Implications of a positive cosmological constant for general relativity

Ashtekar, Abhay

doi:10.1088/1361-6633/aa7bb1

Implications of a positive cosmological constant for general relativity

Abhay Ashtekar
(
- Penn State U., University Park, IGC and
- Marseille, CPT
)

Jun 22, 2017

8 pages

Published in:

Rept.Prog.Phys. 80 (2017) 10, 102901

Published: Aug 29, 2017

e-Print:

1706.07482 [gr-qc]

DOI:

10.1088/1361-6633/aa7bb1

View in:

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Abstract: (IOP)

Most of the literature on general relativity over the last century assumes that the cosmological constant

\Lambda

is zero. However, by now independent observations have led to a consensus that the dynamics of the universe is best described by Einstein’s equations with a small but positive

\Lambda

. Interestingly, this requires a drastic revision of conceptual frameworks commonly used in general relativity, no matter how small

\Lambda

is. We first explain why, and then summarize the current status of generalizations of these frameworks to include a positive

\Lambda

, focusing on gravitational waves.

Note:

A Key Issues Review, Commissioned by Rep. Prog. Phys. 12 pages, 3 figures

general relativity
cosmological constant
gravitational radiation
Einstein equation
cosmological model

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