NDLI: Dark energy from instantons

Content Provider	Springer Nature Link
Author	Marochnik, Leonid
Copyright Year	2013
Abstract	We show that in imaginary time quantum metric fluctuations of empty space form a self-consistent de Sitter gravitational instanton that can be thought of as describing tunneling from “nothing” into de Sitter space of real time (no cosmological constant or scalar fields are needed). For the first time, this mechanism is activated to give birth to a flat inflationary Universe. For the second time, it is turned on to complete the cosmological evolution after the energy density of matter drops below the threshold (the energy density of instantons). A cosmological expansion with dark energy takes over after the scale factor exceeds this threshold, which marks the birth of dark energy at a redshift 1 + z ≈ 1.3 and provides a possible solution to the “coincidence problem”. The number of gravitons which tunneled into the Universe must be of the order of 10$^{122}$ to create the observed value of the Hubble constant. This number has nothing to do with vacuum energy, which is a possible solution to the “old cosmological constant problem”. The emptying Universe should possibly complete its evolution by tunneling back to “nothing”. After that, the entire scenario is repeated, and it can happen endlessly.
Starting Page	178
Ending Page	187
Page Count	10
File Format	PDF
ISSN	02022893
Journal	Gravitation and Cosmology
Volume Number	19
Issue Number	3
e-ISSN	19950721
Language	English
Publisher	Springer US
Publisher Date	2013-08-29
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Classical and Quantum Gravitation, Relativity Theory Astronomy, Observations and Techniques Astrophysics and Astroparticles Quantum Physics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics

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