# Questions tagged [de-sitter-spacetime]

The tag has no usage guidance.

110 questions
Filter by
Sorted by
Tagged with
118 views

### de Sitter space vs de Sitter universe

I have heard of the term de Sitter space. From this post user G. Smith writes, De Sitter spacetime is curved; specifically, it has the same positive scalar curvature at every point. Likewise, when I ...
• 5,218
1 vote
58 views

### Positive and negative curvature de Sitter spacetimes

I'm reading Mukhanov's "Physical foundations of cosmology" and in the section on the de Sitter universe, he examines a perfect fluid with pressure $p$ equal to negative of the energy density ...
• 662
44 views

### Double Wick Rotation of de Sitter Metric with Closed Slicing

The de Sitter spacetime (with closed spherically symmetric slicing) has the metric $$\text{d}s^2 = -\text{d}t^2 + \alpha^2\cosh(t/\alpha)^2\text{d}\Omega_{d-1}^2$$ where $\text{d}\Omega_{d-1}^2$ is ...
• 621
52 views

### Negative surface tension of de Sitter event horizon?

Questions – What does a negative surface tension of a de Sitter cosmological event horizon actually mean? Scotch in water, or something else? What does a zero ‘external’ vacuum pressure to the de ...
• 1,085
1 vote
51 views

• 886
347 views

• 802
1 vote
46 views

176 views

### Supersymmetry in de Sitter space

Is it possible to construct SUSY theories in de Sitter space? I know statement: dS superalgebras cannot be constructed unless one constructs actions with matter coupled with the wrong signs for ...
• 5,281
261 views

### Newton's law of gravitation in de Sitter space

Given two masses $M$ and $m$ (with $M\gg m$) in a de Sitter background with cosmological constant $\Lambda>0$ and positive spatial curvature ($k=+1$). What is the corresponding (semiclassical "...
1 vote
149 views

### String Landscape, De Sitter vacua and Broken Supersymmetry

If we assume that the swampland conjectures, etc. regarding de sitter vacuas existence in the string / F-theory landscape turn out to be incorrect (and therefore we can assume the problem is well-...
200 views

### How to pick what coordinates transformations to apply in general relativity?

I've been challenged by coordinate transformations lately, as most of you know during solving any problem in GR we have to go through lots of transformations, my question is how we decide the best ...
• 11
1 vote
61 views

### AdS/CFT phenomenology and realistic FRW model building

Are there any examples of realistic holography (likely as a de Sitter type Universe: as it approximates FRW / is an FRW solution without baryonic and dark matter). I don’t see why one wouldn’t be ...
• 113