# Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe

## Abstract

We propose a phenomenological model for the early universe where there is a smooth transition between an early quintessence phase and a radiation-dominated era. The matter content is modeled by an appropriately modified Chaplygin gas for the early universe. We constrain the model observationally by mapping the primordial power spectrum of the scalar perturbations to the latest data of WMAP7. We compute as well the spectrum of the primordial gravitational waves as would be measured today. We show that the high frequencies region of the spectrum depends on the free parameter of the model and most importantly this region of the spectrum can be within the reach of future gravitational waves detectors.

- Authors:

- Publication Date:

- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC)

- OSTI Identifier:
- 1042669

- Report Number(s):
- SLAC-PUB-15063

Journal ID: ISSN 1550-7998; arXiv:1104.0676; TRN: US201212%%873

- DOE Contract Number:
- AC02-76SF00515

- Resource Type:
- Journal Article

- Journal Name:
- Phys.Rev.D84:023505,2011

- Additional Journal Information:
- Journal Volume: 84; Journal Issue: 2; Journal ID: ISSN 1550-7998

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; GRAVITATIONAL WAVES; SCALARS; UNIVERSE; Astrophysics, Gravitation and Cosmology,ASTRO

### Citation Formats

```
Bouhmadi-Lopez, Mariam, /Lisbon, CENTRA, Chen, Pisin, /Taiwan, Natl. Taiwan U. /KIPAC, Menlo Park /SLAC, Liu, Yen-Wei, and /Taiwan, Natl. Taiwan U.
```*Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe*. United States: N. p., 2012.
Web.

```
Bouhmadi-Lopez, Mariam, /Lisbon, CENTRA, Chen, Pisin, /Taiwan, Natl. Taiwan U. /KIPAC, Menlo Park /SLAC, Liu, Yen-Wei, & /Taiwan, Natl. Taiwan U.
```*Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe*. United States.

```
Bouhmadi-Lopez, Mariam, /Lisbon, CENTRA, Chen, Pisin, /Taiwan, Natl. Taiwan U. /KIPAC, Menlo Park /SLAC, Liu, Yen-Wei, and /Taiwan, Natl. Taiwan U. Wed .
"Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe". United States. https://www.osti.gov/servlets/purl/1042669.
```

```
@article{osti_1042669,
```

title = {Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe},

author = {Bouhmadi-Lopez, Mariam and /Lisbon, CENTRA and Chen, Pisin and /Taiwan, Natl. Taiwan U. /KIPAC, Menlo Park /SLAC and Liu, Yen-Wei and /Taiwan, Natl. Taiwan U.},

abstractNote = {We propose a phenomenological model for the early universe where there is a smooth transition between an early quintessence phase and a radiation-dominated era. The matter content is modeled by an appropriately modified Chaplygin gas for the early universe. We constrain the model observationally by mapping the primordial power spectrum of the scalar perturbations to the latest data of WMAP7. We compute as well the spectrum of the primordial gravitational waves as would be measured today. We show that the high frequencies region of the spectrum depends on the free parameter of the model and most importantly this region of the spectrum can be within the reach of future gravitational waves detectors.},

doi = {},

journal = {Phys.Rev.D84:023505,2011},

issn = {1550-7998},

number = 2,

volume = 84,

place = {United States},

year = {2012},

month = {6}

}

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