# Reconstructions of *f*(*T*) gravity from entropy-corrected holographic and new agegraphic dark energy models in power-law and logarithmic versions

## Abstract

Here, we peruse cosmological usage of the most promising candidates of dark energy in the framework of *f*(*T*) gravity theory where *T* represents the torsion scalar teleparallel gravity. We reconstruct the different *f*(*T*) modified gravity models in the spatially flat Friedmann–Robertson–Walker universe according to entropy-corrected versions of the holographic and new agegraphic dark energy models in power-law and logarithmic corrections, which describe an accelerated expansion history of the universe. We conclude that the equation of state parameter of the entropy-corrected models can transit from the quintessence state to the phantom regime as indicated by recent observations or can lie entirely in the phantom region. Also, using these models, we investigate the different areas of the stability with the help of the squared speed of sound.

## Keywords

Dark Energy Dark Energy Model Holographic Dark Energy Logarithmic Correction Conformal Time## 1 Introduction

The type Ia Supernovae and cosmic microwave background (CMB) [1, 2] observations point out that our universe is precisely accelerating, which is caused by some unknown fluid having positive energy density and negative pressure, called “Dark Energy” (DE). Observations indicate that dark energy occupies about 70 % of the total energy of the universe, whereas the contribution of dark matter is 26 % and the rest 4 % is baryonic matter. For related review works see Refs. [3, 4]. Although a long-time argument has been made on this interesting issue of modern cosmology, we still have little knowledge about DE. The cosmological constant \(\Lambda \) is the most appealing and simplest candidate for DE which obeys the equation of state parameter \(w=-1\). However, the cosmological constant suffers from two serious theoretical problems, i.e., the cosmological constant problem and the coincidence problem. In this respect, different dynamical DE models and different modified theories of gravity have been developed. Moreover, the reconstruction phenomenon of different DE models [5, 6, 7, 8] is gaining great attention in the discussion of the accelerated expansion of the universe.

In recent years, an interesting idea has been proposed: to study the dark energy in the new form, i.e., the Holographic Dark Energy (HDE) model [9, 10, 11], which arises from the holographic principle [12] stating that the number of degrees of freedom of a physical model must be finite [13] and an infrared cut-off should constrain it [14]. In quantum field theory [14], for developing a black hole , the UV cut-off \(\Lambda \) should relate with the IR cut-off *L* due to the limit set. In Ref. [15] Li debated the relation \(L^{3} \rho _{\Lambda }\le L M_{P}^{2}\), where \(\rho _{\Lambda }\) is the quantum zero point energy density and \(M_{P}=\frac{1}{\sqrt{8\pi G}}\) is the reduced Planck mass, i.e., the mass of a black hole of the size *L* should not be exceeded by the total energy in a region of same size. The HDE models have been discussed in [16, 17, 18, 19, 20]. The black hole entropy \(S_\mathrm{BH}\) plays an important role in the simplification of HDE, given as usually, \(S_\mathrm{BH}=\frac{A}{4G}\), where \(A\sim L^{2}\) is the area of the horizon.

*T*) of the universe is present in the expression of the energy density, given by

There is an another discussion for the cosmic acceleration of the universe (predicted from observational data), the so-called “modified gravity” where we do not require any additional components like DE (for a review see [36]) for the acceleration of the universe. Various kinds of modified theories have been proposed such as the *f*(*R*) [38], *f*(*G*) [39, 40], Horava–Lifshitz [41] and Gauss–Bonnet [42, 43] theories of gravity. Recently, [44, 45] formulated a new kind of theory of gravity known as *f*(*T*) gravity in a space-time possessing absolute parallelism. *f*(*T*) gravity has been recently studied in [46, 47]. In the *f*(*T*) theory of gravity, the teleparallel Lagrangian density gave a description of the torsion scalar *T*, using a function of *T*, i.e., *f*(*T*), for the late-time cosmic acceleration [48]. In a recent work, Jamil et al. [49, 50] investigated the interacting DE model and state-finder diagnostic in *f*(*T*) cosmology.

