# Constraining a matter-dominated cosmological model with bulk viscosity proportional to the Hubble parameter

@article{Avelino2008ConstrainingAM, title={Constraining a matter-dominated cosmological model with bulk viscosity proportional to the Hubble parameter}, author={A. Avelino and Ulises Nucamendi}, journal={arXiv: General Relativity and Quantum Cosmology}, year={2008} }

We present and constrain a cosmological model where the only component is a pressureless fluid with bulk viscosity as an explanation for the present accelerated expansion of the universe. We study the particular model of a bulk viscosity coefficient proportional to the Hubble parameter. The model is constrained using the SNe Ia Gold 2006 sample, the Cosmic Microwave Background (CMB) shift parameter R, the Baryon Acoustic Oscillation (BAO) peak A and the Second Law of Thermodynamics (SLT). It… Expand

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#### References

SHOWING 1-10 OF 12 REFERENCES

Constraining a bulk viscous matter-dominated cosmological model using SNe Ia, CMB and LSS

- Physics
- 2008

We present and constrain a cosmological model which component is a pressureless fluid with bulk viscosity as an explanation for the present accelerated expansion of the universe. We study the… Expand

XI Mexican Workshop on Particles and Fields. AIP Conf. Proc, AIP 1026

- XI Mexican Workshop on Particles and Fields. AIP Conf. Proc, AIP 1026
- 2008

in XI Mexican Workshop on Particles and Fields

- AIP Conf. Proc, AIP 1026, 300–302, arXiv:0801.1686 [gr-qc],
- 2008

Phys. Rev. D

- Phys. Rev. D
- 2007

Astrophysical Journal 650

- 1–6,
- 2006

Gen. Rel. Grav

- Gen. Rel. Grav
- 2006

Phys. Lett. B

- Phys. Lett. B
- 2006

S

- V. B. Goncalves and R. de Sa Ribeiro, Gen. Rel. Grav 38, 495–506,
- 2006

(SDSS Collaboration) Astrophysical Journal

- (SDSS Collaboration) Astrophysical Journal
- 2005

Phys. Rev. D

- Phys. Rev. D
- 2003