# Multi-peaked signatures of primordial gravitational waves from multi-step electroweak phase transition

## TL;DR

This paper explores how multi-step electroweak phase transitions in extended scalar models produce distinctive multi-peaked gravitational wave signatures, potentially detectable by future interferometers.

## Contribution

It demonstrates that multi-peaked GW signatures are generic in multi-scalar extensions of the Standard Model and analyzes their detectability prospects.

## Key findings

- Multi-peaked GW signatures arise from multi-step phase transitions.
- Nested vacuum bubble configurations contribute to multiple GW peaks.
- Detectability of these features by future interferometers is feasible.

## Abstract

The first-order electroweak phase transition in the early universe could occur in multiple steps leading to specific multi-peaked signatures in the primordial gravitational wave (GW) spectrum. We argue that these signatures are generic phenomena in multi-scalar extensions of the Standard Model. In a simple example of such an extension, we have studied the emergence of reoccurring and nested vacuum bubble configurations and their role in the formation of multiple peaks in the GW spectrum. The conditions for potential detectability of these features by the forthcoming generation of interferometers have been studied.