TY - JOUR
T1 - A note on crossing the phantom divide in hybrid dark energy model
AU - Wei, Hao
AU - Cai, Rong Gen
PY - 2006/3/2
Y1 - 2006/3/2
N2 - Recently a lot of attention has been given to building dark energy models in which the equation-of-state parameter w can cross the phantom divide w=-1. However, to our knowledge, these models with crossing the phantom divide only provide the possibility that w can cross -1. They do not answer another question: why crossing phantom divide occurs recently? Since in many existing models whose equation-of-state parameter can cross the phantom divide, w undulates around -1 randomly, why are we living in an epoch w<-1? This can be regarded as the second cosmological coincidence problem. In this Letter, we propose a possible approach to alleviate this problem within a hybrid dark energy model.
AB - Recently a lot of attention has been given to building dark energy models in which the equation-of-state parameter w can cross the phantom divide w=-1. However, to our knowledge, these models with crossing the phantom divide only provide the possibility that w can cross -1. They do not answer another question: why crossing phantom divide occurs recently? Since in many existing models whose equation-of-state parameter can cross the phantom divide, w undulates around -1 randomly, why are we living in an epoch w<-1? This can be regarded as the second cosmological coincidence problem. In this Letter, we propose a possible approach to alleviate this problem within a hybrid dark energy model.
UR - http://www.scopus.com/inward/record.url?scp=32344447056&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2006.01.043
DO - 10.1016/j.physletb.2006.01.043
M3 - Article
AN - SCOPUS:32344447056
SN - 0370-2693
VL - 634
SP - 9
EP - 13
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1
ER -