Local non-Gaussianity from rapidly varying sound speeds

Journal of Cosmology and Astroparticle Physics

Volumn 2012, Issue 8, 2012, Pages

  Emery, Jon ^a   Tasinato, Gianmassimo ^a   Wands, David ^a  

^a UNIVERSITY OF PORTSMOUTH   (United Kingdom)

Author keywords

cosmological perturbation theory; inflation; physics of the early universe; string theory and cosmology

Indexed keywords

EID: 84865274681     PISSN: None     EISSN: 14757516     Source Type: Journal    
DOI: 10.1088/1475-7516/2012/08/005     Document Type: Article

References (95)

1. D.H. Lyth and A. Riotto, 1999 Particle physics models of inflation and the cosmological density perturbation, Phys. Rept. 314 1 [hep-ph/9807278]
2. D.H. Lyth and A. Liddle, 2009 The primordial density perturbation: cosmology, inflation and the origin of structure, Cambridge University Press, Cambridge U.K.
3. A. Mazumdar and J. Rocher, 2011 Particle physics models of inflation and curvaton scenarios, Phys. Rept. 497 85 [1001.0993]
4. E. Komatsu et al., Non-Gaussianity as a probe of the physics of the primordial universe and the astrophysics of the low redshift universe, [0902.4759]
5. Planck collaboration, The scientific programme of Planck, Report ESA-SCI2005 1, [astro-ph/0604069], also available for direct download from http://www.rssd.esa.int/Planck
6. N. Bartolo, E. Komatsu, S. Matarrese and A. Riotto, 2004 Non-Gaussianity from inflation: theory and observations, Phys. Rept. 402 103 [astro-ph/0406398] (Pubitemid 40397588)
7. X. Chen, 2010 Primordial non-Gaussianities from inflation models, Adv. Astron. 2010 638979 [1002.1416]
8. T. Moroi and T. Takahashi, 2001 Effects of cosmological moduli fields on cosmic microwave background, Phys. Lett. B 522 215 [Erratum ibid B 539 (2002) 303] [hep-ph/0110096] (Pubitemid 33107811)
9. D.H. Lyth and D. Wands, 2002 Generating the curvature perturbation without an inflaton, Phys. Lett. B 524 5 [hep-ph/0110002]
10. D.H. Lyth and D. Wands, 2003 Conserved cosmological perturbations, Phys. Rev. D 68 103515 [astro-ph/0306498] (Pubitemid 44628614)
11. L. Kofman, Probing string theory with modulated cosmological fluctuations, [astro-ph/0303614]
12. G. Dvali, A. Gruzinov and M. Zaldarriaga, 2004 A new mechanism for generating density perturbations from inflation, Phys. Rev. D 69 023505 [astro-ph/0303591] (Pubitemid 44652952)
13. C. Burgess et al., 2010 Non-standard primordial fluctuations and nonGaussianity in string inflation J. High Energy Phys. JHEP08(2010)045 [1005.4840]
14. M. Cicoli, G. Tasinato, I. Zavala, C. Burgess and F. Quevedo, 2012 Modulated reheating and large non-Gaussianity in string cosmology J. Cosmol. Astropart. Phys. JCAP05(2012)039 [1202.4580]
15. C. Gordon, D. Wands, B.A. Bassett and R. Maartens, 2001 Adiabatic and entropy perturbations from inflation, Phys. Rev. D 63 023506 [astro-ph/0009131] (Pubitemid 33795996)
16. S. Groot Nibbelink and B. van Tent, 2002 Scalar perturbations during multiple field slow-roll inflation, Class. Quant. Grav. 19 613 [hep-ph/0107272] (Pubitemid 37035368)
17. G. Rigopoulos, 2004 On second order gauge invariant perturbations in multi-field inflationary models, Class. Quant. Grav. 21 1737 [astro-ph/0212141] (Pubitemid 38544865)
18. D. Wands, K.A. Malik, D.H. Lyth and A.R. Liddle, 2000 A new approach to the evolution of cosmological perturbations on large scales, Phys. Rev. D 62 043527 [astro-ph/0003278]
19. D.H. Lyth, K.A. Malik and M. Sasaki, 2005 A general proof of the conservation of the curvature perturbation J. Cosmol. Astropart. Phys. JCAP05(2005)004 [astro-ph/0411220]
20. F. Bernardeau and J.-P. Uzan, 2002 Non-Gaussianity in multifield inflation, Phys. Rev. D 66 103506 [hep-ph/0207295] (Pubitemid 44659474)
