A UNIFIED DARK ENERGY MODEL FROM A VANISHING SPEED OF SOUND WITH EMERGENT COSMOLOGICAL CONSTANT

被引：58
|
作者：
Luongo, Orlando [1 ,3 ,5 ]
Quevedo, Hernando [2 ,3 ,4 ]
机构：
[1] Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy
[2] Univ Roma La Sapienza, Dipartimento Fis & Icra, I-00185 Rome, Italy
[3] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico
[4] Relatividade & Astrofis Icra CBPF, Inst Cosmol, BR-22290180 Rio De Janeiro, Brazil
[5] Complesso Univ Monte S Angelo Edificio, Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2014年 / 23卷 / 02期
关键词：
Dark energy; sound speed; emergent cosmological constant; GALAXY REDSHIFT SURVEY; CONSTRAINTS; UNIVERSE; LAMBDA; STATEFINDER; SUPERNOVAE; ANISOTROPY; OMEGA;
D O I：
10.1142/S0218271814500126
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The problem of the cosmic acceleration is here revisited by using the fact that the adiabatic speed of sound can be assumed to be negligible small. Within the context of general relativity, the total energy budget is recovered under the hypothesis of a vanishing speed of sound by assuming the existence of one fluid only. We find a cosmological model which reproduces the main results of the Lambda CDM paradigm at late-times, showing an emergent cosmological constant, which is not at all related with the vacuum energy term. As a consequence, the model presented here behaves as a unified dark energy (DE) model.
引用
收藏
页数：15
相关论文
共 50 条
12345