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On rips and cosmological singularities in a universe merging with baby universes

Published 24 Jan 2024 in gr-qc, astro-ph.CO, and hep-th | (2401.13251v2)

Abstract: Understanding the late-time acceleration of the universe and its subtleties is one of the biggest mysteries in cosmology. A lot of different approaches have been put forward to deal with this, ranging from the conventional cosmological constant to various models of dark energy and beyond. Recently one very interesting approach to explaining the late time acceleration has been put forward, where the the expansion of the universe is driven by mergers with other "baby" universes and has been shown to be quite viable as well from the point of view of recent observational data. So in this work we examine the possibility of various rip scenarios and other future cosmological singularities in such "multiversal" scenario, probing such singularities for the first time in a multi universe scenario. We examine two models of such a baby universe merging cosmology, and show that remarkably no rip scenario or future cosmological singularity is possible in such models.

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  1. Adam G. Riess et al. Observational evidence from supernovae for an accelerating universe and a cosmological constant. Astron. J., 116:1009–1038, 1998.
  2. Steven Weinberg. The Cosmological Constant Problem. Rev. Mod. Phys., 61:1–23, 1989.
  3. Lucas Lombriser. On the cosmological constant problem. Phys. Lett. B, 797:134804, 2019.
  4. T. Padmanabhan. Cosmological constant: The Weight of the vacuum. Phys. Rept., 380:235–320, 2003.
  5. Extended Theories of Gravity. Phys. Rept., 509:167–321, 2011.
  6. Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models. Phys. Rept., 505:59–144, 2011.
  7. Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution. Phys. Rept., 692:1–104, 2017.
  8. Quintessence, cosmic coincidence, and the cosmological constant. Phys. Rev. Lett., 82:896–899, 1999.
  9. Shinji Tsujikawa. Quintessence: A Review. Class. Quant. Grav., 30:214003, 2013.
  10. Valerio Faraoni. Inflation and quintessence with nonminimal coupling. Phys. Rev. D, 62:023504, 2000.
  11. Quintessence as a runaway dilaton. Phys. Rev. D, 65:023508, 2002.
  12. Quintessence without scalar fields. Recent Res. Dev. Astron. Astrophys., 1:625, 2003.
  13. Salvatore Capozziello. Curvature quintessence. Int. J. Mod. Phys. D, 11:483–492, 2002.
  14. Recent Advances on Inflation. Symmetry, 15:9, 2023.
  15. Brane world models of dark energy. JCAP, 11:014, 2003.
  16. M. Sami and V. Sahni. Quintessential inflation on the brane and the relic gravity wave background. Phys. Rev. D, 70:083513, 2004.
  17. Quantum effects, soft singularities and the fate of the universe in a braneworld cosmology. Class. Quant. Grav., 23:3259–3274, 2006.
  18. Dynamics of interacting dark energy model in Einstein and Loop Quantum Cosmology. Phys. Rev. D, 78:123503, 2008.
  19. Dynamics of interacting phantom scalar field dark energy in Loop Quantum Cosmology. Phys. Rev. D, 78:063001, 2008.
  20. A. Bonanno and M. Reuter. Cosmology with selfadjusting vacuum energy density from a renormalization group fixed point. Phys. Lett. B, 527:9–17, 2002.
  21. A. Bonanno and M. Reuter. Cosmology of the Planck era from a renormalization group for quantum gravity. Phys. Rev. D, 65:043508, 2002.
  22. Confronting the IR fixed point cosmology with high redshift supernova data. JCAP, 01:001, 2004.
  23. M. Reuter and Frank Saueressig. From big bang to asymptotic de Sitter: Complete cosmologies in a quantum gravity framework. JCAP, 09:012, 2005.
  24. Entropy signature of the running cosmological constant. JCAP, 08:024, 2007.
  25. Steven Weinberg. Asymptotically Safe Inflation. Phys. Rev. D, 81:083535, 2010.
  26. Planck 2018 results. VI. Cosmological parameters. Astron. Astrophys., 641:A6, 2020. [Erratum: Astron.Astrophys. 652, C4 (2021)].
  27. Large magellanic cloud cepheid standards provide a 1% foundation for the determination of the hubble constant and stronger evidence for physics beyond λ𝜆\lambdaitalic_λcdm. The Astrophysical Journal, 876(1):85, 2019.
  28. A comprehensive measurement of the local value of the hubble constant with 1 km/s/mpc uncertainty from the hubble space telescope and the sh0es team. arXiv preprint arXiv:2112.04510, 2021.
  29. In the realm of the Hubble tension—a review of solutions. Class. Quant. Grav., 38(15):153001, 2021.
  30. Herbert W. Hamber. Quantum Gravity on the Lattice. Gen. Rel. Grav., 41:817–876, 2009.
  31. Jan Ambjorn and R. Loll. Nonperturbative Lorentzian quantum gravity, causality and topology change. Nucl. Phys. B, 536:407–434, 1998.
  32. A Nonperturbative Lorentzian path integral for gravity. Phys. Rev. Lett., 85:924–927, 2000.
  33. Dynamically triangulating Lorentzian quantum gravity. Nucl. Phys. B, 610:347–382, 2001.
