Abstract
Time-like linear dilaton triggers, at the classical level, the creation of closed folded strings at an instant. We show that in cosmology these instant folded strings induce negative pressure at no energy cost. Hence they seem to allow an era in which the energy density increases (decreases) while the universe is expanding (contracting). This and other aspects of instant folded strings suggest that they might shed new light on the origin of the arrow of time.
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WMAP collaboration, Wilkinson Microwave Anisotropy Probe (WMAP) three year results: implications for cosmology, Astrophys. J. Suppl. 170 (2007) 377 [astro-ph/0603449] [INSPIRE].
Planck collaboration, Planck 2018 results. X. Constraints on inflation, Astron. Astrophys. 641 (2020) A10 [arXiv:1807.06211] [INSPIRE].
A.H. Guth, The inflationary universe: a possible solution to the horizon and flatness problems, Phys. Rev. D 23 (1981) 347.
D. Harlow, S.H. Shenker, D. Stanford and L. Susskind, Tree-like structure of eternal inflation: A solvable model, Phys. Rev. D 85 (2012) 063516 [arXiv:1110.0496] [INSPIRE].
S.M. Carroll, In what sense is the early universe fine-tuned?, arXiv:1406.3057 [INSPIRE].
L. Dyson, M. Kleban and L. Susskind, Disturbing implications of a cosmological constant, JHEP 10 (2002) 011 [hep-th/0208013] [INSPIRE].
P.J. Steinhardt and N. Turok, Why the cosmological constant is small and positive, Science 312 (2006) 1180 [astro-ph/0605173] [INSPIRE].
R. Bousso, Vacuum structure and the arrow of Time, Phys. Rev. D 86 (2012) 123509 [arXiv:1112.3341] [INSPIRE].
V.A. Rubakov, The null energy condition and its violation, Phys. Usp. 57 (2014) 128 [Usp. Fiz. Nauk 184 (2014) 137] [arXiv:1401.4024] [INSPIRE].
A. Adams, J. Polchinski and E. Silverstein, Don’t panic! Closed string tachyons in ALE space-times, JHEP 10 (2001) 029 [hep-th/0108075] [INSPIRE].
A. Sagnotti, Open strings and their symmetry groups, hep-th/0208020 [INSPIRE].
P. Hořava, Strings on world sheet orbifolds, Nucl. Phys. B 327 (1989) 461 [INSPIRE].
E.G. Gimon and J. Polchinski, Consistency conditions for orientifolds and d manifolds, Phys. Rev. D 54 (1996) 1667 [hep-th/9601038] [INSPIRE].
N. Itzhaki, Stringy instability inside the black hole, JHEP 10 (2018) 145 [arXiv:1808.02259] [INSPIRE].
K. Attali and N. Itzhaki, The averaged null energy condition and the black hole interior in string theory, Nucl. Phys. B 943 (2019) 114631 [arXiv:1811.12117] [INSPIRE].
S. Hellerman and I. Swanson, Cosmological solutions of supercritical string theory, Phys. Rev. D 77 (2008) 126011 [hep-th/0611317] [INSPIRE].
O. Aharony and E. Silverstein, Supercritical stability, transitions and (pseudo)tachyons, Phys. Rev. D 75 (2007) 046003 [hep-th/0612031] [INSPIRE].
J.M. Maldacena, Long strings in two dimensional string theory and non-singlets in the matrix model, JHEP 09 (2005) 078 [Int. J. Geom. Meth. Mod. Phys. 3 (2006) 1] [hep-th/0503112] [INSPIRE].
A. Giveon, N. Itzhaki and U. Peleg, Instant folded strings and black fivebranes, JHEP 08 (2020) 020 [arXiv:2004.06143] [INSPIRE].
M. Gasperini and G. Veneziano, Pre-big bang in string cosmology, Astropart. Phys. 1 (1993) 317 [hep-th/9211021] [INSPIRE].
R. Brustein and G. Veneziano, The graceful exit problem in string cosmology, Phys. Lett. B 329 (1994) 429 [hep-th/9403060] [INSPIRE].
J. Khoury, B.A. Ovrut, P.J. Steinhardt and N. Turok, The ekpyrotic universe: colliding branes and the origin of the hot big bang, Phys. Rev. D 64 (2001) 123522 [hep-th/0103239] [INSPIRE].
J. Khoury, B.A. Ovrut, N. Seiberg, P.J. Steinhardt and N. Turok, From big crunch to big bang, Phys. Rev. D 65 (2002) 086007 [hep-th/0108187] [INSPIRE].
E. Farhi and A.H. Guth, An obstacle to creating a universe in the laboratory, Phys. Lett. B 183 (1987) 149 [INSPIRE].
R. Penrose, Gravitational collapse and space-time singularities, Phys. Rev. Lett. 14 (1965) 57 [INSPIRE].
S.D. Mathur, The VECRO hypothesis, arXiv:2001.11057 [INSPIRE].
R.H. Brandenberger and C. Vafa, Superstrings in the early universe, Nucl. Phys. B 316 (1989) 391 [INSPIRE].
A.A. Tseytlin and C. Vafa, Elements of string cosmology, Nucl. Phys. B 372 (1992) 443 [hep-th/9109048] [INSPIRE].
A. Giveon and N. Itzhaki, Stringy black hole interiors, JHEP 11 (2019) 014 [arXiv:1908.05000] [INSPIRE].
A. Giveon and N. Itzhaki, Stringy information and black holes, JHEP 06 (2020) 117 [arXiv:1912.06538] [INSPIRE].
C. Kounnas, H. Partouche and N. Toumbas, S-brane to thermal non-singular string cosmology, Class. Quant. Grav. 29 (2012) 095014 [arXiv:1111.5816] [INSPIRE].
R.H. Brandenberger, C. Kounnas, H. Partouche, S.P. Patil and N. Toumbas, Cosmological perturbations across an S-brane, JCAP 03 (2014) 015 [arXiv:1312.2524] [INSPIRE].
R. Brandenberger, K. Dasgupta and Z. Wang, Reheating after S-brane ekpyrosis, Phys. Rev. D 102 (2020) 063514 [arXiv:2007.01203] [INSPIRE].
M. Gutperle and A. Strominger, Space-like branes, JHEP 04 (2002) 018 [hep-th/0202210] [INSPIRE].
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Itzhaki, N. String theory and the arrow of time. J. High Energ. Phys. 2021, 192 (2021). https://doi.org/10.1007/JHEP03(2021)192
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DOI: https://doi.org/10.1007/JHEP03(2021)192