Annals of Physics 426 (2021) 168403
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Annals of Physics
journal homepage: www.elsevier.com/locate/aop
Rényi holographic dark energy in higher
dimension Cosmology
∗
A. Saha b , S. Ghose a , , A. Chanda c , B.C. Paul c
a
ICARD, Physics Department, University of North Bengal, Rajarammohunpur, West
Bengal, 734013, India
b
A. Saha Jalpaiguri Govt. Engineering College, Jalpaiguri, West Bengal, 735102, India
c
Physics Department, University of North Bengal, Rajarammohunpur, West Bengal, 734013, India
article
info
Article history:
Received 23 September 2020
Accepted 11 January 2021
Available online 20 January 2021
Keywords:
Holographic dark energy
Higher dimension
Kaluza–Klein theory
a b s t r a c t
Rényi holographic dark energy (RHDE) correspondence is discussed in higher dimensional cosmology, namely Kaluza–Klein
(KK) cosmology. Both interacting and non-interacting cosmological scenario are considered here. It is found that the noninteracting model naturally leads to the late accelerated universe,
unlike the standard Holographic Dark Energy models in 4D,
which requires interaction to accommodate the late-time acceleration of the universe. The interacting model produces an
accelerating universe at late time albeit failing to attain the
estimated present value of the deceleration parameter. The evolution of different cosmologically relevant parameters have been
estimated. We consider here two diagnostic tests namely, statefinder and Om diagnostics to study the non-interacting model
which is more favoured in the light of recent cosmological
observations. Classical stability of the cosmological models is also
discussed.
© 2021 Elsevier Inc. All rights reserved.
1. Introduction
Present observations favour that our universe is flat [1,2] and it is passing through a phase of
accelerated expansion at the present epoch [3–6]. General Relativity (GR hereafter) can accommodate such a phase in the presence of a cosmological constant. However, the magnitude of the
∗ Corresponding author.
E-mail addresses:
[email protected] (A. Saha),
[email protected] (S. Ghose),
[email protected] (A. Chanda),
[email protected] (B.C. Paul).
https://doi.org/10.1016/j.aop.2021.168403
0003-4916/© 2021 Elsevier Inc. All rights reserved.
A. Saha, S. Ghose, A. Chanda et al.
Annals of Physics 426 (2021) 168403
cosmological constant, as predicted by the present observations, cannot be explained from any
fundamental theory. Consequently, modifications of the gravitational sector or matter sector of
the Einstein–Hilbert action are proposed in the literature to describe the present acceleration of
the universe. Recently, there has been a spurt in activities in the modified theories of gravity,
namely, f (R), f (G), f (T ), (where R represents the Ricci scalar, G represents the Gauss–Bonnet
terms and T represents the torsion scalar) and other theories [7–14]. The modifications of GR
assumes generic functions of the Ricci scalar or the Gauss–Bonnet terms or torsion scalar for the
gravitational action instead of the linear term in the Einstein–Hilbert action. The modified gravity
theories possess interesting properties that can resolve some of the important issues in cosmology
including the accelerated expansion of the present universe. On the other hand, the modification
of the matter sector can be considered in the presence of dynamical fluids with negative pressure
unlike the cosmological constant. These are commonly known as Dark Energy (DE), and a volume
of papers appeared in the literature discussing cosmological models with dynamical dark energy
[11,15–23]. In this context thermodynamical scenario have been considered in the literature where
the Benkenstein–Hawking (BH hereafter) entropy (proportional to the area of the horizon) and
the Holographic Principle (number of degrees of freedom of any physical system should scale with
the boundary surface and not with the volume) [24–26] play an important role. The holographic
principle essentially states that in any physical system, the number of degrees of freedom should scale
not with the volume but with the boundary surface. Holographic dark energy (HDE) models have
been considered in the literature [27–31] to study cosmic problems. In the cosmological context,
the choice of long-distance cutoff or infrared cut off (IR cut off hereafter) of HDE models is not
uniquely defined. Hubble horizon is a natural candidate for IR cut off but as shown in [32], the
choice fails to accommodate the late-time acceleration. Zimdahl and Pavón [33] later shown that
inclusion of an interaction could resolve such issues (Ref. [34] for a detailed review of different
HDE models). Klauza–Klein (KK hereafter) theory was originally studied with the hope of unifying
gravity and gauge theories [35,36] by introducing an extra dimension. KK theory has been used
as a framework for many cosmological models to address some of the long-standing problems of
the early and late universe which cannot be addressed within GR. Some of these models adhere
to the original motivation of KK theory with a compact extra dimension [37,38] while others have
considered non-compact theories where the extra dimension was treated as a parameter, defining
4D universe embedded in a five-dimensional space–time [39]. The compactness, or the lack of it,
is not the only source of variety in KK cosmology. Rich structure of the theory also stems from the
presence of a source in 5D in the presence and absence of cosmological constant, and inclusion of
fewer or more degrees of freedom by the 5D metric. The purest form of KK theory is worth studying
if one is guided by the hope of the complete geometrization of physics as the theory is capable of
inducing matter in 4D by 5D vacuum theory [40,41]. The curvature of the five-dimensional space–
time can also induce effective properties of matter in four dimensions (Campbell’s theorem) [42,43].
