# The 4th Conference of the Polish Society on Relativity

Sep 24 – 28, 2017
Kazimierz Dolny, Poland
Europe/Warsaw timezone

## Axial gravitational waves in FLRW cosmology and memory effect

Sep 26, 2017, 11:00 AM
20m
Kazimierz Dolny, Poland

#### Kazimierz Dolny, Poland

Dom Pracy Twórczej SDP ul. Małachowskiego 17 24-120 Kazimierz Dolny
Oral presentation (preferred)

Edward Malec

### Description

We show exemplary initial metrics for gravitational axial waves, that are twice differentiable but which are not $C^2$. They generate wave pulses that interact with matter in the radiation cosmological era. This forces the radiation matter to rotate. This rotation is permanent - it persists after the passage of the gravitational pulse. In contrast to that, we explicitly show that a class of smooth initial metrics that are at least $C^2$ gives rise to gravitational wave pulses that do not interact with the background during the radiation epoch.

### Primary authors

Wojciech Kulczycki (Jagiellonian University) Edward Malec