Back-reaction of perturbations in two scalar field inflationary models
By G. Geshnizjani, Robert Brandenberger. 2003
139 citations recorded by the source corpus.
We calculate the back-reaction of long wavelength cosmological perturbations on a general relativistic measure of the local expansion rate of the universe. Specifically, we consider a cosmological model in which matter is described by two scalar matter fields, one being the inflaton and the other one representing a matter field which is used as a clock. We analyse back-reaction in a phase of inflaton-driven slow-roll inflation, and find that the leading infrared back-reaction terms contributing to the evolution of the expansion rate do not vanish when measured at a fixed value of the clock field. We also analyse the back-reaction of entropy modes in a specific cosmological model with negative square mass for the entropy field and find that back-reaction can become significant. Our work provides evidence that, in general, the back-reaction of infrared fluctuations could be locally observable.
Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/3776fa131385ea5881c4175a3b122849825f9e3e
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
- Robert Brandenberger
- Jérôme Martin
- Stefan Nobbenhuis
- Yi-Fu Cai
- P. Peter
- U. Danielsson
- Yi Wang
- D. Mattingly
In Statistical and Nonlinear Physics
- Robert Brandenberger
- Jérôme Martin
- Stefan Nobbenhuis
- U. Danielsson
- P. Peter
- Yi-Fu Cai
- Yi Wang
- Sabine Hossenfelder
Citations in the corpus
- Categorizing Different Approaches to the Cosmological Constant Problem (2004, background): “Brandenberger and co-workers have subsequently tried to improve their analysis by identifying a local physical variable which describes the expansion rate [68, 69].”
- Trans-Planckian issues for inflationary cosmology (2012, background): “However, in the presence of multi-field systems with entropy fluctuations, it can be shown that the leading IR back-reaction effects are physically measurable [128] (see also [129]).”
- Dark energy from backreaction (2003, unknown): “-k”