21. F. Vernizzi and D. Wands, 2006 Non-Gaussianities in two-field inflation J. Cosmol. Astropart. Phys. JCAP05(2006)019 [astro-ph/0603799]
22. G. Rigopoulos, E. Shellard and B. van Tent, 2006 Large non-Gaussianity in multiple-field inflation, Phys. Rev. D 73 083522 [astro-ph/0506704]
23. G. Rigopoulos, E. Shellard and B. van Tent, 2007 Quantitative bispectra from multifield inflation, Phys. Rev. D 76 083512 [astro-ph/0511041]
24. S. Yokoyama, T. Suyama and T. Tanaka, 2007 Primordial non-Gaussianity in multi-scalar slow-roll inflation J. Cosmol. Astropart. Phys. JCAP07(2007)013 [0705.3178]
25. T. Battefeld and R. Easther, 2007 Non-Gaussianities in multi-field inflation J. Cosmol. Astropart. Phys. JCAP03(2007)020 [astro-ph/0610296]
26. S. Yokoyama, T. Suyama and T. Tanaka, 2008 Primordial non-Gaussianity in multi-scalar inflation, Phys. Rev. D 77 083511 [0711.2920]
27. C.T. Byrnes, K.-Y. Choi and L.M. Hall, 2008 Conditions for large non-Gaussianity in two-field slow-roll inflation J. Cosmol. Astropart. Phys. JCAP10(2008)008 [0807.1101]
28. M. Sasaki, 2008 Multi-brid inflation and non-Gaussianity, Prog. Theor. Phys. 120 159 [0805.0974]
29. C.T. Byrnes and G. Tasinato, 2009 Non-Gaussianity beyond slow roll in multi-field inflation J. Cosmol. Astropart. Phys. JCAP08(2009)016 [0906.0767]
30. D. Battefeld and T. Battefeld, 2009 On non-Gaussianities in multi-field inflation (N fields): bi and tri-spectra beyond slow-roll J. Cosmol. Astropart. Phys. JCAP11(2009)010 [0908.4269]
31. T. Wang, 2010 Note on non-Gaussianities in two-field inflation, Phys. Rev. D 82 123515 [1008.3198]
32. E. Tzavara and B. van Tent, 2011 Bispectra from two-field inflation using the long-wavelength formalism J. Cosmol. Astropart. Phys. JCAP06(2011)026 [1012.6027]
33. J. Elliston, D. Mulryne, D. Seery and R. Tavakol, 2011 Evolution of non-Gaussianity in multi-scalar field models, Int. J. Mod. Phys. A 26 3821 [1107.2270]
34. NL to the adiabatic limit J. Cosmol. Astropart. Phys. JCAP11(2011)005 [1106.2153]
35. nl, Phys. Rev. D 83 103517 [1011.4934]
36. J. Meyers and N. Sivanandam, 2011 Adiabaticity and the fate of non-Gaussianities: the trispectrum and beyond, Phys. Rev. D 84 063522 [1104.5238]
37. C.M. Peterson and M. Tegmark, 2011 Non-Gaussianity in two-field inflation, Phys. Rev. D 84 023520 [1011.6675]
38. Y. Watanabe, 2012 Nversus covariant perturbative approach to non-Gaussianity outside the horizon in multifield inflation, Phys. Rev. D 85 103505 [1110.2462]
39. K.-Y. Choi, S.A. Kim and B. Kyae, 2012 Primordial curvature perturbation during and at the end of multi-field inflation, Nucl. Phys. B 861 271 [1202.0089]
40. A. Mazumdar and L. Wang, Separable and non-separable multi-field inflation and large non-Gaussianity, [1203.3558]
41. J. Frazer and A.R. Liddle, 2012 Multi-field inflation with random potentials: field dimension, feature scale and non-Gaussianity J. Cosmol. Astropart. Phys. JCAP02(2012)039 [1111.6646]
42. D. Battefeld, T. Battefeld and S. Schulz, 2012 On the unlikeliness of multi-field inflation: bounded random potentials and our vacuum J. Cosmol. Astropart. Phys. JCAP06(2012)034 [1203.3941]
43. D. Salopek and J. Bond, 1990 Nonlinear evolution of long wavelength metric fluctuations in inflationary models, Phys. Rev. D 42 3936
44. W.H. Kinney, 1997 A Hamilton-Jacobi approach to nonslow roll inflation, Phys. Rev. D 56 2002 [hep-ph/9702427]
45. X. Chen, M.-x. Huang, S. Kachru and G. Shiu, 2007 Observational signatures and non-Gaussianities of general single field inflation J. Cosmol. Astropart. Phys. JCAP01(2007)002 [hep-th/0605045]
