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Observable non-Gaussianity from gauge field production in slow roll inflation, and a challenging connection with magnetogenesis

Neil Barnaby, Ryo Namba, and Marco Peloso

  • School of Physics and Astronomy, University of Minnesota, Minneapolis, 55455 (USA)

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Phys. Rev. D 85, 123523 – Published 14 June, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.123523

Abstract

In any realistic particle physics model of inflation, the inflaton can be expected to couple to other fields. We consider a model with a dilatonlike coupling between a U(1) gauge field and a scalar inflaton. We show that this coupling can result in observable non-Gaussianity, even in the conventional regime where inflation is supported by a single scalar slowly rolling on a smooth potential: the time-dependent inflaton condensate leads to amplification of the large-scale gauge field fluctuations, which can feed back into the scalar/tensor cosmological perturbations. In the squeezed limit, the resulting bispectrum is close to the local one, but it shows a sizable and characteristic quadrupolar dependence on the angle between the shorter and the larger modes in the correlation. Observable non-Gaussianity is obtained in a regime where perturbation theory is under control. If the gauge field is identified with the electromagnetic field, the model that we study is a realization of the magnetogenesis idea originally proposed by Ratra, and widely studied. This identification (which is not necessary for the non-Gaussianity production) is however problematic in light of a strong coupling problem already noted in the literature.

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References (80)

