# Thermal interpretation of infrared dynamics in de Sitter

@article{Rigopoulos2016ThermalIO, title={Thermal interpretation of infrared dynamics in de Sitter}, author={Gerasimos I Rigopoulos}, journal={Journal of Cosmology and Astroparticle Physics}, year={2016}, volume={2016}, pages={035 - 035} }

The infrared dynamics of a light, minimally coupled scalar field in de Sitter spacetime with Ricci curvature R = 12H2, averaged over horizon sized regions of physical volume VH = (4π/3)(1/H)3, can be interpreted as Brownian motion in a medium with de Sitter temperature TDS = ℏH/2π. We demonstrate this by directly deriving the effective action of scalar field fluctuations with wavelengths larger than the de Sitter curvature radius and generalizing Starobinsky's seminal results on stochastic…

## 26 Citations

### Effective long wavelength scalar dynamics in de Sitter

- Physics
- 2016

We discuss the effective infrared theory governing a light scalar's long wavelength dynamics in de Sitter spacetime. We show how the separation of scales around the physical curvature radius k/a ∼ H…

### De Sitter stability and coarse graining

- PhysicsThe European physical journal. C, Particles and fields
- 2018

A 4-dimensional back reaction analysis of de Sitter space for a conformally coupled scalar field in the presence of vacuum energy initialized in the Bunch–Davies vacuum admits a thermodynamic interpretation which provides a simple alternate derivation of the mechanism.

### Functional renormalization group for stochastic inflation

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2018

We apply the functional renormalization group to Starobinsky's stochastic equation describing the local dynamics of a light scalar field in de Sitter. After elaborating on the over-damped regime of…

### Second-order stochastic theory for self-interacting scalar fields in de Sitter spacetime

- Physics
- 2022

We introduce a second-order stochastic eﬀective theory for light scalar ﬁelds in de Sitter spacetime, extending the validity of the stochastic approach beyond the massless limit and demonstrating how…

### Unequal time correlators of stochastic scalar fields in de Sitter space

- PhysicsPhysical Review D
- 2020

The quantum fluctuations of a test scalar field on superhorizon scale in de Sitter spacetime can be described by an effective one-dimensional stochastic theory corresponding to a particular class of…

### Scalar correlation functions for a double-well potential in de Sitter space

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2020

We use {the spectral representation of }the stochastic Starobinsky-Yokoyama approach to compute correlation functions in de Sitter space for a scalar field with a symmetric or asymmetric double-well…

### Massive scalar field evolution in de Sitter

- Physics
- 2016

A bstractThe behaviour of a massive, non-interacting and non-minimally coupled quantised scalar field in an expanding de Sitter background is investigated by solving the field evolution for an…

### Conformal vacuum and the fluctuation-dissipation theorem in a de Sitter universe and black hole spacetimes

- PhysicsPhysical Review D
- 2019

In the studies of quantum field theory in curved spacetime, the ambiguous concept of vacuum state and the particle content is a long-standing debatable aspect. So far it is well known to us that in…

### Quantum effects of mass on scalar field correlations, power spectrum, and fluctuations during inflation

- PhysicsPhysical Review D
- 2018

We consider an infrared truncated massive minimally coupled scalar field with a quartic self-interaction in the locally de Sitter background of an inflating universe. We compute the two-point…

### Fluctuation-dissipation relation in accelerated frames

- Physics
- 2018

An uniformly accelerated (Rindler) observer will detect particles in the Minkowski vacuum, known as Unruh effect. The spectrum is thermal and the temperature is given by that of the Killing horizon,…

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