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<p>In this paper, we define the concept of a cosmological time function on Lorentzian length spaces. We prove that a Lorentzian length space is globally hyperbolic if and only if the cosmological time function of a Lorentzian length space within its conformal class is regular. Additionally, we establish an ordering in the space of Lorentzian length spaces on a proper metric space and investigate stable causality in its fundamental form. Furthermore, we show that this definition of stable causality implies the existence of a time function inspired by the cosmological time function.</p>

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Cosmological time functions in Lorentzian length spaces

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Mahla Hoseini,
  • Neda Ebrahimi,
  • Mehdi Vatandoost

摘要

In this paper, we define the concept of a cosmological time function on Lorentzian length spaces. We prove that a Lorentzian length space is globally hyperbolic if and only if the cosmological time function of a Lorentzian length space within its conformal class is regular. Additionally, we establish an ordering in the space of Lorentzian length spaces on a proper metric space and investigate stable causality in its fundamental form. Furthermore, we show that this definition of stable causality implies the existence of a time function inspired by the cosmological time function.