Recently, the reconstruction of various types of modified gravities *f*(*R*), *f*(*T*), *f*(*G*), Einstein–aether etc. with the various dark energy models have made a plea topic in cosmology [51, 52, 53, 54, 55]. Farooq et al. [56] reconstructed *f*(*T*) and *f*(*R*) gravity according to (*m*, *n*)-type holographic dark energy, Karami et al. [57] did the reconstruction of *f*(*R*) modified gravity from ordinary and entropy-corrected versions of holographic and new agegraphic dark energy models and also Debnath [58] discussed the topic of reconstruction of *f*(*R*), *f*(*G*), *f*(*T*), and Einstein–aether gravities from entropy-corrected (*m*, *n*) type pilgrim dark energy. Motivated by these works, with the help of modified *f*(*T*) gravity and considering the entropy-corrected versions of the HDE and NADE scenarios, it is interesting to investigate how the *f*(*T*)-gravity can describe ECHDE and ECNADE densities in power-law and logarithmic versions as effective theories of DE models.

This paper is arranged as follows. In Sect. 2, we give a brief idea of the theory of *f*(*T*) gravity and corresponding solutions for a FRW background. In Sects. 3 and 4, we reconstruct the different *f*(*T*) gravity models, i.e., we find an unknown function *f*(*T*) corresponding to the ECHDE and ECNADE models in the power-law and logarithmic versions, respectively, and analyze the EoS parameter for the corresponding models. Karami et al. [59] also investigated the modified teleparallel gravity models as an alternative for holographic and new agegraphic dark energy models. In Sect. 5, we provide the analysis and comparison of the reconstructed models. Section 6 is devoted to our conclusions.

## 2 The brief idea of *f*(*T*) gravity and ECHDE in power-law and logarithmic correction

*T*to a function \(f(T)=T+g(T)\), which is the same as the generalization of the Ricci scalar in Einstein–Hilbert action to the modified

*f*(

*R*) gravity. We can write the action of

*f*(

*T*) gravity, coupled with matter, \(L_{m}\), by [61, 62, 63, 64, 65]

*T*, known as the torsion scalar, is defined as follows:

*g*with respect to

*T*. Here \(\Upsilon _{\rho \nu }\) is the stress tensor. Now we assume the usual spatially flat metric of the Friedmann–Robertson–Walker (FRW) universe giving the line element written as

*a*(

*t*) is the scalar factor, a function of the cosmic time

*t*. Moreover, we consider the background to be a perfect fluid. Using the FRW metric and the perfect fluid matter in the Lagrangian (5) and the field equation (9), we obtain

*p*are the energy density and pressure of ordinary matter content of the universe, respectively. The Hubble parameter (

*H*) is defined as \(H=\frac{\dot{a}}{a}\), where the “dot” denotes the derivative with respect to the cosmic time. Equation (11) shows that \(T<0\).

*z*as

For a given *a*(*t*), with the help of Eqs. (12) and (13) one can reconstruct the *f*(*T*) gravity according to any DE model given by the EoS \(p_{\Lambda }=p_{\Lambda }(\rho _{\Lambda })\), i.e., \(\rho _{\Lambda }=\rho _{\Lambda }(a)\). There are two classes of scale factors which one usually considers for describing the accelerating universe in *f*(*R*), *f*(*T*), etc.

*Class I*The first class of scale factor is given by [66],

*n*are constants and \(t_{s}\) defines the future singularity time. Hence,

*Class II*For the second class of scale factor defined as [66],

*f*(

*T*) gravities according to the ECHDE and ECNADE models in power-law and logarithmic versions.

## 3 *f*(*T*) reconstruction from ECHDE in a power-law and a logarithmic correction models

### 3.1 ECHDE in power-law correction

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 1–6, we understand that \(f(T)\nrightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (26). We also observe that

*f*(

*T*) first decreases and then increases as

*T*increases keeping in mind that

*f*(

*T*) takes always a negative value for all values of negative

*T*. Substituting Eq. (26) into (13) and using (25) we obtain the EoS parameter of the ECHDE

*f*(

*T*) gravity in a power-law correction model as \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 1–6, we see that the EoS parameter can justify the transition from the quintessence state, \(w_{\Lambda }>-1\), to the phantom regime, \(w_{\Lambda }<-1\), i.e., it crosses the phantom divide line \(w_{\Lambda }=-1\) if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21), respectively. So in this case,

*f*(

*T*) gravity generates phantom crossing.

