# Graviton production in noninflationary cosmology

@article{Durrer2009GravitonPI, title={Graviton production in noninflationary cosmology}, author={Ruth Durrer and Massimiliano Rinaldi}, journal={Physical Review D}, year={2009}, volume={79}, pages={063507} }

We discuss the creation of massless particles in a Universe, which transits from a radiation-dominated era to any other expansion law. We calculate in detail the generation of gravitons during the transition to a matter-dominated era. We show that the resulting gravitons generated in the standard radiation/matter transition are negligible. We use our result to constrain one or more previous matter-dominated era, or any other expansion law, which may have taken place in the early Universe. We…

## 17 Citations

Observational signatures of pre-inflationary and lower-dimensional effective gravity

- Physics
- 2010

Several alternative ways to quantize gravitational interactions seem to indicate that gravity at short distances is effectively two-dimensional. If this were true, and the energy scale at which the…

What the Null Energy Condition Tells us About Gravitational Wave Frequencies in / for Relic Cosmology?

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- 2011

We introduce a criterion as to the range of HFGW generated by early universe conditions. The 1 to 10 Giga Hertz range is constructed initially starting with what Grupen writes as far as what to…

Energy Content of Gravitation as a Way to Quantify Both Entropy and Information Generation in the Early Universe

- Physics
- 2010

Based upon Alcubierre’s formalism about energy flux of gravitational waves, as well as Saunder’s treatment of temperature dependence of the Hubble parameter in the early universe, we initiate a…

How can GW/graviton generation has semi classical features, and what the implications are for cosmological re acceleration of the universe, and initial relic entropy generation in term of the importance of dimensions.

- Physics
- 2009

We argue in this document that initial vacuum state values possibly responsible for GW generation in relic conditions in the initial onset of inflation may have a temporary un squeezed, possibly even…

Can a Massive Graviton be a Stable Particle

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- 2010

This document is based on a question asked in the Dark Side of the Universe 2010 conference in Leon, Mexico, when a researcher from India asked the author about how to obtain a stability analysis of…

What about the inter relation of string theory with counting algorithms for DM and Graviton production , in terms of Entropy ?

- 2009

We argue in this document that initial vacuum state values possibly responsible for GW generation in relic conditions in the initial onset of inflation may have a temporary unsqueezed , possibly even…

Cosmic de Celebration Parameter Q(Z) Dependence Upon Gravitons? Implications for the DM Rocket/ram Jet Model

- Physics
- 2009

In the 12th Marcel Grossmann Meeting, July 9th, 2009, the author raised the issue of whether early graviton production could affect non-Gaussian contributions to DM density profiles. Another issue to…

On infrared and ultraviolet divergences of cosmological perturbations

- Physics
- 2011

We study a consistent infrared and ultraviolet regularization scheme for the cosmological perturbations. The infrared divergences are cured by assuming that the Universe undergoes a transition…

What the Null Energy Condition (and When It May Be Violated) Tells Us about Gravitational Wave Frequencies in/for Relic Cosmology?

- Physics
- 2011

We introduce a criterion as to the range of HFGW generated by early universe conditions. The 1 to 10 Giga Hertz range is constructed initially starting with what Grupen writes as far as what to…

Laser Boost of a Small Interstellar Ram Jet to Obtain Operational Velocity: Implications for the DM Rocket/ram Jet Model

- Physics
- 2009

In other conference research papers, Beckwith obtained a maximum DM mass/energy value of up to 5 TeV, as opposed to 400 GeV for DM, which may mean more convertible power for a dark matter ram jet.…

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