# Electroweak Symmetric Dark Matter Balls

## TL;DR

This paper proposes a new type of macroscopic dark matter candidate called electroweak symmetric dark matter balls, which are non-topological solitons formed in the early universe with potential detectability in large-scale experiments.

## Contribution

It introduces the concept of electroweak symmetric dark matter balls as a novel macroscopic dark matter candidate arising from a Higgs-portal model with a conserved dark matter number.

## Key findings

- Existence of non-topological soliton states with electroweak symmetric interiors.
- Potential for detection in large-scale neutrino and dark matter experiments.
- Mass of these objects can be around 1 gram or more.

## Abstract

In the simple Higgs-portal dark matter model with a conserved dark matter number, we show that there exists a non-topological soliton state of dark matter. This state has smaller energy per dark matter number than a free particle state and has its interior in the electroweak symmetric vacuum. It could be produced in the early universe from first-order electroweak phase transition and contribute most of dark matter. This electroweak symmetric dark matter ball is a novel macroscopic dark matter candidate with an energy density of the electroweak scale and a mass of 1 gram or above. Because of its electroweak-symmetric interior, the dark matter ball has a large geometric scattering cross section off a nucleon or a nucleus. Dark matter and neutrino experiments with a large-size detector like Xenon1T, BOREXINO and JUNO have great potential to discover electroweak symmetric dark matter balls. We also discuss the formation of bound states of a dark matter ball and ordinary matter.