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 1–6, we understand that \(f(T)\nrightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (29). We also observe that

*f*(

*T*) first increases and then decreases as

*T*increases keeping in mind that

*f*(

*T*) takes always positive value for all values of negative

*T*. It may be stated that the solutions obtained in Eqs. (26) and (29) are not very realistic models. Substituting Eq. (29) into (13) and using (28) we obtain the EoS parameter of the ECHDE

*f*(

*T*) gravity in a power-law correction model as \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 1–6, we see that the EoS parameter wholly lies in the phantom region, i.e., \(w_{\Lambda }<-1\) always if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21) respectively. So in this case,

*f*(

*T*) gravity does not generate phantom crossing.

### 3.2 ECHDE in logarithmic correction

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 7–12, we understand that \(f(T)\nrightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (32). We also observe that

*f*(

*T*) first increases and then decreases as

*T*increases keeping in mind that

*f*(

*T*) takes always a negative value for all values of negative

*T*. Substituting Eq. (32) into Eq. (13) and using (31) we obtain the EoS parameter of the ECHDE

*f*(

*T*) gravity model in a logarithmic version as \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 7–12, we see that the EoS parameter can justify the transition from the phantom state, \(w_{\Lambda }<-1\), to the quintessence regime, \(w_{\Lambda }>-1\), i.e., it crosses the phantom divide line \(w_{\Lambda }=-1\) if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21) respectively. So in this case,

*f*(

*T*) gravity generates phantom crossing.

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 7–12, we understand that \(f(T)\nrightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (34). We also observe that

*f*(

*T*) decreases from some positive value to negative value as

*T*increases from negative value to zero. It may be stated that the solutions obtained in Eqs. (32) and (34) are not so-realistic models. Substituting Eq. (34) into (13) and using (33) we obtain the EoS parameter of ECHDE

*f*(

*T*) gravity model in logarithmic version as \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 7–12, we see that the EoS parameter can justify the transition from the quintessence state, \(w_{\Lambda }>-1\), to the phantom regime, \(w_{\Lambda }<-1\), i.e., it crosses the phantom divide line \(w_{\Lambda }=-1\) if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21), respectively, i.e., it crosses the line \(w_{\Lambda }=-1\).

## 4 *f*(*T*) reconstruction from ECNADE model in power-law and logarithmic corrections models

### 4.1 ECNADE in power-law correction

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 13–18, we understand that \(f(T)\nrightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (39). The function

*f*(

*T*) decreases as

*T*increases to zero. Substituting Eq. (39) into (13) and using (38) we obtain the EoS parameter of the ECNADE

*f*(

*T*) gravity model in a power-law version as \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 13–18, we see that the EoS parameter can justify the transition from the phantom state, \(w_{\Lambda }<-1\), to the quintessence regime, \(w_{\Lambda }>-1\), i.e., it crosses the phantom divide line \(w_{\Lambda }=-1\) if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21) respectively i.e., it crosses the line \(w_{\Lambda }=-1\).

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 13–18, we understand that \(f(T)\nrightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (42). The function

*f*(

*T*) decreases but keeps a negative value as

*T*increases to zero. It may be stated that the solutions obtained in Eqs. (39) and (42) both are not realistic models. Substituting Eq. (42) into (13) and using (41) we obtain the EoS parameter of the ECNADE

*f*(

*T*) gravity model in a power-law version, \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 13–18, we see that the EoS parameter entirely lies in the phantom region, \(w_{\Lambda }<-1\) if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21), respectively. So in this case,

*f*(

*T*) gravity generates phantom crossing, i.e., it does not cross the line \(w_{\Lambda }=-1\).

