Scale-invariant helical magnetic field evolution and the duration of inflation

被引：22

作者：

Kahniashvili, Tina ^{[1
,2
,3
,4
]}

Brandenburg, Axel ^{[5
,6
,7
,8
,9
,10
]}

Durrer, Ruth ^{[11
,12
]}

Tevzadze, Alexander G. ^{[4
,13
]}

Yin, Winston ^{[1
,2
,14
]}

机构：

[1] Carnegie Mellon Univ, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA

[2] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[3] Laurentian Univ, Dept Phys, Ramsey Lake Rd, Sudbury, ON P3E 2C, Canada

[4] Ilia State Univ, Abastumani Astrophys Observ, GE-0194 Tbilisi, Georgia

[5] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

[6] Univ Colorado, JILA, Boulder, CO 80303 USA

[7] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA

[8] KTH Royal Inst Technol, NORDITA, S-10691 Stockholm, Sweden

[9] Stockholm Univ, S-10691 Stockholm, Sweden

[10] Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, S-10691 Stockholm, Sweden

[11] Univ Geneva, Dept Phys Theor, CH-1211 Geneva 4, Switzerland

[12] Univ Geneva, Ctr Astroparticle Phys, CH-1211 Geneva 4, Switzerland

[13] Javakhishvili Tbilisi State Univ, Fac Exact & Nat Sci, GE-0179 Tbilisi, Georgia

[14] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2017年 / 11期

基金：

美国国家科学基金会;

关键词：

CMBR theory; inflation; Magnetohydrodynamics; MICROWAVE BACKGROUND POLARIZATION; VIOLATING VECTOR-FIELDS; TESTING CPT SYMMETRY; FARADAY-ROTATION; PARITY VIOLATION; CMB; SIMULATIONS; SIGNATURES; TURBULENCE; ORIGIN;

D O I：

10.1088/1475-7516/2017/12/002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider a scale-invariant helical magnetic field generated during inflation. We show that, if the mean magnetic helicity density of such a field is measured, it can be used to determine a lower bound on the duration of inflation. Even if we just have upper bounds on the helicity, these can be used to derive constraints on the minimal duration if one assumes that the magnetic field generated during inflation is helical. Using three-dimensional simulations, we show that an initially scale-invariant field develops, which is similar both with and without magnetic helicity. In the fully helical case, however, the magnetic field appears to have a more pronounced folded structure.

引用

页数：21

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