Double inflation and the low CMB quadrupole

被引：114

作者：

Feng, B ^{[1
]}

Zhang, XM ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China

来源：

PHYSICS LETTERS B | 2003年 / 570卷 / 3-4期

基金：

中国国家自然科学基金;

关键词：

cosmology; cosmic microwave background; double inflation;

D O I：

10.1016/j.physletb.2003.07.065

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent released WMAP data show a low value of quadrupole in the CMB temperature fluctuations, which confirms the early observations by COBE. In this Letter we consider a model of two inflatons with different masses, V(01, 02) V (phi(1),phi(2)) = 1/2m(1)(2)phi(1)(2)+1/2m(2)(2)phi(2)(2), m(1) > m(2) and study its effects on CMB of suppressing the primordial power spectrum P(k) at small k. Inflation is driven in this model firstly by the heavier inflaton phi(1), then the lighter field phi(2). But there is no interruption in between. We numerically calculate the scalar and tensor power spectra with mode by mode integrations, then fit the model to WMAP temperature correlations TT and the TE temperature-polarization spectra. Our results show that with m(1) similar to 10(14) GeV and m(2) similar to 10(13) GeV, this model solves the problems of flatness, etc. and the CMB quadrupole predicted can be much lower than the standard power-law ACDM model. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：145 / 150

页数：6

共 43 条

[1] Four-year COBE DMR cosmic microwave background observations: Maps and basic results [J].

Bennett, CL ;

Banday, AJ ;

Gorski, KM ;

Hinshaw, G ;

Jackson, P ;

Keegstra, P ;

Kogut, A ;

Smoot, GF ;

Wilkinson, DT ;

Wright, EL .

ASTROPHYSICAL JOURNAL, 1996, 464 (01) :L1-&

[2]

BENNETT CL, ASTROPH0302207

[3]

BRIDLE SL, ASTROPH0303180

[4]

BRIDLE SL, ASTROPH0302306

[5]

CALDWELL RR, ASTROPH0302505

[6]

CHUNG D, ASTROPH0305193

[7]

CLINE JM, ASTROPH0304558

[8]

CONTALDI CR, ASTROPH0303636

[9] Toward a precise measurement of matter clustering:: Lyα forest data at redshifts 2-4 [J].

Croft, RAC ;

Weinberg, DH ;

Bolte, M ;

Burles, S ;

Hernquist, L ;

Katz, N ;

Kirkman, D ;

Tytler, D .

ASTROPHYSICAL JOURNAL, 2002, 581 (01) :20-52

[10]

EFSTATHIOU G, ASTROPH0303127

← 1 2 3 4 5 →