### 4.2 ECNADE in logarithmic correction

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 19–24, we understand that \(f(T)\rightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (45). The function

*f*(

*T*) increases but keeps a negative value as

*T*increases to zero. Substituting Eq. (45) into (13) and using (44) we obtain the EoS parameter of the ECNADE

*f*(

*T*) gravity model in a logarithmic version as \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 19–24, we see that the EoS parameter can justify the transition from the quintessence state, \(w_{\Lambda }>-1\), to the phantom regime, \(w_{\Lambda }<-1\), i.e., it crosses the phantom divide line \(w_{\Lambda }=-1\) if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21), respectively, i.e., it crosses the line \(w_{\Lambda }=-1\).

*c*is the integration constant to be determined from the necessary boundary condition. In Fig. 19–24, we understand that \(f(T)\rightarrow 0\) as \(T\rightarrow 0\) for the solution obtained from Eq. (47). The function

*f*(

*T*) decreases from some positive value to some negative value as

*T*increases up to a certain negative value and after that

*f*(

*T*) increases, keeping a negative sign. It may be stated that the solutions obtained in Eqs. (45) and (47) are both realistic models. Substituting Eq. (47) into (13) and using (46) we obtain the EoS parameter of the ECNADE

*f*(

*T*) gravity model in a logarithmic version as \(w_{\Lambda }=\frac{p_{\Lambda }}{\rho _{\Lambda }}\) graphically. In Fig. 19–24, we see that the EoS parameter can justify the transition from the quintessence state, \(w_{\Lambda }>-1\), to the phantom regime, \(w_{\Lambda }<-1\), i.e., it crosses the phantom divide line \(w_{\Lambda }=-1\) if we draw the graph of the EoS parameter with

*T*and

*z*using Eq. (21), respectively, i.e., it crosses the line \(w_{\Lambda }=-1\).

## 5 Analysis and comparison of the reconstructed models

*f*(

*T*) in a power-law and a logarithmic correction model and ECNADE

*f*(

*T*) in a power-law and a logarithmic correction model, named the squared speed of sound \(v_{s}^{2}\):

### 5.1 Investigation of stability of ECHDE in power-law and logarithmic corrections

For an ECHDE *f*(*T*) model in a power-law version there are two cases. For the first class (class I scale factor) we see from Fig. 25–32 that \(v_{s}^{2}>0\) for \(T \preceq -2\) and \(v_{s}^{2}<0\) for \(T \succeq -2\) and from 27 that \(v_{s}^{2}<0\) for \(z \preceq 0.1\) and \(v_{s}^{2}>0\) for \(z \succeq 0.1\) and for the second class (class II scale factor) we see from Fig. 25–32 that \(v_{s}^{2}<0\) for the present and future epoch. So we can conclude that the ECHDE *f*(*T*) model in a power-law version implies a classical stability for \(T \preceq -2\), \(z \succeq 0.1\) and a classical instability for \(T \succeq -2\), \(z \preceq 0.1\) for the first class and a classical instability of the second class of a given perturbation in general relativity.

For ECHDE *f*(*T*) model in a logarithmic version there are two cases. For the first class (class I scale factor) we see from Fig. 25–32 that \(v_{s}^{2}<0\) for the present and future epoch and for the second class (class II scale factor) we see from Fig. 25–32 that \(v_{s}^{2}<0\) also for the present and future and future epoch. So we can conclude that the ECHDE *f*(*T*) model in a logarithmic version implies a classical instability of a given perturbation in general relativity both for the first and second classes.

### 5.2 Investigation of stability of ECNADE in power-law and logarithmic corrections

*f*(

*T*) model in a power-law version there are also two cases. For the first class (class I scale factor) we see from Fig. 33–40 that \(v_{s}^{2}>0\) for the present and future epoch and for the second class (class II scale factor) we see from Fig. 33–40 that \(v_{s}^{2}<0\) for the present and future epoch. So we can conclude that the ECNADE

*f*(

*T*) model in a power-law version implies a classical stability for the first class and a classical instability of the second class of a given perturbation in general relativity.

