Abstract
AbstractNon-canonical scalar fields with the Lagrangian $${{\mathcal {L}}} = X^\alpha - V(\phi )$$
L
=
X
α
-
V
(
ϕ
)
, possess the attractive property that the speed of sound, $$c_s^{2} = (2\,\alpha - 1)^{-1}$$
c
s
2
=
(
2
α
-
1
)
-
1
, can be exceedingly small for large values of $$\alpha $$
α
. This allows a non-canonical field to cluster and behave like warm/cold dark matter on small scales. We derive a general condition on the potential in order to facilitate the kinetic term $$X^\alpha $$
X
α
to play the role of dark matter, while the potential term $$V(\phi )$$
V
(
ϕ
)
playing the role of dark energy at late times. We demonstrate that simple potentials including $$V= V_0\coth ^2{\phi }$$
V
=
V
0
coth
2
ϕ
and a Starobinsky-type potential can unify dark matter and dark energy. Cascading dark energy, in which the potential cascades to lower values in a series of discrete steps, can also work as a unified model.
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
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