Subdegree cosmic microwave background anisotropies from inflationary bubbles

被引:10
作者
Baccigalupi, C [1 ]
机构
[1] Ist Nazl Fis Nucl, Ferrara, Italy
[2] Osservatorio Astron Roma, I-00136 Rome, Italy
[3] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy
关键词
cosmic microwave background; large-scale structure of universe;
D O I
10.1086/305421
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
It is well known that processes of first-order phase transitions may have occurred in the inflationary era. If one or more occurred well before the end of inflation, the nucleated bubbles would have been stretched to large scales and the primordial power spectrum would contain a scale-dependent non-Gaussian component provided by the remnants of the bubbles. We predict the anisotropies in the cosmic microwave background (CMB) induced by inflationary bubbles. We build a general analytic model for describing a bubbly perturbation, evolve each Fourier mode using the linear theory of perturbations from reheating until decoupling, and get the CMB anisotropies by considering the bubbly perturbation intersecting the last scattering surface. The CMB image of an inflationary bubble is a series of concentric isothermal rings of different color (sign of delta T/T) on the scale of the sound horizon at decoupling (less than or equal to 1 degrees in the sky); the resulting anisotropy is therefore strongly non-Gaussian. The mean amplitude of delta T/T for a bubble of size L follows the known estimates for linear perturbations, delta T/T similar or equal to delta rho/rho(L/H-1)(2). In particular, bubbles with size corresponding to the seeds of the observed large-scale voids (tens of comoving Mpc) induce an interesting pattern of CMB anisotropies on the subdegree angular scale, to be further investigated and compared with the forthcoming high-resolution CMB maps provided by the Microwave Anisotropy Probe (MAP) and the Planck experiments.
引用
收藏
页码:615 / 623
页数:9
相关论文
共 25 条
  • [1] The case against scaling defect models of cosmic structure formation
    Albrecht, A
    Battye, RA
    Robinson, J
    [J]. PHYSICAL REVIEW LETTERS, 1997, 79 (24) : 4736 - 4739
  • [2] Reconstruction of the bubble nucleating potential
    Amendola, L
    Baccigalupi, C
    Konoplich, R
    Occhionero, F
    Rubin, S
    [J]. PHYSICAL REVIEW D, 1996, 54 (12): : 7199 - 7206
  • [3] Non-Gaussian likelihood function and COBE data
    Amendola, L
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1996, 283 (03) : 983 - 989
  • [4] Peaks and rings on the cosmic microwave background
    Amendola, L
    Baccigalupi, C
    Occhionero, F
    [J]. ASTROPHYSICAL JOURNAL, 1998, 492 (01) : L5 - L8
  • [5] Stochastic gravitational background from inflationary phase transitions
    Baccigalupi, C
    Amendola, L
    Fortini, P
    Occhionero, F
    [J]. PHYSICAL REVIEW D, 1997, 56 (08): : 4610 - 4617
  • [6] Imprints of primordial voids on the cosmic microwave background
    Baccigalupi, C
    Amendola, L
    Occhionero, F
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1997, 288 (02) : 387 - 396
  • [7] The mass distribution in the nearby universe
    daCosta, LN
    Freudling, W
    Wegner, G
    Giovanelli, R
    Haynes, MP
    Salzer, JJ
    [J]. ASTROPHYSICAL JOURNAL, 1996, 468 (01) : L5 - +
  • [8] Doppler peaks in the angular power spectrum of the cosmic microwave background: A fingerprint of topological defects
    Durrer, R
    Gangui, A
    Sakellariadou, M
    [J]. PHYSICAL REVIEW LETTERS, 1996, 76 (04) : 579 - 582
  • [9] A 120-Mpc periodicity in the three-dimensional distribution of galaxy superclusters
    Einasto, J
    Einasto, M
    Gottlober, S
    Muller, V
    Saar, V
    Starobinsky, AA
    Tago, E
    Tucker, D
    Andernach, H
    Frisch, P
    [J]. NATURE, 1997, 385 (6612) : 139 - 141
  • [10] ElAd H, 1996, ASTROPHYS J, V462, pL13, DOI 10.1088/1538-4357/462/1/L13