HATIFI, Mohamed Di Molfetta, Giuseppe Debbasch, Fabrice Brachet, Marc

A simple Discrete-Time Quantum Walk (DTQW) on the line is revisited and given an hydrodynamic interpretation through a novel relativistic generalization of the Madelung transform. Numerical results show that suitable initial conditions indeed produce hydrodynamical shocks and that the coherence achieved in current experiments is robust enough to si...

Vinet, Jean-Yves Christensen, Nelson Dinu-Jaeger, Nicoleta Lintz, Michel Man, Nary Pichot, Mikhael

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Funcke, Lena

The Standard Model of particle physics and its implications for cosmology leave several fundamental questions unanswered, including the absence of CP violation in strong interactions and the origins of neutrino masses, dark matter, and dark energy. The most popular directions of model building beyond the Standard Model usually focus on new physics ...

Andrzejewski, Krzysztof

Focusing on the maximal conformal symmetry of vacuum solutions to the Einstein equations, conserved charges associated with conformal generators are discussed. The meaning of these charges is given by means of the Lewis invariants which subsequently are used to solve explicitly equations of motion for a particle in some plane gravitational waves.

Finn, Kieran Karamitsos, Sotirios Pilaftsis, Apostolos

We develop a quantum effective action for scalar-tensor theories of gravity which is both spacetime diffeomorphism invariant and field reparameterisation (frame) invariant beyond the classical approximation. We achieve this by extending the Vilkovisky--DeWitt formalism, treating both the scalar fields and the components of the gravitational tensor ...

Kalita, Surajit Mukhopadhyay, Banibrata

A number of recent observations have suggested that the Einstein's theory of general relativity may not be the ultimate theory of gravity. The f(R) gravity model with R being the scalar curvature turns out to be one of the best bet to surpass the general relativity which explains a number of phenomena where Einstein's theory of gravity fails. In th...

Vilensky, Ilya

In this dissertation we study the dynamics of loop quantum gravity and its applications. We propose a tunneling phenomenon of a black hole-white hole transition and derive an amplitude for such transition using the spinfoam framework. We investigate a special class of kinematical states for loop quantum gravity - Bell spin networks - and show that ...

Craig, Walter Reddy, Mikale

We solve the source free electromagnetic wave equation in Friedmann-Robertson-Walker space-times for curvature $K=0$ and $K=-1$. Deriving a solution expression in the form of spherical means we deduce and compare two properties of the Maxwell propagator namely, decay rates, as well as continuity through the space-time singularity to that of the sca...

Turconi, Margherita Harder, Thomas Soulard, Rémi Chaibi, Walid

A key action for enhancing the sensitivity of gravitational wave (GW) detectors based on laser interferometry is to increase the laser power. However, in such a high-power regime, a nonlinear optomechanical phenomenon called parametric instability (PI) leads to the amplification of the mirrors vibrational modes preventing the detector functioning. ...

Ferrando, Joan Josep Sáez, Juan Antonio

he necessary and sufficient conditions for a unit time-like vector field to be the unit velocity of a classical ideal gas are obtained. In a recent paper [Coll, Ferrando and S\'aez, Phys. Rev D {\bf 99} (2019)] we have offered a purely hydrodynamic description of a classical ideal gas. Here we take one more step in reducing the number of variables ...