Another important property of classical KK theories is that they can be treated as emergent entropic
gravity models [44]. This makes the study of HDE models in KK gravity particularly interesting. In
the present work, we propose a Rényi holographic dark energy correspondence in the compact
framework of KK cosmology.
The paper is organized as follows: in Section 2 a brief overview of Reényi entropy is presented, in
Section 3 relevant field equations are developed, in Section 4, in Section 5 state finder diagnostics
and stability of the model are studied, in Section 6 an interacting RHDE model is discussed and
finally in Section 7 results from interacting and non-interacting situations are compared and overall
findings are summarized.
2. General idea of Rényi entropy
In non-extensive thermodynamics the Tsallis entropy (ST ) [45–48] for a set of W states is defined
as
ST = kB
1−
∑W
i=1
q−1
q
pi
(
W
∑
i=1
)
pi = 1; q ∈ R ,
2
(1)
A. Saha, S. Ghose, A. Chanda et al.
Annals of Physics 426 (2021) 168403
∑
where pi is the probability associated to the ith microstate with i pi = 1 and q is any real number.
Tsallis holographic dark energy has been extensively studied in the context of cosmology [49–51]
Org
The original Rényi entropy (SR ), on the other hand, is defined as [45]:
Org
SR
= kB
ln
q
∑W
i =1
pi
=
q−1
1
1−q
ln [1 + (1 − q)ST ] .
(2)
It is interesting that both Eqs. (1) and (2) lead to Boltzmann–Gibbs entropy for q = 1. Recently,
it has been proposed that the Benkenstein–Hawking (SBH ) entropy too is a kind of non-extensive
entropy which leads to a novel type of Rényi entropy [47] which is given by:
1
ln (1 + δ SBH ) ,
(3)
δ
where δ = 1−q and for δ = 0, SR = SBH . In cosmology, Rényi holographics dark energy is extensively
SR =
considered [52,53]. It is shown in [54] that when Rényi entropy is employed at the horizon it results
in an accelerating universe in the Rastall framework. In the present work, the Rényi entropy is
considered for describing the entropy on the Hubble horizon. As SBH = A4 (where A is the area of
the horizon), one obtains
SR =
1
δ
(
ln 1 +
A
4
)
δ .
(4)
3. Cosmology in KK framework and RHDE correspondence
The Einstein field equation in higher dimension is given by:
RAB −
1
2
(5)
gAB R = κ TAB ,
where A and B run from 0 to 4, RAB is the Ricci tensor, R is the Ricci scalar and TAB is the energy–
momentum tensor and κ = 8π G5 where G5 is the five dimensional gravitational constant. The
5-dimensional space–time metric of the KK cosmology is (see Ref. [55]):
dr 2
(
+ r 2 dθ 2
)
) (
+sin2 θ dφ 2 + 1 − kr 2 dψ 2 ] ,
ds2 = dt 2 − a2 (t) [
1 − kr 2
(6)
where a(t) is the scale factor and k = 0, 1(−1) represents the curvature parameter for flat and
closed(open) universe. We consider a cosmological model where KK universe is filled with a perfect
fluid. The Einstein’s field equation for the metric, given by (6), becomes:
ρ=6
ȧ2
+6
a2
p = −3
ä
a
k
a2
−3
(7)
,
ȧ2
a2
−3
k
a2
(8)
.
For simplicity, we shall consider a flat universe (k = 0). Using Eqs. (7) and (8) we get for the
time-time and space-space component of the field equations as:
ρ=6
ȧ2
a2
p = −3
(9)
,
ä
a
−3
ȧ2
a2
(10)
.
The Hubble parameter is defined as H =
ȧ
a
µν
and from T;ν = 0 the continuity equation follows as:
ρ̇ + 4H(ρ + p) = 0.
