# Can decaying particle explain cosmic infrared background excess?

## TL;DR

This paper investigates whether decaying particles can explain the cosmic infrared background excess, finding they can fit the spectrum but conflict with anisotropy measurements, challenging this explanation.

## Contribution

It proposes a decaying particle model to account for the CIB excess and evaluates its consistency with anisotropy data, highlighting limitations of this approach.

## Key findings

- Decaying particles can fit the CIB spectrum.
- The model predicts excessive anisotropy.
- Current anisotropy measurements contradict the model.

## Abstract

Recently the CIBER experiment measured the diffuse cosmic infrared background (CIB) flux and claimed an excess compared with integrated emission from galaxies. We show that the CIB spectrum can be fitted by the additional photons produced by the decay of a new particle. However, it also contributes too much to the anisotropy of the CIB, which is in contradiction with the anisotropy measurements by the CIBER and Hubble Space Telescope.