Work

Cosmological time crystal: Cyclic universe with a small cosmological constant in a toy model approach

Year: 2018

Type: article

Abstract: A new form time crystal has been proposed, and some of its consequences have been studied. The model is a generalization of the Friedmann-Robertson-Walker (FRW) cosmology endowed with noncommutative geometry corrections. In the minisuperspace approach, the scale factor undergoes the time periodic behavior, or Sisyphus dynamics, which allows us to interpret this cosmological time crystal as a physically motivated toy model to simulate the cyclic universe. Analyzing our model purely from the time crystal perspective reveals many novelties such as a complex singularity structure (more complicated than the previously encountered swallowtail catastrophe) and a richer form of Sisyphus dynamics. In the context of cosmology, the system can serve as a toy model in which, apart from inducing a form of the cyclic universe feature, it is possible to generate an arbitrarily small positive effective cosmological constant. We stress that the model is purely geometrical without introduction of matter degrees of freedom (d.o.f.).

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.98.024004

Authors: Praloy Das, Supriya Pan, Subir Ghosh, Probir Pal

Institutions: Indian Statistical Institute, Raiganj Surendranath Mahavidyalaya, Barasat Government College

Language: English

Topic: Noncommutative and Quantum Gravity Theories

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Inspire Foundation, Department of Science and Technology, Ministry of Science and Technology, India

OpenAlex ID: W2809905572

FWCI: 2.353

Cites: 45

Cited by: 30

Related to: 10