(11)
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Annals of Physics 426 (2021) 168403
Using the equation of state p = ωρ in the equation of continuity in five dimension we get,
ρ̇ + 4H ρ (1 + ω) = 0.
(12)
We now consider two types of cosmic fluids. Total energy density is expressed as ρ = ρD + ρm ,
ρ
where ρD corresponds to the dark energy and ρm is the matter energy density where wm = pm . For
m
non-interacting fluid, the conservation equations for (pD , ρD ) and (pm , ρm ) are separately satisfied:
ρ̇m + 4H ρm (1 + ωm ) = 0,
(13)
ρ̇D + 4H ρD (1 + ωD ) = 0.
(14)
Let us define the dimensionless density parameters as:
Ωm =
ρD
ρm
, ΩD =
,
ρcr
ρcr
(15)
where ρcr = 6H 2 . Eq. (9) can be written in terms of density parameters as:
Ωm + ΩD = 1.
(16)
The ratio of the energy densities is given by:
r =
Ωm
1 − ΩD
ρm
=
=
.
ρD
ΩD
ΩD
(17)
Considering the time derivative of Eq. (9) and using Eqs. (13), (14), and (17) we obtain:
Ḣ
H2
= −2 (1 + ωD ΩD )
(18)
Blackhole thermodynamics can be implemented in describing the thermodynamics of cosmological models. In fact, the first law of thermodynamics dET = TdS can be considered for the
thermodynamical representation of the cosmological horizon. Here ET denotes the total energy
of the universe, T = 2π1 L , the Cai-Kim temperature for a system with IR cutoff L, corresponds to
the temperature of the de-Sitter horizon and apparent horizon in flat FRW cosmology, S is the
horizon entropy. Similarly, in the DE dominated present universe, it is possible to take the relation
dED = ρD dV ∝ dET = TdS, where ED denotes the energy content for the DE representative.
The apparent horizon is a proper casual boundary for a universe in agreement with the
thermodynamical laws and thus the energy–momentum conservation law emerge out. Therefore,
considering the Hubble radius as the IR cutoff (L = H −1 ), we obtain the energy density for DE (ρD )
candidate which is given by
ρD = B T
dS
dV
(19)
,
where B is the proportionality constant. Again using the temperature relation T = 2Hπ . The above
expression can be integrated to get the functional form of ρD . RHDE correspondence can then be
drawn following Ref. [56], in a 5-dimensional KK-cosmology, we represent here the vacuum energy
density which plays the role of the dark energy. We consider DE of the universe as given by RHDE
in 5-dimension which is
ρD =
BH 2
(
8π 1 +
δπ
H2
(20)
),
where B = 3C 2 , and C 2 is a numerical constant.
From Eq. (14) and the time derivative of Eq. (20) one gets:
ρ̇D
Ḣ
=4
ρD
H
(
C 2 − ΩD
C2
)
(21)
,
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A. Saha, S. Ghose, A. Chanda et al.
Annals of Physics 426 (2021) 168403
Fig. 1. Evolution of dark energy EoS parameter ωD for different values of model parameter δ . A quintessence era in early
universe followed by a phantom phase and finally convergence into another late time quintessence phase is seen.
where,
ΩD =
C2
2
(
1+
δπ
H2
)−1
(22)
.
4. Evolution of universe
Evolution of the universe, within the present model, can be explored with the field equations
obtained in the previous section. The equation of state (EOS hereafter) parameter for the dark energy
is obtained from Eqs. (14), (18), and (21), which becomes:
ωD =
C 2 − 2ΩD
C 2 − 2ΩD (C 2 − ΩD )
(23)
.
The expression for ΩD , as obtained from Eqs. (18) and (22), is:
1 [
ΩD =
2
√
1 + 2b(z + 1)4 ±
]
1 + 4b(z + 1)4 (1 − C 2 ) + 4b2 (z + 1)8 ,
where b =
ΩD0 (1−ΩD0 )
,
C 2 −2ΩD0
(24)
with ΩD0 being the present value of the density parameter for dark energy.
The evolution of EoS parameter is shown in Fig. 1. The dark energy begins in a quintessence
era (ωD > −1), but evolves into a phantom (ωD < −1) era, and finally converges to another
quintessence era in late time. The initial and final phase of the EoS parameter is independent of
the δ value, however it varies considerably with δ in the present epoch. For lower δ values the
universe transits into the phantom era faster as compared to higher δ values. Another important
parameter is the deceleration parameter (q = − aHä 2 ) which can be obtained from Eqs. (18) and (23):
q=
C 2 − 2ΩD2
C2
(25)
− 2ΩD (C 2 − ΩD )
Fig. 2 show the evolution of deceleration parameter. It is shown that the model permits latetime acceleration of the universe, and if δ is less the universe entered the accelerated phase earlier.
