## 94 Citations

### Kinematical and dynamical aspects of ghost-matter cosmologies

- PhysicsClassical and Quantum Gravity
- 2020

We consider the kinematical and dynamical evolution of Friedmann Universes with a mixture of non-interacting matter and a ghost-like field, in a scenario analogous to that advocated by the Quintom…

### A Cyclic Cosmology

- Physics
- 2009

LAURIS M. BAUM: A Cyclic Cosmology (Under the direction of Professor Paul H. Frampton) It is speculated how dark energy in a braneworld can help reconcile an infinitely cyclic cosmology with the…

### Generating curvature perturbations in a contracting universe

- Physics
- 2017

This thesis studies bouncing cosmologies in which the present-day expansion of the universe was preceded not by a “big bang”– before which time and space ceased to have meaning– but by a contracting…

### Cosmological time crystal: Cyclic universe with a small cosmological constant in a toy model approach

- PhysicsPhysical Review D
- 2018

A new form Time Crystal has been proposed and some of its consequences have been studied. The model is a generalization of the Friedmann-Robertson-Walker (FRW) cosmology endowed with noncommutative…

### Dynamical Analysis of an n−H−T Cosmological Quintessence Real Gas Model with a General Equation of State

- Physics
- 2018

The cosmological dynamics of a quintessence model based on real gas with general equation of state is presented within the framework of a three-dimensional dynamical system describing the time…

### Nonlinear vector perturbations in a contracting universe

- Physics
- 2007

A number of scalar field models proposed as alternatives to the standard inflationary scenario involve contracting phases which precede the universe's present phase of expansion. An important…

### Cyclic universes & direct detection of cosmic expansion by holonomy in the McVittie spacetime

- Physics
- 2019

This dissertation consists of two parts. They are separate ideas, but both fall into the context of General Relativity using dynamical systems. Part one is titled Cyclic Universes. It is shown that a…

### Notes on the post-bounce background dynamics in bouncing cosmologies

- PhysicsJournal of High Energy Physics
- 2021

Abstract
We investigate the post-bounce background dynamics in a certain class of single bounce scenarios studied in the literature, in which the cosmic bounce is driven by a scalar field with…

### J un 2 00 8 Ekpyrotic and Cyclic Cosmology

- Physics
- 2009

Ekpyrotic and cyclic cosmologies provide theories of the very early and of the very late universe. In these models, the big bang is described as a collision of branes and thus the big bang is not the…

## References

SHOWING 1-10 OF 64 REFERENCES

### Kasner and mixmaster behavior in universes with equation of state w >= 1

- Physics
- 2004

We consider cosmological models with a scalar field with equation of state $w\ge 1$ that contract towards a big crunch singularity, as in recent cyclic and ekpyrotic scenarios. We show that chaotic…

### Nonsingular perturbations in a bouncing brane model

- Physics
- 2004

The question of how perturbations evolve through a bounce in the Cyclic and Ekpyrotic models of the Universe remains a topical one. Issues concerning singularities at the background level and at the…

### Conditions for generating scale-invariant density perturbations

- Physics
- 2004

We analyze the general conditions on the equation of state $w$ required for quantum fluctuations of a scalar field to produce a scale-invariant spectrum of density perturbations, including models…

### Cosmological perturbations in a big-crunch-big-bang space-time

- Physics
- 2004

A prescription is developed for matching general relativistic perturbations across singularities of the type encountered in the ekpyrotic and cyclic scenarios, i.e., a collision between orbifold…

### A Cyclic Model of the Universe

- PhysicsScience
- 2002

A cosmological model in which the universe undergoes an endless sequence of cosmic epochs that begin with a "bang" and end in a “crunch" is proposed, which produces the homogeneity, flatness, and energy needed to begin the next cycle.

### Passing through the bounce in the ekpyrotic models

- Physics
- 2002

By considering a simplified but exact model for realizing the ekpyrotic scenario, we clarify various assumptions that have been used in the literature. In particular, we discuss the new ekpyrotic…

### From big crunch to big bang

- Physics
- 2002

We consider conditions under which a universe contracting towards a big crunch can make a transition to an expanding big bang universe. A promising example is 11-dimensional M-theory in which the…

### Inflationary universe: A possible solution to the horizon and flatness problems

- Physics
- 1981

The standard model of hot big-bang cosmology requires initial conditions which are problematic in two ways: (1) The early universe is assumed to be highly homogeneous, in spite of the fact that…

### Density perturbations in the ekpyrotic scenario

- Physics
- 2002

We study the generation of density perturbations in the ekpyrotic scenario for the early universe, including gravitational backreaction. We expose interesting subtleties that apply to both…