A natural cosmological constant from chameleons

被引：1

作者：

Nastase, Horatiu ^{[1
]}

Weltman, Amanda ^{[2
]}

机构：

[1] Univ Estadual Paulista, Inst Fis Teor, UNESP, BR-01140070 Sao Paulo, SP, Brazil

[2] Univ Cape Town, Astrophys Cosmol & Grav Ctr, Dept Math & Appl Math, ZA-7700 Rondebosch, South Africa

来源：

PHYSICS LETTERS B | 2015年 / 747卷

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1016/j.physletb.2015.05.066

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a simple model where the effective cosmological constant appears from chameleon scalar fields. For a Kachru-Kallosh-Linde-Trivedi (KKLT)-inspired form of the potential and a particular chameleon coupling to the local density, patches of approximately constant scalar field potential cluster around regions of matter with density above a certain value, generating the effect of a cosmological constant on large scales. This construction addresses both the cosmological constant problem (why A is so small, yet nonzero) and the coincidence problem (why A is comparable to the matter density now). (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

引用

页码：200 / 204

页数：5

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