Constraining the cosmology of the phantom brane using distance measures

被引：52

作者：

Alam, Ujjaini ^{[1
]}

Bag, Satadru ^{[2
]}

Sahni, Varun ^{[2
]}

机构：

[1] Indian Stat Inst, Phys & Appl Math Unit, Kolkata 700108, India

[2] Inter Univ, Ctr Astron & Astrophys, Pune 411007, India

来源：

PHYSICAL REVIEW D | 2017年 / 95卷 / 02期

关键词：

HUBBLE-SPACE-TELESCOPE; DARK-ENERGY; UNIVERSE; GRAVITY; SINGULARITIES; SUPERNOVAE; HIERARCHY; CONSTANT; LAMBDA; MODEL;

D O I：

10.1103/PhysRevD.95.023524

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The phantom brane has several important distinctive features: (i) Its equation of state is phantomlike, but there is no future "big rip" singularity, and (ii) the effective cosmological constant on the brane is dynamically screened, because of which the expansion rate is smaller than that in ACDM at high redshifts. In this paper, we constrain the Phantom braneworld using distance measures such as type-Ia supernovae (SNeIa), baryon acoustic oscillations (BAO), and the compressed cosmic microwave background (CMB) data. We find that the simplest braneworld models provide a good fit to the data. For instance, BAO + SNeIa data can be accommodated by the braneworld for a large region in parameter space 0 <= Omega(l) less than or similar to 0.3 at 1 sigma. The Hubble parameter can be as high as H-0 less than or similar to 78 km s(-1) Mpc(-1), and the effective equation of state at present can show phantomlike behavior with w(0) less than or similar to -1.2 at 1 sigma. We note a correlation between H-0 and w(0), with higher values of H-0 leading to a lower, and more phantomlike, value of w(0). Inclusion of CMB data provides tighter constraints Omega(l) less than or similar to 0.1. (Here Omega(l) encodes the ratio of the five-and four-dimensional Planck mass.) The Hubble parameter in this case is more tightly constrained to H-0 less than or similar to 71 km s(-1) Mpc(-1), and the effective equation of state to w(0) less than or similar to -1.1. Interestingly, we find that the Universe is allowed to be closed or open, with -0.5 less than or similar to Omega(kappa)less than or similar to 0.5, even on including the compressed CMB data. There appears to be some tension in the low and high-z BAO data which may either be resolved by future data, or act as a pointer to interesting new cosmology.

引用

页数：14

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