Accretion onto Oscillating Cosmic String Loops

Understand

Cosmic string loops are non-linear density fluctuations which form in the early universe and could play an important role in explaining many phenomena which are in tension with the standard $\Lambda$CDM model.

• Hence, the details of the accretion process onto cosmic string loops should be studied in detail.
• Most previous works view loops as point masses and ignore the impact of a finite loop size.
• In this work, we utilize the Zel'dovich approximation to calculate the non-linear mass sourced by a static extended loop with a time-averaged density profile derived from the trajectory of the loop oscillation, and compare the result with what is obtained for a point-mass source.