## 166 Citations

### On adiabatic perturbations in the ekpyrotic scenario

- Physics
- 2010

In a recent paper, Khoury and Steinhardt proposed a way to generate adiabatic cosmological perturbations with a nearly flat spectrum in a contracting Universe. To produce these perturbations they…

### On adiabatic perturbations in the ekpyrotic scenario

- Physics
- 2009

In a recent paper arXiv:0910.2230, Khoury and Steinhardt proposed a way to generate adiabatic cosmological perturbations with a nearly flat spectrum in a contracting Universe. To produce these…

### Multifield cosmological perturbations at third order and the ekpyrotic trispectrum

- Physics
- 2009

Using the covariant formalism, we derive the equations of motion for adiabatic and entropy perturbations at third order in perturbation theory for cosmological models involving two scalar fields. We…

### Dynamics of cosmological perturbations and reheating in the anamorphic universe

- Physics
- 2017

We discuss scalar-tensor realizations of the Anamorphic cosmological scenario recently proposed by Ijjas and Steinhardt [1]. Through an analysis of the dynamics of cosmological perturbations we…

### Curvature perturbations from ekpyrotic collapse with multiple fields

- Physics
- 2007

A scale-invariant spectrum of isocurvature perturbations is generated during collapse in the ekpyrotic scaling solution in models where multiple fields have steep negative exponential potentials. The…

### Propagation of adiabatic and entropy perturbations in a bouncing universe

- Physics
- 2003

By studying some bouncing universe models dominated by a specific class of hydrodynamical fluids, we show that the primordial cosmological perturbations may propagate smoothly through a general…

### Nonsingular ekpyrotic cosmology with a nearly scale-invariant spectrum of cosmological perturbations and gravitational waves

- PhysicsPhysical Review D
- 2020

We propose a mechanism borrowed from string theory which yields a non-singular transition from a phase of Ekpyrotic contraction to the expanding phase of Standard Big Bang cosmology. The same…

### Ekpyrotic collapse with multiple fields

- Physics
- 2007

A scale-invariant spectrum of isocurvature perturbations is generated during collapse in the scaling solution in models where two or more fields have steep negative exponential potentials. The scale…

## References

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- Physics
- 1982

The spectrum of density perturbations is calculated in the new-inflationary-universe scenario. The main source is the quantum fluctuations of the Higgs field, which lead to fluctuations in the time…

### Large Scale Quantum Fluctuations in the Inflationary Universe

- Physics
- 1986

Quantum fluctuations of an inflation-driving scalar field are evaluated in a way manifestly independent of the choice of coordinate gauge conditions. It is found that the dynamical degree of freedom…

### Metric perturbations in dilaton-driven inflation.

- PhysicsPhysical review. D, Particles and fields
- 1995

The spectrum of scalar and tensor metric perturbations generated during an epoch of dilaton-driven inflation of the type occurring naturally in string cosmology exhibits nearly Planckian spectra, whose common “temperature” is related to some very basic parameters of the string-cosmology background.

### Gauge Invariant Cosmological Perturbations

- Physics
- 1980

The physical interpretation of perturbations of homogeneous, isotropic cosmological models in the early Universe, when the perturbation is larger than the particle horizon, is clarified by defining a…

### Reheating and dangerous relics in pre-big-bang string cosmology

- Physics
- 2000

We discuss the mechanism of reheating in pre-big-bang string cosmology and we calculate the amount of moduli and gravitinos produced gravitationally and in scattering processes of the thermal bath.…

### Cosmological Inflation and Large-Scale Structure

- Physics
- 2000

This textbook is the first to provide a modern and unified overview of inflationary cosmology and carefully compares predictions with the latest observations, including those of the cosmic microwave background, the clustering and velocities of galaxies and the epoch of structure formation.

### Density perturbations in cosmological models

- Physics
- 1976

An explicitly coordinate-independent method, based on previous work by Hawking, is used to study linearized density perturbations of $k=0$ Friedmann cosmological models.

### Phys

- Lett. B274
- 1992