groundbreaking discoveries of gravitational waves from systems harbouring compact objects and the direct imaging of the black hole shadows...
Since the derivation of a well-defined D→4 limit for 4D Einstein-Gauss-Bonnet (4DEGB) gravity coupled to a scalar field, there has been considerable interest in testing it as an alternative to Einstein's general theory of relativity. This theory hosts interesting compact star solutions which can be smaller in radius than a Schwarzschild black hole of the same mass in general relativity (GR)....
Our concordance cosmological model describes the history and large-scale structure of the universe using a few key parameters, one of which is the clustering of matter due to density fluctuations in the early universe. Modern constraints on this parameter using different observational methods are in statistical tension. Our ability to resolve this tension is limited by the parameter’s...
