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Keywords = Jackiw-Teitelboim gravity

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18 pages, 1986 KiB  
Article
Trapped Gravitational Waves in Jackiw–Teitelboim Gravity
by Jeong-Myeong Bae, Ido Ben-Dayan, Marcelo Schiffer, Gibum Yun and Heeseung Zoe
Universe 2021, 7(2), 40; https://doi.org/10.3390/universe7020040 - 7 Feb 2021
Viewed by 2020
Abstract
We discuss the possibility that gravitational fluctuations (“gravitational-waves”) are trapped in space by gravitational interactions in two dimensional Jackiw–Teitelboim gravity. In the standard geon (gravitational electromagnetic entity) approach, the effective energy is entirely deposited in a thin layer, the active region, that achieves [...] Read more.
We discuss the possibility that gravitational fluctuations (“gravitational-waves”) are trapped in space by gravitational interactions in two dimensional Jackiw–Teitelboim gravity. In the standard geon (gravitational electromagnetic entity) approach, the effective energy is entirely deposited in a thin layer, the active region, that achieves spatial self-confinement and raises doubts about the geon’s stability. In this paper we relinquish the “active region” approach and obtain self-confinement of “gravitational waves” that are trapped by the vacuum geometry and can be stable against the backreaction due to metric fluctuations. Full article
(This article belongs to the Section Gravitation)
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17 pages, 1141 KiB  
Article
Gas of Baby Universes in JT Gravity and Matrix Models
by Irina Aref’eva and Igor Volovich
Symmetry 2020, 12(6), 975; https://doi.org/10.3390/sym12060975 - 8 Jun 2020
Cited by 11 | Viewed by 2814
Abstract
It has been shown recently by Saad, Shenker and Stanford that the genus expansion of a certain matrix integral generates partition functions of Jackiw-Teitelboim (JT) quantum gravity on Riemann surfaces of arbitrary genus with any fixed number of boundaries. We use an extension [...] Read more.
It has been shown recently by Saad, Shenker and Stanford that the genus expansion of a certain matrix integral generates partition functions of Jackiw-Teitelboim (JT) quantum gravity on Riemann surfaces of arbitrary genus with any fixed number of boundaries. We use an extension of this integral for studying gas of baby universes or wormholes in JT gravity. To investigate the gas nonperturbatively we explore the generating functional of baby universes in the matrix model. The simple particular case when the matrix integral includes the exponential potential is discussed in some detail. We argue that there is a phase transition in the gas of baby universes. Full article
(This article belongs to the Special Issue Selected Papers: 10th Mathematical Physics Meeting)
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