For the ECNADE *f*(*T*) model in a logarithmic version there are also two cases. For the first class (class I scale factor) we see from Fig. 33–40 that \(v_{s}^{2}>0\) for the present and future epoch and for the second class (class II scale factor) we see from Fig. 33–40 that \(v_{s}^{2}>0\) . So we can conclude that the ECNADE *f*(*T*) model in a logarithmic version implies a classical stability both for the first and second classes.

## 6 Concluding remarks

In this work, we have assumed the *f*(*T*) modified gravity theory in the background of a flat FRW universe. We found the modified Friedmann equations and then, from the equations, we found the effective energy density and pressure for *f*(*T*) modified gravity theory. Modified gravity gives a natural unification of the early-time inflation and late-time acceleration. We have assumed two types of power-law forms of scale factor, the first class (class I) has a future singularity and the second class (class II) has an initial singularity. In the framework of an *f*(*T*) modified gravity model, four types of dark energy have been considered: (1) the entropy-corrected holographic dark energy (ECHDE) in power-law version, (2) the entropy-corrected holographic dark energy (ECHDE) in logarithmic version, (3) the entropy-corrected new agegraphic dark energy (ECNADE) in a power-law version, and (4) the entropy-corrected new agegraphic dark energy (ECNADE) in a logarithmic version, where \(R_{h}\) is assumed to be the future event horizon and \(\eta \) is assumed to be conformal time. Using the two classes of scale factors, the unknown function *f*(*T*) has been found in terms of *T* for the ECHDE and ECNADE models in power-law and logarithmic versions. The corresponding equation of states have also been generated. For the cases of ECHDE and ECNADE in power-law and logarithmic versions the natures of *f*(*T*) vs. *T* are shown in Figs. 1–6, 7–12, 13–18 and 19–24. For the cases of ECHDE in a power-law version (class I) and logarithmic version (class I and II), ECNADE in a power-law version (class I) and logarithmic version (class I and II), the equation of state parameter \(w_{\Lambda }\) is shown in Figs. 1–6, 7–12, 13–18 and 19–24, whereas in Figs. 1–6 and 19–24, the EoS parameter is divergent at \(T=-1,-10\), \(z=0,25\); \(T=-4\), \(z=-6\), and at \(T=-2\), \(z=13.5\). For the cases of ECHDE in a power-law version (class II) and ECNADE in a power-law version (class II) the equation of state parameter \(w_{\Lambda }\) is shown in Figs. 1–6 and 13–18. From the figures we see that these models lie entirely in the phantom region. It should be mentioned that Karami et al. [59] have investigated the *f*(*T*) reconstructions for the HDE, NADE models, and logarithmic versions of the ECHDE, ECNADE models only, and for these models we got the similar expressions of *f*(*T*) but we have in detail studied the results graphically. To examine the stability test for all the reconstructing models, we have investigated the signs of the square of the velocity of sound. For ECHDE model in a power-law version , we have concluded from Fig. 25–32, that the corresponding model is a classical stable for \(T \le -2\), \(z \ge 0.1\), and classically unstable for \(T \ge -2\), \(z \le 0.1\) for the first class and from Fig. 25–32 the corresponding model is a classically unstable for second class of a given perturbation in general relativity. For the ECHDE model in a logarithmic version, we have concluded from Fig. 25–32 that the corresponding models are unstable both for class I and class II. On the other hand, for the ECNADE model in a power-law version (class I), we have seen from Fig. 33–40 that the corresponding model is stable and for the ECNADE model in a power-law version (class II) we have seen from Fig. 33–40 that the corresponding model is unstable. Again for ECNADE in a logarithmic version (class I and II), we have seen from Fig. 33–40 that the corresponding models are stable. Thus we may conclude that our reconstructed ECHDE model (class I), ECNADE model in a power-law version (class I) and logarithmic version (class I and II) are more realistic (and classically stable) than the other models (classically unstable) discussed.

## Notes

### Acknowledgments

One of the authors (UD) is thankful to IUCAA, Pune, India, where part of the work was carried out, for warm hospitality.

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