Evolution of dark energy and its late-time dominance are evident from the evolution of density
parameter ΩD which is shown in Fig. 3. It is seen that the dark energy contribution was small earlier
but at the present epoch it increases. It is also found that in future ΩD attained a value which is
independent of δ , but in the past lower value of δ implies more ΩD .
5
A. Saha, S. Ghose, A. Chanda et al.
Annals of Physics 426 (2021) 168403
Fig. 2. State of acceleration of universe at different stage of evolution. The deceleration parameter (q) value goes to
negative in recent past, suggesting a late-time acceleration of universe. For different value of the model parameter δ ,
present value of q is seen to vary from −0.5 to −0.1 which is very much acceptable in light of supernovae data.
Fig. 3. Evolution of density parameter ΩD with redshift (z) for different values of model parameter δ . The evolution
converges to the present value of ΩD ≈ 0.7 which is acceptable. Dark energy clearly dominates the late-universe and
gradually evolves to ΩD = 1 in the future, regardless of δ value.
5. Diagnostics and stability
The statefinder diagnostic pair (r , s) was first introduced in ref. [57,58]. The parameters are
defined as:
...
a
r −1
,
(26)
, s≡
r ≡
aH 3
3(q − 1/2)
where q = − aHä 2 is the deceleration parameter. For the present model we study the evolution of
r(z) and s(z) shown in Fig. 4. For any ΛCDM model with non-zero Λ the statefinder pair becomes
(1, 0). In the present model the statefinder values very close to the ΛCDM model is obtained in the
near future. So we conclude that the cosmological model admits a ΛCDM scenario in the negative
redshift regime.
To further explore the nature of dark energy we consider Om diagnostic. To determine Om
diagnostic we define following [59]:
Om(x) =
h2 (x) − 1
x3
−1
, x = 1 + z , h(x) =
H(x)
H0
6
.
(27)
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Annals of Physics 426 (2021) 168403
Fig. 4. Plot of statefinder pairs with redshift (z). At present epoch the model is close to ΛCDM model. In near future the
model coincides with ΛCDM model.
Fig. 5. Evolution of Om clearly suggests that the dark energy might have evolved from a phantom phase in recent past.
Presently however it is of the quintessence nature. Om is constant for the ΛCDM model and its value depends on Ωm0 .
A typical case of ΛCDM model is shown in the figure for Ωm0 = 0.27. The blue solid line denotes evolution of the Om
parameter with redshift parameter z and the green dashed line denotes the ΛCDM case.
Comparison of the Om values at two different points gives valuable insight about the nature of the
dark energy. For example, if we consider two different x values like x1 and x2 where x1 < x2 , for
a ΛCDM model Om(x1 , x2 ) ≡ Om(x1 ) − Om(x2 ) = 0. If Om(x1 , x2 ) < 0 the dark energy is phantom
and for Om(x1 , x2 ) > 0 the dark energy is of quintessence type. Evolution of Om is shown in Fig. 5.
The cosmological model with Rényi dark energy corresponds to quintessence matter at present.
However it might recently made a transition from phantom phase (at around z = 0.39).
Classical
( ) stability of a dark energy model can be discussed based on the squared sound speed
vs2 =
∂P
∂ρ
2
. For the present model, vs2 is given by:
v = ωD +
2
(C 2 − 2ΩD )ΩD C 2 (C 2 − 2ΩD ) − (C 2 − 2ΩD )
(C 2 − ΩD )
[
[
(
C 2 − 2ΩD C 2 − ΩD
)]2
]
.
(28)
The evolution of the squared sound speed is shown in Fig. 6. The cosmological model remains
unstable (v 2 < 0) in the past. However, the model is stable (v 2 > 0) at the present epoch and
will remain so in future.
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Annals of Physics 426 (2021) 168403
Fig. 6. Classical stability of the non-interacting RHDE model.
6. Interacting RHDE model
Considering two types of fluids that are interacting. We study the evolution of the universe here.
