### Conveners

#### Discussion: pre-recorded contributed talks

- There are no conveners in this block

#### Discussion: Tabletop scale experiments

- Nancy Aggarwal (Northwestern University)

#### Discussion: on talks of previous day

- There are no conveners in this block

#### Discussion: Theory

- Valerie Domcke (CERN)

#### Discussion: on talks of previous day

- There are no conveners in this block

#### Discussion: Experimental Concepts

- Andreas Ringwald (Deutsches Elektronen-Synchrotron DESY)

#### Discussion: on talks of previous day

- There are no conveners in this block

#### Discussion: UHF GW initiative / living review

- Mike Cruise (University of Birmingham)

### Description

Tabletop detectors

The symmetry breaking of grand unified gauge groups in the early universe often leaves behind relic topological defects such as cosmic strings, domain walls, or monopoles. For some symmetry breaking chains, hybrid defects can form where cosmic strings attach to domain walls or monopoles attach to strings. In general, such hybrid defects are unstable and can leave behind unique gravitational...

Gravitational waves are usually described in terms of a

transverse and traceless (TT) tensor, which allows to introduce the so-called TT coordinates. However, another possible approach is based on the use of a Fermi coordinates system, defined in the vicinity of the world-line of an observer arbitrarily moving in spacetime. In particular, Fermi coordinates have a direct operational meaning,...

We consider primordial gravitational waves induced by large density perturbations generated by inflation in the very early universe. Cosmological alpha-attractors stand out as particularly compelling models to describe inflation, naturally meeting tight observational bounds from cosmic microwave background (CMB) experiments. We investigate alpha-attractor potentials in presence of an...