Time may emerge from energy and change, not the other way around
A growing set of conceptual frameworks challenges the idea that time is a fundamental dimension woven into the fabric of the universe. One proposal argues that time is an emergent feature of localized energetic interactions—what the author calls 'ripples'—and that time exists only within these coherent structures, not as a global property [1]. Another framework similarly concludes that time is a macro-effect generated by the rate of energy transformation and material state changes, rather than a dimension that dictates matter [4]. In this view, the perpetual transformation of energy creates the illusion of time.
These ideas build on the observation that we never measure time directly; we measure change. Clocks rely on oscillating atoms, calendars on Earth's rotation, and biological rhythms on chemical reactions. If all energetic change were to stop, the frameworks suggest, time would functionally cease—at least within that localized system [1][4]. This reframes time from a stage on which events unfold to a property that emerges from the events themselves.
Some philosophers argue time is a useful description, not a thing that exists
A different line of critique focuses on the ontological status of space and time in modern physics. One materialist analysis argues that space, time, coordinate systems, and geometric structures are instruments for describing material processes rather than independent physical entities [2]. The paper questions the logical jump from the empirical success of relativistic theories to the conclusion that space-time exists as an autonomous physical object. In this view, time is real in the sense that it helps us describe reality, but it is not a separate entity with its own existence.
This perspective distinguishes between physical reality and the mathematical frameworks used to model it [2]. Just because a coordinate system works well does not mean the coordinates themselves are constituents of reality. The debate then becomes not whether time 'exists' in some everyday sense—clearly change happens—but whether time is a fundamental feature of the universe or a useful abstraction imposed by observers.
Time may depend on observation and consciousness
One framework bridges physics with cognitive neuroscience by examining the case of dreamless sleep. The author argues that time functionally ceases to exist when the cognitive observation of energetic change is absent [4]. This suggests that our experience of time is tied to our perception of change, and without that perception—as in deep sleep—time as a lived phenomenon disappears.
This does not mean time stops for the universe, but it raises the question of whether time is a feature of reality independent of observers or a product of how conscious minds process energetic change [4]. The framework proposes that time is relational, arising from the interaction between energy transformations and the cognitive systems that observe them. Whether this applies beyond human experience remains an open question.
The existence of past, present, and future is still debated
Beyond the question of whether time exists at all, philosophers continue to investigate the ontological status of past, present, and future tenses [3]. Do only the present moment and its contents exist, or are past and future equally real in some sense? This debate—between presentism, eternalism, and other views—remains unresolved in contemporary philosophy of time [3].
The supplied evidence does not settle this question, but it shows that the existence of time is not a single yes-or-no issue. One can accept that change is real while questioning whether time is fundamental [1][2], or argue that time is inseparable from existence and human belonging [5]. The answer to 'how do we know time exists' may depend on what kind of existence we are asking about: fundamental, emergent, descriptive, or experiential.
Sources used in this answer
Time Exists Only in Ripples
Time is proposed as an emergent property of localized energetic interactions called 'ripples,' existing only within these structures rather than as a global feature of reality.
Matter, Coordinates, and the Ontological Status of Space-Time: A Materialist Critique of Relativistic Realism
Space, time, and coordinate systems are argued to be descriptive instruments for material processes rather than independent physical entities.
The problem of the ontological status of past, present and future tenses in contemporary philosophy of time
The ontological status of past, present, and future tenses remains a subject of investigation in contemporary philosophy of time.
Energy Transformation as the Fundamental Reality: Deconstructing Time from Spacetime Geometry to Cognitive Perception
Time is proposed as an emergent macro-effect of energy transformation and material state changes, functionally ceasing when cognitive observation of change is absent, as in dreamless sleep.
Existence and Time
Existence, time, and belonging are argued to be inseparable dimensions of human reality, with human thought oscillating between cyclical and directional conceptions of time.