Primordial magnetic fields: consistent initial conditions and impact on high-z structures

被引：4

作者：

Ralegankar, Pranjal ^{[1
,2
]}

Pavicevic, Mak ^{[1
,2
]}

Viel, Matteo ^{[1
,2
,3
,4
,5
]}

机构：

[1] SISSA Int Sch Adv Studies, Via Bonomea 265, I-34136 Trieste, Italy

[2] INFN Natl Inst Nucl Phys, Via Valerio 2, I-34127 Trieste, Italy

[3] Inst Fundamental Phys Universe, IFPU, Via Beirut 2, I-34151 Trieste, Italy

[4] Osserv Astron Trieste, INAF, Via GB Tiepolo 11, I-34131 Trieste, Italy

[5] ICSC Italian Res Ctr High Performance Comp Big Dat, Via Magnanelli 2, I-40033 Casalecchio Di Reno, BO, Italy

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2024年 / 07期

关键词：

cosmic magnetic fields theory; cosmological simulations; power spectrum; galaxy formation; MASS FUNCTION; 1ST GALAXIES; SIMULATIONS; REIONIZATION; ERA; EVOLUTION; ABUNDANCE; BARYONS; MODEL; BIAS;

D O I：

10.1088/1475-7516/2024/07/027

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Primordial magnetic fields (PMFs) can enhance matter power spectrum on small scales ( less than or similar to Mpc) and still agree with bounds from cosmic microwave background (CMB) and Faraday rotation measurements. As modes on scales smaller than Mpc have already become non-linear today, exploring PMFs' impact on small-scale structures requires dedicated cosmological simulations. Here, for the first time, we perform a suite of hydrodynamical simulations that take into account the different impacts of PMFs on baryons and dark matter. Specifically, in the initial conditions we displace particles according to the Lorentz force from PMFs. We also highlight the large theoretical uncertainty in the peak enhancement of the matter power spectrum due to PMFs, which was not considered in previous studies. We present halo mass functions and show that they can be accurately reproduced using Sheth-Tormen formalism. Moreover, we show that PMFs can generate galaxies with baryon fraction several times larger than the cosmic average at high redshifts. This is simply a consequence of the fact that PMFs enhance baryon perturbations, causing them to be larger than dark matter perturbations. We argue that this scenario could be tested soon by obtaining accurate estimates of the baryon fraction in high redshift galaxies.

引用

页数：44

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