The total energy density is then given by: ρ = ρD + ρm , where ρD is density of the dark energy and
ρm that of the matter. The conservation equations for (pD , ρD ) and (pm , ρm ) are separately satisfied
for the non-interacting fluids. For the interacting dark energy models, however, we have:
ρ̇m + 4H ρm (1 + ωm ) = Q ,
(29)
ρ̇D + 4H ρD (1 + ωD ) = −Q ,
(30)
where Q gives the interaction between the dark energy and the dark matter. As suggested in [60],
ρ
let us consider Q = Γ ρD and denote the ratio of the energy densities with r (r = ρm ); Γ being the
D
decay rate. An effective equation of state can be defined (see [61]) as:
1 Γ
Γ
eff
and ωm
=−
.
4H
r 4H
The continuity equations as obtained from above consideration are:
ωDeff = ωD +
(31)
eff
ρ̇m + 4H ρm (1 + ωm
) = 0,
(32)
ρ̇D + 4H ρD (1 + ωDeff ) = 0.
(33)
Eqs. (31), (21), and (18) lead to an expression for the effective equation of state parameter:
ωDeff =
(C 2 − 2Ωd ) − 2b2 (C 2 − Ωd )
C 2 − 2Ωd (C 2 − Ωd )
(34)
.
eff
Evolution of the effective EOS parameter (ωD ) is shown in Fig. 7. The effective EOS parameter fails
to achieve the observationally favoured value which is close to −1. Eqs. (22) and (18) give:
′
ΩD =
4ΩD (c 2 − 2ΩD ) c 2 (1 − ΩD ) − b2 ΩD (c 2 − ΩD )
[
c 2 − 2ΩD (c 2 − ΩD )
dΩ
]
.
(35)
where ΩD′ = −(1 + z) dzD . As seen from the Eq. (35) evolution of the density parameter depends
on both the model parameter δ and the coupling parameter b2 . It is seen that the future evolution
of the density parameter is more affected by the variation in the coupling parameter value (Fig. 9).
For example, although the dark energy dominates in the future universe, its share is suppressed
for a lower value of b2 as seen from Fig. 8. On the other hand, the past evolution of the density
parameter is more dependent on the model parameter (δ ) which is plotted in Fig. 9. For a lower
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A. Saha, S. Ghose, A. Chanda et al.
Annals of Physics 426 (2021) 168403
Fig. 7. Evolution of EOS parameter with redshift for different values of δ .
Fig. 8. Evolution of density parameter with redshift for different values of coupling constant.
value of δ indicates that the share of dark energy was significantly lower in the past than that with
a higher value of δ . In future, this δ dependence will reverse. The deceleration parameter (q) is
obtained using Eqs. (18) and (34).
q=
c 2 − 2ΩD2 − 4b2 ΩD (c 2 − ΩD )
c 2 − 2ΩD (c 2 − ΩD )
(36)
.
Evolution of deceleration parameter with redshift z is shown in Fig. 10. The transition redshift is
different for different values of δ . More importantly, it is seen that the deceleration parameter value
goes below −0.4 while the observationally favoured value for the present epoch is around −0.6
which maybe attained for a less value of δ . Finally, classical stability of the model can be investigated
calculating the adiabatic sound speed, which is given by:
v 2 = ωdeff +
M
[
(c 2 − ΩD ) c 2 − 2ΩD (c 2 − ΩD )
where,
]2 ,
[
−c 2 (2b2 − 1)(c 2 − 2ΩD )
]
+ (b2 − 1)(c 2 − 2ΩD2 ) .
M = (c 2 − 2ΩD )ΩD
9
(37)
A. Saha, S. Ghose, A. Chanda et al.
Annals of Physics 426 (2021) 168403
Fig. 9. Evolution of density parameter with redshift for different values of δ .
Fig. 10. Evolution of deceleration parameter with redshift in interacting model.
Evolution of the classical stability is shown in Fig. 11. We note that the KK-model, is not stable. This
is in contrast with the interacting fluids with standard holographic dark energy models and Tsallis
holographic dark energy models, studied in the compact KK framework, where a classically stable
cosmological model can be obtained (for detail see. [62,63]). In an interacting cosmological model
we do not find a classically stable universe and it does not yield present value of the cosmological
parameters in the range suggested by the observations. Thus, an interacting cosmological model
with Rényi dark energy in a 5-dimensional KK-model is not acceptable at the present epoch.
However, the interaction might have occurred at the early universe. On the other hand, for a noninteracting RHDE with other fluids the cosmological model obtained here is found stable at the
present epoch but it permits an unstable universe in the past.