46. K. Koyama, 2010 Non-Gaussianity of quantum fields during inflation, Class. Quant. Grav. 27 124001 [1002.0600]
47. A.J. Christopherson and K.A. Malik, 2009 The non-adiabatic pressure in general scalar field systems, Phys. Lett. B 675 159 [0809.3518]
48. E. Silverstein and D. Tong, 2004 Scalar speed limits and cosmology: acceleration from D-cceleration, Phys. Rev. D 70 103505 [hep-th/0310221]
49. M. Alishahiha, E. Silverstein and D. Tong, 2004 DBI in the sky, Phys. Rev. D 70 123505 [hep-th/0404084]
50. D. Langlois, S. Renaux-Petel, D.A. Steer and T. Tanaka, 2008 Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation, Phys. Rev. D 78 063523 [0806.0336]
51. D. Langlois, S. Renaux-Petel, D.A. Steer and T. Tanaka, 2008 Primordial fluctuations and non-Gaussianities in multi-field DBI inflation, Phys. Rev. Lett. 101 061301 [0804.3139]
52. F. Arroja, S. Mizuno and K. Koyama, 2008 Non-Gaussianity from the bispectrum in general multiple field inflation J. Cosmol. Astropart. Phys. JCAP08(2008)015 [0806.0619]
53. S. Renaux-Petel and G. Tasinato, 2009 Nonlinear perturbations of cosmological scalar fields with non-standard kinetic terms J. Cosmol. Astropart. Phys. JCAP01(2009)012 [0810.2405]
54. X. Gao and B. Hu, 2009 Primordial trispectrum from entropy perturbations in multifield DBI model J. Cosmol. Astropart. Phys. JCAP08(2009)012 [0903.1920]
55. S. Mizuno, F. Arroja, K. Koyama and T. Tanaka, 2009 Lorentz boost and non-Gaussianity in multi-field DBI-inflation, Phys. Rev. D 80 023530 [0905.4557]
56. D. Langlois, S. Renaux-Petel and D.A. Steer, 2009 Multi-field DBI inflation: introducing bulk forms and revisiting the gravitational wave constraints J. Cosmol. Astropart. Phys. JCAP04(2009)021 [0902.2941]
57. X. Gao, M. Li and C. Lin, 2009 Primordial non-Gaussianities from the trispectra in multiple field inflationary models J. Cosmol. Astropart. Phys. JCAP11(2009)007 [0906.1345]
58. Y.-F. Cai and W. Xue, 2009 N-flation from multiple DBI type actions, Phys. Lett. B 680 395 [0809.4134]
59. Y.-F. Cai and H.-Y. Xia, 2009 Inflation with multiple sound speeds: a model of multiple DBI type actions and non-Gaussianities, Phys. Lett. B 677 226 [0904.0062]
60. S. Pi and D. Wang, 2012 Cosmological perturbations in inflation with multiple sound speeds, Nucl. Phys. B 862 409 [1107.0813]
61. S. Renaux-Petel, 2009 Combined local and equilateral non-Gaussianities from multifield DBI inflation J. Cosmol. Astropart. Phys. JCAP10(2009)012 [0907.2476]
62. M. Dias, J. Frazer and A.R. Liddle, Multifield consequences for D-brane inflation, [1203.3792]
63. N. Khosravi, 2012 Effective field theory of multi-field inflation a la Weinberg J. Cosmol. Astropart. Phys. JCAP05(2012)018 [1203.2266]
64. J. Khoury and F. Piazza, 2009 Rapidly-varying speed of sound, scale invariance and non-Gaussian signatures J. Cosmol. Astropart. Phys. JCAP07(2009)026 [0811.3633]
65. J. Noller and J. Magueijo, 2011 Non-Gaussianity in single field models without slow-roll, Phys. Rev. D 83 103511 [1102.0275]
66. M. Nakashima, R. Saito, Y.-i. Takamizu and J. Yokoyama, 2011 The effect of varying sound velocity on primordial curvature perturbations, Prog. Theor. Phys. 125 1035 [1009.4394]
67. R.H. Ribeiro, 2012 Inflationary signatures of single-field models beyond slow-roll J. Cosmol. Astropart. Phys. JCAP05(2012)037 [1202.4453]
68. M. Park and L. Sorbo, 2012 Sudden variations in the speed of sound during inflation: features in the power spectrum and bispectrum, Phys. Rev. D 85 083520 [1201.2903]
69. R.L. Arnowitt, S. Deser and C.W. Misner, The dynamics of general relativity, [gr-qc/0405109]
