References
1. P. Montero-Camacho, X. Fang, G. Vasquez, M. Silva, and C. M. Hirata, “Revisiting constraints on asteroid-mass primordial black holes as dark matter candidates,” JCAP 08, 031 (2019). CrossRef Google Scholar
2. S. Weinberg, “Theories of the cosmological constant,” arXiv:astro-ph/9610044 [astro-ph]. CrossRef Google Scholar
3. N. Aghanim et al. [Planck], “Planck 2018 results. VI. Cosmological parameters,” Astron. Astrophys. 641, A6 (2020). CrossRef Google Scholar
4. For a review of topological defects, see A. Vilenkin and E. P. S. Shellard, Cosmic Strings and Other Topological Defects (Cambridge University Press, Cambridge, 2000). Google Scholar
5. J. J. Blanco-Pillado, K. D. Olum, and J. M. Wachter, Comparison of cosmic string and superstring models to NANOGrav 12.5-year results, Phys. Rev. D 103, 103512 (2021). CrossRef Google Scholar
6. P. A. R. Ade et al. [BICEP and Keck], “Improved constraints on primordial gravitational waves using Planck, WMAP, and BICEP/keck observations through the 2018 observing season,” Phys. Rev. Lett. 127, 151301 (2021). CrossRef Google Scholar
7. L. Verde, T. Treu, and A. G. Riess, “Tensions between the early and the late universe,” Nature Astron. 3, 891 (2019). CrossRef Google Scholar
8. D. J. Schwarz, C. J. Copi, D. Huterer, and G. D. Starkman, “CMB anomalies after Planck,” Class.: Quant. Grav. 33, 184001 (2016). CrossRef Google Scholar
9. A. Linde, “A brief history of the multiverse, rept,” Prog. Phys. 80, 022001 (2017). CrossRef Google Scholar
10. R. Gobbetti and M. Kleban, “Analyzing cosmic bubble collisions,” JCAP 05, 025 (2012). CrossRef Google Scholar
11. H. Deng and A. Vilenkin, “Primordial black hole formation by vacuum bubbles,” JCAP 12, 044 (2017). CrossRef Google Scholar
12. B. Freivogel, “Making predictions in the multiverse,” Class.: Quant. Grav. 28, 204007 (2011). CrossRef Google Scholar
13. M. Tegmark, A. Aguirre, M. Rees, and F. Wilczek, Dimensionless constants, cosmology and other dark matters, Phys. Rev. D 73, 023505 (2006). CrossRef Google Scholar
14. L. Pogosian, A. Vilenkin, and M. Tegmark, “Anthropic predictions for vacuum energy and neutrino masses,” JCAP 07, 005 (2004). CrossRef Google Scholar
15. A. Borde, A. H. Guth, and A. Vilenkin, “Inflationary space-times are incompletein past directions,” Phys. Rev. Lett. 90, 151301 (2003). CrossRef Google Scholar
16. A. Vilenkin, “The quantum cosmology debate,” AIP Conf. Proc. 478, 23 (1999). CrossRef Google Scholar