  34. Emergence of a 4-D world from causal quantum gravity. Phys. Rev. Lett., 93:131301, 2004.
  35. Semiclassical universe from first principles. Phys. Lett. B, 607:205–213, 2005.
  36. Spectral dimension of the universe. Phys. Rev. Lett., 95:171301, 2005.
  37. Reconstructing the universe. Phys. Rev. D, 72:064014, 2005.
  38. J. Ambjorn and Y. Watabiki. Easing the Hubble constant tension. Mod. Phys. Lett. A, 37(07):2250041, 2022.
  39. The large scale structure of the Universe from a modified Friedmann equation. 8 2022.
  40. Stephen W Hawking. Baby universes ii. Mod. Phys. Lett. A, 5:453, 1990.
  41. Stephen William Hawking and R Laflamme. Baby universes and the non-renormalizability of gravity. Physics Letters B, 209(1):39–41, 1988.
  42. Andrew Strominger. Baby universes. Quantum cosmology and baby universes, 7:272–339, 1991.
  43. Baby universes in string theory. Physical Review D, 73(6):066002, 2006.
  44. Matt Visser. Wormholes, baby universes, and causality. Physical Review D, 41(4):1116, 1990.
  45. Euclidean wormholes, baby universes, and their impact on particle physics and cosmology. Frontiers in Astronomy and Space Sciences, 5:35, 2018.
  46. Spin structures and baby universes. Journal of High Energy Physics, 2020(9):1–31, 2020.
  47. The page curve and baby universes. International Journal of Modern Physics D, 30(14):2142027, 2021.
  48. Transcending the ensemble: baby universes, spacetime wormholes, and the order and disorder of black hole information. Journal of High Energy Physics, 2020(8):1–72, 2020.
  49. Baby universe, third quantization and the cosmological constant. Nuclear Physics B, 321(2):481–508, 1989.
  50. Baby universes in 2d and 4d theories of quantum gravity. Journal of High Energy Physics, 2022(12):1–23, 2022.
  51. Birth of baby universes from gravitational collapse in a modified-gravity scenario. Journal of Cosmology and Astroparticle Physics, 2023(06):028, 2023.
  52. Is the present acceleration of the Universe caused by merging with other universes? JCAP, 12:011, 2023.
  53. Quantum escape of sudden future singularity. Phys. Lett. B, 595:1–8, 2004.
  54. Inhomogeneous equation of state of the universe: Phantom era, future singularity and crossing the phantom barrier. Phys. Rev. D, 72:023003, 2005.
  55. Properties of singularities in (phantom) dark energy universe. Phys. Rev. D, 71:063004, 2005.
  56. The Universe future in modified gravity theories: Approaching the finite-time future singularity. JCAP, 10:045, 2008.
  57. On finite time singularities in scalar field dark energy models based in the rs-ii braneworld. arXiv preprint arXiv:2201.01015, 2022.
  58. Type v singularities in non-standard cosmological backgrounds. Physics of the Dark Universe, 36:101041, 2022.
  59. SD Odintsov and VK Oikonomou. Singular inflationary universe from f (r) gravity. Physical Review D, 92(12):124024, 2015.
  60. SD Odintsov and VK Oikonomou. Singular f (r) cosmology unifying early-and late-time acceleration with matter and radiation domination era. Classical and Quantum Gravity, 33(12):125029, 2016.
  61. VK Oikonomou. Singular bouncing cosmology from gauss-bonnet modified gravity. Physical Review D, 92(12):124027, 2015.
  62. Singular inflation from generalized equation of state fluids. Physics Letters B, 747:310–320, 2015.
  63. Did the universe experience a pressure non-crushing type cosmological singularity in the recent past? Europhysics Letters, 137(3):39001, 2022.
  64. Little Rip, Pseudo Rip and bounce cosmology with generalized equation of state in non-standard backgrounds. 9 2023.
  65. Cosmological singularities in f⁢(T,ϕ)𝑓𝑇italic-ϕf(T,\phi)italic_f ( italic_T , italic_ϕ ) gravity. Eur. Phys. J. C, 83(11):1017, 2023.
  66. Cosmological singularities in non-canonical models of dark energy. Phys. Dark Univ., 42:101366, 2023.
  67. Oem Trivedi. Recent advances in cosmological singularities. 9 2023.
  68. Finite-time cosmological singularities and the possible fate of the Universe. Phys. Rept., 1034:1–114, 2023.
  69. Classifying and avoiding singularities in the alternative gravity dark energy models. Physical Review D, 79(12):124007, 2009.
  70. Phantom energy and cosmic doomsday. Phys. Rev. Lett., 91:071301, 2003.
  71. John D. Barrow. Sudden future singularities. Class. Quant. Grav., 21:L79–L82, 2004.
  72. Quiescent cosmological singularities. Commun. Math. Phys., 218:479–511, 2001.
  73. Tachyons, scalar fields and cosmology. Phys. Rev. D, 69:123512, 2004.
  74. Worse than a big rip? Physics Letters B, 659(1-2):1–5, 2008.
  75. The Final state and thermodynamics of dark energy universe. Phys. Rev. D, 70:103522, 2004.
  76. The Little Rip. Phys. Rev. D, 84:063003, 2011.
  77. Pseudo-rip: Cosmological models intermediate between the cosmological constant and the little rip. Phys. Rev. D, 85:083001, 2012.
  78. The little sibling of the big rip singularity. Int. J. Mod. Phys. D, 24(10):1550078, 2015.

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