### Conveners

#### Student's Talks

- Vincenzo Salzano (University of Szczecin)

#### Student's Talks: Student's Talks

- Edward Malec ()

The gauge/gravity duality has constituted as a powerful tool for analysis of strongly coupled condensed matter systems on a weakly coupled gravitational side in AdS spacetime.

It has been shown that the holographic theory reproduces several properties of superconducting/superfluid state known from conventional quantum mechanical considerations and experiments.

This has been extended by...

Gravitational waves offer a unique window to study the strong-field regime of general relativity. In 1916-18, Einstein showed their existence in linearized approximation which was followed by a period of confusion. Finally cemented theoretically by Bondi, Sachs, Trautman gravitational waves are an important tool to discover new information about fundamental gravity effects.

One of the...

We present a cosmological model where the cosmological constant is a topological invariant. The cosmological constant is derived from the curvature of exotic $R^4$ embedded in $K3\# \overline{\mathbb{C}P^2}$. Both of the manifolds are perfectly smooth however the 3-diemnsional slices they generate contain topological changes. Then the value of cosmological constant is expressed via...

The presence of a gravitational field modifies significantly particle decay rates compared to the usual Minkowski space results. Because of the lack of energy conservation, new particle processes, forbidden in Minkowski space, are to be considered leading to new Feynman diagrams even at first order. I will give a brief introduction to the problems one encounters when trying to calculate decay...

Space-time curvature affects quantum uncertainty. This effect is commonly known as the Extended Uncertainty principle. In this talk I briefly present a method to calculate the influence of curvature on the uncertainty relation. Moreover I apply it to cosmological and Rindler horizons and interpret the results in the context of horizon thermodynamics.

In my talk I will present a method to quantise and solve the dynamics of gravitational waves in a quantum Friedmann-Lemaitre-Robertson-Walker spacetime filled with radiation.

The classical model is formulated in the ADM formalism. The system is then de-parametrised and reduced phase space is found. With the use of phase space symmetry respecting quantisation map the perturbed quantum FLRW...

Antisymmetric tensor fields arise naturally in superstring theory as well as in some theories with broken Lorentz invariance. However, models containing antisymmetric tensor fields often include anisotropic pressure. I will present a general prescription for constructing ansäzte for antisymmetric tensor fields for use in cosmology. With a series of coordinate-dependent constraints I will show...

In light of the promising and imminent multi-messenger observational era, we suggest a method to constrain the cosmological background by future observation involving gravitational lensing of radiation emitted by a gravitational wave source.

We measure the impact of different cosmological parameters in the value of the time delay due to gravitational lensing. The measured time delay is...