# Non-minimally coupled tachyon field in teleparallel gravity

## Abstract

We perform a full investigation on dynamics of a new dark energy model in which the four-derivative of a non-canonical scalar field (tachyon) is non-minimally coupled to the vector torsion. Our analysis is done in the framework of teleparallel equivalent of general relativity which is based on torsion instead of curvature. We show that in our model there exists a late-time scaling attractor (point P{sub 4}), corresponding to an accelerating universe with the property that dark energy and dark matter densities are of the same order. Such a point can help to alleviate the cosmological coincidence problem. Existence of this point is the most significant difference between our model and another model in which a canonical scalar field (quintessence) is used instead of tachyon field.

- Authors:

- Department of Physics, Babol Branch, Islamic Azad University, Shariati Street, Babol (Iran, Islamic Republic of)
- Department of Basic Sciences, Babol University of Technology, Shariati Street, Babol (Iran, Islamic Republic of)

- Publication Date:

- OSTI Identifier:
- 22525886

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; GENERAL RELATIVITY THEORY; GRAVITATION; NONLUMINOUS MATTER; SCALAR FIELDS; TACHYONS; TORSION; UNIVERSE; VECTORS

### Citation Formats

```
Fazlpour, Behnaz, and Banijamali, Ali, E-mail: b.fazlpour@umz.ac.ir, E-mail: a.banijamali@nit.ac.ir.
```*Non-minimally coupled tachyon field in teleparallel gravity*. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/04/030.

```
Fazlpour, Behnaz, & Banijamali, Ali, E-mail: b.fazlpour@umz.ac.ir, E-mail: a.banijamali@nit.ac.ir.
```*Non-minimally coupled tachyon field in teleparallel gravity*. United States. doi:10.1088/1475-7516/2015/04/030.

```
Fazlpour, Behnaz, and Banijamali, Ali, E-mail: b.fazlpour@umz.ac.ir, E-mail: a.banijamali@nit.ac.ir. Wed .
"Non-minimally coupled tachyon field in teleparallel gravity". United States.
doi:10.1088/1475-7516/2015/04/030.
```

```
@article{osti_22525886,
```

title = {Non-minimally coupled tachyon field in teleparallel gravity},

author = {Fazlpour, Behnaz and Banijamali, Ali, E-mail: b.fazlpour@umz.ac.ir, E-mail: a.banijamali@nit.ac.ir},

abstractNote = {We perform a full investigation on dynamics of a new dark energy model in which the four-derivative of a non-canonical scalar field (tachyon) is non-minimally coupled to the vector torsion. Our analysis is done in the framework of teleparallel equivalent of general relativity which is based on torsion instead of curvature. We show that in our model there exists a late-time scaling attractor (point P{sub 4}), corresponding to an accelerating universe with the property that dark energy and dark matter densities are of the same order. Such a point can help to alleviate the cosmological coincidence problem. Existence of this point is the most significant difference between our model and another model in which a canonical scalar field (quintessence) is used instead of tachyon field.},

doi = {10.1088/1475-7516/2015/04/030},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 04,

volume = 2015,

place = {United States},

year = {Wed Apr 01 00:00:00 EDT 2015},

month = {Wed Apr 01 00:00:00 EDT 2015}

}