  1. N. Barnaby, Adv. Astron. 2010, 156180 (2010).
  2. V. Acquaviva, N. Bartolo, S. Matarrese, and A. Riotto, Nucl. Phys. B667, 119 (2003).
  3. J. M. Maldacena, J. High Energy Phys. 05 (2003) 013.
  4. D. Seery and J. E. Lidsey, J. Cosmol. Astropart. Phys. 06 (2005) 003.
  5. D. Seery, K. A. Malik, and D. H. Lyth, J. Cosmol. Astropart. Phys. 03 (2008) 014.
  6. X. Chen, M. x. Huang, S. Kachru, and G. Shiu, J. Cosmol. Astropart. Phys. 01 (2007) 002.
  7. N. Barnaby, T. Biswas, and J. M. Cline, J. High Energy Phys. 04 (2007) 056; N. Barnaby and J. M. Cline, J. Cosmol. Astropart. Phys. 07 (2007) 017; 06 (2008) 030.
  8. P. D. Meerburg, J. P. van der Schaar, and P. S. Corasaniti, J. Cosmol. Astropart. Phys. 05 (2009) 018.
  9. P. D. Meerburg, J. P. van der Schaar, and M. G. Jackson, J. Cosmol. Astropart. Phys. 02 (2010) 001.
  10. R. Holman and A. J. Tolley, J. Cosmol. Astropart. Phys. 05 (2008) 001.
  11. X. Chen, R. Easther, and E. A. Lim, J. Cosmol. Astropart. Phys. 06 (2007) 023.
  12. X. Chen, R. Easther, and E. A. Lim, J. Cosmol. Astropart. Phys. 04 (2008) 010.
  13. N. Barnaby and J. M. Cline, Phys. Rev. D 73, 106012 (2006); 75, 086004 (2007).
  14. J. R. Bond, A. V. Frolov, Z. Huang, and L. Kofman, Phys. Rev. Lett. 103, 071301 (2009).
  15. A. Berera, Phys. Rev. Lett. 75, 3218 (1995).
  16. M. M. Anber and L. Sorbo, Phys. Rev. D 81, 043534 (2010).
  17. N. Barnaby and M. Peloso, Phys. Rev. Lett. 106, 181301 (2011).
  18. N. Barnaby, R. Namba, and M. Peloso, J. Cosmol. Astropart. Phys. 04 (2011) 009.
  19. N. Barnaby, E. Pajer, and M. Peloso, Phys. Rev. D 85, 023525 (2012).
  20. N. Barnaby, Z. Huang, L. Kofman, and D. Pogosyan, Phys. Rev. D 80, 043501 (2009).
  21. N. Barnaby and Z. Huang, Phys. Rev. D 80, 126018 (2009).
  22. N. Barnaby, Phys. Rev. D 82, 106009 (2010).
  23. J. L. Cook and L. Sorbo, Phys. Rev. D 85, 023534 (2012).
  24. L. Sorbo, J. Cosmol. Astropart. Phys. 06 (2011) 003.
  25. S. Ferrara and R. Kallosh, J. High Energy Phys. 12 (2011) 096.
  26. A. Lewis, J. Cosmol. Astropart. Phys. 10 (2011) 026.
  27. N. Barnaby and S. Shandera, J. Cosmol. Astropart. Phys. 01 (2012) 034.
  28. D. H. Lyth and D. Wands, Phys. Lett. B 524, 5 (2002).
  29. N. Bartolo, S. Matarrese, and A. Riotto, Phys. Rev. D 69, 043503 (2004).
  30. K. Dimopoulos, Phys. Rev. D 74, 083502 (2006); A. Golovnev, V. Mukhanov, and V. Vanchurin, J. Cosmol. Astropart. Phys. 06 (2008) 009; K. Dimopoulos, arXiv:0806.4680; K. Dimopoulos, M. Karciauskas, D. H. Lyth, and Y. Rodriguez, J. Cosmol. Astropart. Phys. 05 (2009) 013; M. Karciauskas, K. Dimopoulos, and D. H. Lyth, Phys. Rev. D 80, 023509 (2009); N. Bartolo, E. Dimastrogiovanni, S. Matarrese, and A. Riotto, J. Cosmol. Astropart. Phys. 10 (2009) 015; K. Dimopoulos, M. Karciauskas, and J. M. Wagstaff, Phys. Rev. D 81, 023522 (2010); Phys. Lett. B 683, 298 (2010); N. Bartolo, E. Dimastrogiovanni, S. Matarrese, and A. Riotto, J. Cosmol. Astropart. Phys. 11 (2009) 028; J. M. Wagstaff and K. Dimopoulos, Phys. Rev. D 83, 023523 (2011); A. Maleknejad and M. M. Sheikh-Jabbari, arXiv:1102.1513; M. Karciauskas, J. Cosmol. Astropart. Phys. 01 (2012) 014; K. Dimopoulos, D. Wills, and I. Zavala, arXiv:1108.4424.
  31. B. Himmetoglu, C. R. Contaldi, and M. Peloso, Phys. Rev. Lett. 102, 111301 (2009).
  32. B. Himmetoglu, C. R. Contaldi, and M. Peloso, Phys. Rev. D 80, 123530 (2009).
  33. J. Soda, Classical Quantum Gravity 29, 083001 (2012).
  34. S. Yokoyama and J. Soda, J. Cosmol. Astropart. Phys. 08 (2008) 005.
  35. A. D. Linde, Phys. Rev. D 49, 748 (1994).
  36. B. Ratra, Astrophys. J. 391, L1 (1992).
  37. M. Gasperini, M. Giovannini, and G. Veneziano, Phys. Rev. Lett. 75, 3796 (1995).
  38. J. Martin and J.’i. Yokoyama, J. Cosmol. Astropart. Phys. 01 (2008) 025.
  39. S. Kanno, J. Soda and M.-a. Watanabe, J. Cosmol. Astropart. Phys. 12 (2009) 009.
  40. K. Subramanian, Astron. Nachr. 331, 110 (2010).
