The Global 21 cm Signal of a Network of Cosmic String Wakes
| Autor: | Hernández, Oscar F. |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stab2634 |
| Popis: | In previous works we discussed the 21 cm signature of a single cosmic string wake. However the 21 cm brightness temperature is influenced by a network of cosmic string wakes, and not one single wake. In this work we consider the signal from a network of wakes laid down during the matter era. We also improve on the previous calculation of a single wake signature. Finally we calculate the enhancement of the global 21 cm brightness temperature due to a network of wakes and discuss its affects of the signal measured in the Wouthuysen-Field absorption trough. We estimated that for string tensions between $10^{-8}$ to $10^{-7}$ there would be between a 10% to a factor 2 enhancement in the signal. Comment: 6 pages, 4 figure. v2 to v3: minor typo corrected in references. v1 to v2: explanation in section 5 expanded, figures enlarged, NANOGrav data description changed in section 2, 1 references added in section 2. Matches the version accepted for publication by MNRAS |
| Databáze: | arXiv |
| Externí odkaz: |
|