TY  - GEN
EP  - 9
Y1  - 2021/06//
AV  - public
SP  - 1
TI  - Facebook?s Cyber?Cyber and Cyber?Physical Digital Twins
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
PB  - Association for Computing Machinery (ACM)
UR  - https://doi.org/10.1145/3463274.3463275
ID  - discovery10139789
N2  - A cyber-cyber digital twin is a simulation of a software system. By contrast, a cyber-physical digital twin is a simulation of a non-software (physical) system. Although cyber-physical digital twins have received a lot of recent attention, their cyber-cyber counterparts have been comparatively overlooked. In this paper we show how the unique properties of cyber-cyber digital twins open up exciting opportunities for research and development. Like all digital twins, the cyber-cyber digital twin is both informed by and informs the behaviour of the twin it simulates. It is therefore a software system that simulates another software system, making it conceptually truly a twin, blurring the distinction between the simulated and the simulator. Cyber-cyber digital twins can be twins of other cyber-cyber digital twins, leading to a hierarchy of twins. As we shall see, these apparently philosophical observations have practical ramifications for the design, implementation and deployment of digital twins at Facebook.
A1  - Ahlgren, J
A1  - Bojarczuk, K
A1  - Drossopoulou, S
A1  - Dvortsova, I
A1  - George, J
A1  - Gucevska, N
A1  - Harman, M
A1  - Lomeli, M
A1  - Lucas, SMM
A1  - Meijer, E
A1  - Omohundro, S
A1  - Rojas, R
A1  - Sapora, S
A1  - Zhou, N
ER  -