# Conformal invariant cosmological perturbations via the covariant approach

## Abstract

It is known that some cosmological perturbations are conformal invariant. This facilitates the studies of perturbations within some gravitational theories alternative to general relativity, for example the scalar-tensor theory, because it is possible to do equivalent analysis in a certain frame in which the perturbation equations are simpler. In this paper we revisit the problem of conformal invariances of cosmological perturbations in terms of the covariant approach in which the perturbation variables have clear geometric and physical meanings. We show that with this approach the conformal invariant perturbations are easily identified.

- Authors:

- Interdisciplinary Center for Theoretical Study, University of Science and Technology of China, Hefei, Anhui 230026 (China)

- Publication Date:

- OSTI Identifier:
- 22525240

- Resource Type:
- Journal Article

- Journal Name:
- Journal of Cosmology and Astroparticle Physics

- Additional Journal Information:
- Journal Volume: 2015; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CONFORMAL INVARIANCE; COSMOLOGY; DISTURBANCES; GENERAL RELATIVITY THEORY; SCALARS; TENSORS

### Citation Formats

```
Li, Mingzhe, and Mou, Yicen, E-mail: limz@ustc.edu.cn, E-mail: moinch@mail.ustc.edu.cn.
```*Conformal invariant cosmological perturbations via the covariant approach*. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/10/037.

```
Li, Mingzhe, & Mou, Yicen, E-mail: limz@ustc.edu.cn, E-mail: moinch@mail.ustc.edu.cn.
```*Conformal invariant cosmological perturbations via the covariant approach*. United States. doi:10.1088/1475-7516/2015/10/037.

```
Li, Mingzhe, and Mou, Yicen, E-mail: limz@ustc.edu.cn, E-mail: moinch@mail.ustc.edu.cn. Thu .
"Conformal invariant cosmological perturbations via the covariant approach". United States. doi:10.1088/1475-7516/2015/10/037.
```

```
@article{osti_22525240,
```

title = {Conformal invariant cosmological perturbations via the covariant approach},

author = {Li, Mingzhe and Mou, Yicen, E-mail: limz@ustc.edu.cn, E-mail: moinch@mail.ustc.edu.cn},

abstractNote = {It is known that some cosmological perturbations are conformal invariant. This facilitates the studies of perturbations within some gravitational theories alternative to general relativity, for example the scalar-tensor theory, because it is possible to do equivalent analysis in a certain frame in which the perturbation equations are simpler. In this paper we revisit the problem of conformal invariances of cosmological perturbations in terms of the covariant approach in which the perturbation variables have clear geometric and physical meanings. We show that with this approach the conformal invariant perturbations are easily identified.},

doi = {10.1088/1475-7516/2015/10/037},

journal = {Journal of Cosmology and Astroparticle Physics},

issn = {1475-7516},

number = 10,

volume = 2015,

place = {United States},

year = {2015},

month = {10}

}

Other availability

Save to My Library

You must Sign In or Create an Account in order to save documents to your library.