  41. L. M. Widrow, Rev. Mod. Phys. 74, 775 (2002).
  42. K. Bamba and J. Yokoyama, Phys. Rev. D 69, 043507 (2004).
  43. D. Seery, J. Cosmol. Astropart. Phys. 08 (2009) 018.
  44. V. Demozzi, V. Mukhanov, and H. Rubinstein, J. Cosmol. Astropart. Phys. 08 (2009) 025.
  45. R. R. Caldwell, L. Motta, and M. Kamionkowski, Phys. Rev. D 84, 123525 (2011).
  46. M. Giovannini, Int. J. Mod. Phys. D 13, 391 (2004).
  47. D. Grasso and H. R. Rubinstein, Phys. Rep. 348, 163 (2001).
  48. L. M. Widrow, D. Ryu, D. Schleicher, K. Subramanian, C. G. Tsagas, and R. A. Treumann, Space Sci. Rev. 166, 37 (2011).
  49. D. Ryu, D. R. G. Schleicher, R. A. Treumann, C. G. Tsagas, and L. M. Widrow, Space Sci. Rev. 166, 1 (2011).
  50. A. Kandus, K. E. Kunze, and C. G. Tsagas, Phys. Rep. 505, 1 (2011).
  51. I. Brown and R. Crittenden, Phys. Rev. D 72, 063002 (2005); T. R. Seshadri and K. Subramanian, Phys. Rev. Lett. 103, 081303 (2009); C. Caprini, F. Finelli, D. Paoletti, and A. Riotto, J. Cosmol. Astropart. Phys. 06 (2009) 021; R.-G. Cai, B. Hu, and H.-B. Zhang, 08 (2010) 025; M. Shiraishi, D. Nitta, S. Yokoyama, K. Ichiki, and K. Takahashi, Phys. Rev. D 82, 121302 (2010); 83, 029901(E) (2011); P. Trivedi, T. R. Seshadri, and K. Subramanian, arXiv:1111.0744 [Phys. Rev. Lett. (to be published)].
  52. J. R. Shaw and A. Lewis, arXiv:1006.4242; P. Trivedi, K. Subramanian, and T. R. Seshadri, Phys. Rev. D 82, 123006 (2010).
  53. M.-a. Watanabe, S. Kanno, and J. Soda, Phys. Rev. Lett. 102, 191302 (2009).
  54. D. Polarski and A. A. Starobinsky, Classical Quantum Gravity 13, 377 (1996).
  55. M. Giovannini, J. Cosmol. Astropart. Phys. 04 (2010) 003.
  56. D. Baumann et al. (CMBPol Study Team Collaboration), AIP Conf. Proc. 1141, 10 (2009).
  57. M. S. Turner and L. M. Widrow, Phys. Rev. D 37, 2743 (1988).
  58. R. Durrer, L. Hollenstein, and R. K. Jain, J. Cosmol. Astropart. Phys. 03 (2011) 037.
  59. M. M. Anber and L. Sorbo, J. Cosmol. Astropart. Phys. 10 (2006) 018.
  60. C. T. Byrnes, L. Hollenstein, R. K. Jain, and F. R. Urban, J. Cosmol. Astropart. Phys. 03 (2012) 009.
  61. R. H. Cyburt, B. D. Fields, K. A. Olive, and E. Skillman, Astropart. Phys. 23, 313 (2005).
  62. A. Coc, N. J. Nunes, K. A. Olive, J.-P. Uzan, and E. Vangioni, Phys. Rev. D 76, 023511 (2007).
  63. B. Holdom, Phys. Lett. B 166, 196 (1986).
  64. D. Babich, P. Creminelli, and M. Zaldarriaga, J. Cosmol. Astropart. Phys. 08 (2004) 009.
  65. E. Komatsu and D. N. Spergel, Phys. Rev. D 63, 063002 (2001).
  66. E. Komatsu et al. (WMAP Collaboration), Astrophys. J. Suppl. Ser. 192, 18 (2011).
  67. V. F. Mukhanov, Pis’ma Zh. Eksp. Teor. Fiz. 41, 402 (1985) [JETP Lett. 41, 493 (1985)].
  68. M. Sasaki, Prog. Theor. Phys. 76, 1036 (1986).
  69. K. A. Malik, J. Cosmol. Astropart. Phys. 03 (2007) 004.
  70. D. I. Podolsky, G. N. Felder, L. Kofman, and M. Peloso, Phys. Rev. D 73, 023501 (2006).
  71. C. Bonvin, C. Caprini, and R. Durrer, arXiv:1112.3901.
  72. C. Bonvin, C. Caprini, and R. Durrer, arXiv:1112.3897.
  73. M. LoVerde, A. Miller, S. Shandera, and L. Verde, J. Cosmol. Astropart. Phys. 04 (2008) 014.
  74. J. Kumar, L. Leblond, and A. Rajaraman, J. Cosmol. Astropart. Phys. 04 (2010) 024.
  75. S. Shandera, N. Dalal, and D. Huterer, J. Cosmol. Astropart. Phys. 03 (2011) 017.
  76. S. Weinberg, Phys. Rev. D 72, 043514 (2005).
  77. D. Seery, J. Cosmol. Astropart. Phys. 11 (2007) 025.
  78. L. Senatore and M. Zaldarriaga, J. High Energy Phys. 12 (2010) 008.
  79. C. P. Burgess, L. Leblond, R. Holman, and S. Shandera, J. Cosmol. Astropart. Phys. 03 (2010) 033.
  80. K. A. Malik and D. Wands, Phys. Rep. 475, 1 (2009).

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Phys. Rev. D 85, 123523– Published 14 June, 2012
  • Received 14 February 2012
Article part of CHORUS

© 2012 American Physical Society

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