Cosmic Walls and Filaments Formation in Modied Chaplygin Gas Cosmology

Authors

  • H. Razmi Department of Physics, University of Qom, Qom, I. R. Iran;
  • S. Karbasi Department of Physics, University of Qom, Qom, I. R. Iran;
Abstract:

We want to study the perturbation growth of an initial seed of an ellipsoidal shape in Top-Hat collapse model of the structure formation in the Modied Chaplygin gas cosmology. Considering reasonable values of the constants and the parameters of the model under study, we can show that a very small deviation from spherical symmetry (ellipsoidal geometry) in the initial seed leads to a nal highly non-spherical structure which can be considered as a candidate for justifying the already known cosmological structures as cosmic walls and laments.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

New Results in Chaplygin Gas Cosmology

We provide a rigorous derivation of the evolution equation in the context of Chaplygin gas cosmology, in which the relativistic formulation of Chaplygin matter is a crucial ingredient. This is in contrast to the existing literature where the non-relativistic form of the Chaplygin equation of state is naively used in the covariant Einsstein equation. Our results show that the Chaplygin model des...

full text

Chaplygin Gas , Energy Conditions and Cosmology

It is explored that if dominant component of content of the future universe behaves as Chaplygin gas, voilation of other energy conditions (null energy condition, weak energy condition and dominant energy condition) can be avoided if " strong energy condition " is obeyed. In the investigations, here, two cases arise. In one case, universe expands with acceleration leading to finite energy densi...

full text

New Approach to Chaplygin Gas Cosmology

We consider a new approach for Chaplygin cosmology, in which the relativistic formulation of Chaplygin matter is of crucial importance. Our results show that (for all times) the universe consists of a novel form of matter with dust like density (∼ (volume) −1) and negative pressure. This is in contrast to the usual Chaplygin cosmology, based on non-relativistic equation of state, that implies a...

full text

Cosmology with a Variable Chaplygin Gas

We consider a new generalized Chaplygin gas model that includes the original Chaplygin gas model as a special case. In this model the generalized Chaplygin gas evolves as from dust to quiessence or phantom. We show that the model is consistent with current type Ia supernova data for a broad range of parameters. PACS number(s): 98.80.Es, 98.80.Cq ∗e-mail address: [email protected]

full text

Chaplygin Gas Cosmology Predicts Only 'dusty' Universe

We consider a new approach for Chaplygin gas cosmology, in which the relativistic formulation of Chaplygin matter is of crucial importance. Specifically, the dynamical content of this matter induces a generalizd energy conservation principle. Our results show that (for all times) the universe consists of a novel form of matter with dust like density (∼ (volume) −1) and negative pressure, that i...

full text

Detectability of Cosmic Topology in Generalized Chaplygin Gas Models

If the spatial section of the universe is multiply connected, repeated images or patterns are expected to be detected observationally. However, due to the finite distance to the last scattering surface, such pattern repetitions could be unobservable. This raises the question of whether a given cosmic topology is detectable, depending on the values of the parameters of the cosmological model. We...

full text

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


Journal title

volume 2  issue 2

pages  153- 159

publication date 2015-12-01

By following a journal you will be notified via email when a new issue of this journal is published.

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023