7. Discussion
The holographic dark energy (HDE) models are worth discussing particularly in the absence
of a definite quantum theory of gravity. KK framework was originally proposed with the hope
of unifying gravity with the other gauge theories. Consequently, the study of HDE models in the
KK framework is interesting in itself. HDE models in cosmology are explored in the KK gravity
[60,62]. Recently, Tsallis and Rényi holographic dark energy models are considered in cosmology as
a non extensive extension of HDE. In the present work, both non-interacting and interacting Rényi
holographic dark energy models are explored in the KK gravity framework. As mentioned earlier
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Annals of Physics 426 (2021) 168403
Fig. 11. Classical stability of the interacting RHDE model.
that accommodating a late time phase of acceleration is often challenging in HDE models without
interaction in the dark sector. We show here that with the Rényi entropy in KK framework, the latetime acceleration of the universe can be naturally realized. Table 1 shows a comparison between
observationally favoured values of different cosmological parameters and the same obtained from
the present model. Interestingly, whereas in the case of standard holographic dark energy models
in 4D, interaction is needed for viable late time behaviour, Rényi holographic dark energy in KK can
achieve this feat without interaction between dark energy and dark matter. It is seen (Table 2)
that the interacting model fails to produce observationally accepted values of the cosmological
parameters at the present epoch. While the non-interacting model has a prolonged classically
stable region and the non-interacting model remains classically stable at every epoch. It was shown
in [64] that classically stable non-interacting Rényi holographic dark energy can be obtained in
loop quantum gravity also. The instability of the interacting model also may be specific to the
prescription discussed here to introduce the interaction in the first place. Note that the prescription
works well with standard HDE [60,62]. It is interesting that in [65] the author also found the Rényi
model which is classically unstable. There, it was noted that the sound speed was highly sensitive
to the model parameter δ . It was also observed that the negativity of sound-speed became more
pronounced for a lower value of δ . In the present work the finding has been in the same tune as is
apparent from Fig. 11. The difference between Benkenstein and Rényi entropy has been noted earlier
in [66], where the authors also showed how Rényi entropy would successfully describe a late-time
acceleration as well as an early inflationary phase. Present observations suggest that the dark energy
EoS parameter is very close to −1. The interacting model cannot attain such a phase in any stage of
evolution. In the non-interacting model, on the other hand, the dark energy EoS parameter is very
close to −1 in the present epoch and accumulates ΛCDM in the future. In course of evolution noninteracting dark energy passes through an initial quintessence phase, a phantom phase, and finally
another quintessence phase. The interacting dark energy model, however, never passes through any
phantom phase. Two different diagnostic tests, namely Statefinder and Om diagnostics have been
done with the non-interacting model. These tests independently confirms that in the future the
dark energy model will coincide with a ΛCDM cosmology. The interacting model considered here
has not been investigated further in absence of any classically stable region at any epoch. In both
the scenarios considered here, cosmological parameters are sensitive in near future and near past
on the model parameters δ , and in the case of the interacting model, they are sensitive to decay
rate too. Thus it is found that a flat universe described by non-interacting Rényi dark energy in
KK-model is favourable for a stable present universe. Present observations may put a reasonable
constraint on the model parameters, but that is beyond the scope of the present discussion and
would be taken up in a separate work (see Table 2).
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Annals of Physics 426 (2021) 168403
Table 1
Cosmological parameters for non-interacting RHDE model.
Parameter
Observation
Non interacting model
q0
≈ −0.6 ± 0.02
≈ −1
0.6911 ± 0.0062
≈ −0.6
−1.013
ωD0
ΩD0
0.7329
Table 2
Cosmological parameters for interacting RHDE model.
Parameter
Observation
Interacting model
q0
≈ −0.6 ± 0.02
≈ −1
0.6911 ± 0.0062
≈ −0.4
−0.4
ωD0
ΩD0
0.7300
CRediT authorship contribution statement
A. Saha: Conceptualization, Methodology, Investigation. S. Ghose: Conceptualization, Software,
Visualization, Writing - original draft, Supervision. A. Chanda: Software, Visualization, Rewritingediting. B.C. Paul: Supervision, Rewriting-editing, Validation.
Declaration of competing interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgements
The authors would like to thank IUCAA Centre for Astronomy Research & Development (ICARD),
North Bengal University for extending research facilities. AC would like to thank University of North
Bengal for providing senior research fellowship. BCP would like to thank DST-SERB Govt. of India
(File No.: EMR/2016/005734) for a project support. SG would like to thank HECRC, NBU for visiting
associateship.
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