70. D.A. Easson, R. Gregory, D.F. Mota, G. Tasinato and I. Zavala, 2008 Spinflation J. Cosmol. Astropart. Phys. JCAP02(2008)010 [0709.2666]
71. K.A. Malik, 2001 Cosmological perturbations in an inflationary universe, Ph.D. Thesis, University of Portsmouth, Portsmouth U.K. [astro-ph/0101563]
72. K.A. Malik and D. Wands, 2009 Cosmological perturbations, Phys. Rept. 475 1 [0809.4944]
73. D. Wands, 2010 Local non-Gaussianity from inflation, Class. Quant. Grav. 27 124002 [1004.0818]
74. A.A. Starobinsky, 1985 Multicomponent de Sitter (inflationary) stages and the generation of perturbations JETP Lett. 42 152
75. A.A. Starobinsky, 1985 Pisma Zh. Eksp. Teor. Fiz. 42 124
76. M. Sasaki and E.D. Stewart, 1996 A general analytic formula for the spectral index of the density perturbations produced during inflation, Prog. Theor. Phys. 95 71 [astro-ph/9507001]
77. M. Sasaki and T. Tanaka, 1998 Superhorizon scale dynamics of multiscalar inflation, Prog. Theor. Phys. 99 763 [gr-qc/9801017]
78. D.H. Lyth and Y. Rodriguez, 2005 The inflationary prediction for primordial non-Gaussianity, Phys. Rev. Lett. 95 121302 [astro-ph/0504045] (Pubitemid 41505670)
79. G. Rigopoulos and E. Shellard, 2003 The separate universe approach and the evolution of nonlinear superhorizon cosmological perturbations, Phys. Rev. D 68 123518 [astro-ph/0306620] (Pubitemid 44966697)
80. C.T. Byrnes, M. Sasaki and D. Wands, 2006 The primordial trispectrum from inflation, Phys. Rev. D 74 123519 [astro-ph/0611075]
81. D. Babich, P. Creminelli and M. Zaldarriaga, 2004 The shape of non-Gaussianities J. Cosmol. Astropart. Phys. JCAP08(2004)009 [astro-ph/0405356]
82. C.T. Byrnes, M. Gerstenlauer, S. Nurmi, G. Tasinato and D. Wands, 2010 Scale-dependent non-Gaussianity probes inflationary physics J. Cosmol. Astropart. Phys. JCAP10(2010)004 [1007.4277]
83. NL J. Cosmol. Astropart. Phys. JCAP02(2010)034 [0911.2780]
84. J. García-Bellido and D. Wands, 1996 Metric perturbations in two field inflation, Phys. Rev. D 53 5437 [astro-ph/9511029]
85. WMAP collaboration, E. Komatsu et al., 2011 Seven-year Wilkinson Microwave Anisotropy Probe (WMAP) observations: cosmological interpretation, Astrophys. J. Suppl. 192 18 [1001.4538]
86. I.R. Klebanov and A.A. Tseytlin, 2000 Gravity duals of supersymmetric SU(N) × SU(N+M) gauge theories, Nucl. Phys. B 578 123 [hep-th/0002159]
87. C.P. Herzog, I.R. Klebanov and P. Ouyang, D-branes on the conifold and N=1 gauge/gravity dualities, [hep-th/0205100]
88. S. Kecskemeti, J. Maiden, G. Shiu and B. Underwood, 2006 DBI inflation in the tip region of a warped throat J. High Energy Phys. JHEP09(2006)076 [hep-th/0605189]
89. I.R. Klebanov and M.J. Strassler, 2000 Supergravity and a confining gauge theory: duality cascades and chi SB resolution of naked singularities J. High Energy Phys. JHEP08(2000)052 [hep-th/0007191]
90. L. Alabidi and D.H. Lyth, 2006 Inflation models and observation J. Cosmol. Astropart. Phys. JCAP05(2006)016 [astro-ph/0510441]
91. D. Seery, J.E. Lidsey and M.S. Sloth, 2007 The inflationary trispectrum J. Cosmol. Astropart. Phys. JCAP01(2007)027 [astro-ph/0610210]
92. T. Suyama and M. Yamaguchi, 2008 Non-Gaussianity in the modulated reheating scenario, Phys. Rev. D 77 023505 [0709.2545]
93. N.S. Sugiyama, E. Komatsu and T. Futamase, 2011 Non-Gaussianity consistency relation for multi-field inflation, Phys. Rev. Lett. 106 251301 [1101.3636]
94. C. Cheung, P. Creminelli, A.L. Fitzpatrick, J. Kaplan and L. Senatore, 2008 The effective field theory of inflation J. High Energy Phys. JHEP03(2008)014 [0709.0293]
95. L. Senatore and M. Zaldarriaga, 2012 The effective field theory of multifield inflation J. High Energy Phys. JHEP04(2012)024 [1009.2093]