2012/03/31 by Oscar F. Hernandez, Oscar F Hernández, Robert H. Brandenberger +1
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Background radiation #Brightness #COSMIC cancer database #Cosmic ray #Cosmic string #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Noise (video) #Shock (circulatory) #Signature (topology) #String (physics) #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2012/07/032
10 pages, 4 figures, Appendix added, version published in JCAP
openalex publication_date 2012/07/17 · arxiv created 2012/07/31 · arxiv updated 2015/06/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
The analysis of the 21 cm signature of cosmic string wakes is extended in several ways. First we consider the constraints on G μ from the absorption signal of shock heated wakes laid down much later than matter radiation equality. Secondly we analyze the signal of diffuse wake, that is those wakes in which there is a baryon overdensity but which have not shock heated. Finally we compare the size of these signals to the expected thermal noise per pixel which dominates over the background cosmic gas brightness temperature and find that the cosmic string signal will exceed the thermal noise of an individual pixel in the Square Kilometre Array for string tensions G μ > 2.5 × 10 −8 .