Time and space: are they material realities or product of human consciousness?

The words Time and Space both have multiple meanings – not that you would guess that by listening to most scientists on the topic. Both meanings of Time are abstracts, one meaning of Space is. So the answer to your question is they can both be products of human consciousness. Let me explain:-

‘Space’ has several (related) meanings. A space could be a gap e.g. in a car park, for example. Space also refers to the dimension of position, i.e. the three vectors of xys axis. Or Space might mean ‘everything not on earth’ as in ‘outer space’.

And sometimes Space refers to the entire known universe.

But science is so often not specific when it uses the words. It liberally, lazily conflates these different meaning of these words.

In the context of dimension, space is the dimension of position. That is the three sub-dimension of length, breadth and height (xyz-axis), calibrated in standard units, allow us to overlay an abstract framework that calibrates and indexes position, and relative position.

‘Time’ has two core meanings…to expand on this:-

The ONLY empirical evidence of Time is change / change events (look around you – earth spinning, you breathing, quarks decaying – all change event series). Change can be quantum or compound, depending on your reference-frame. Time represents TWO distinct contexts of change:

1.The calibration of change (i.e. the dimension of change – hence ‘rate’ e.g. miles PER HOUR – the calibration of change of position aka motion) i.e. Time is to change what temperature is to heat, a dimension/calibration set. Temperature is abstract, heat is real, Time is abstract, change is real; and

2. Time is the collective ‘flow’ of change. Time is to change-events what ‘River’ is to water molecules – a collective term. Is a river real? Well yes, on one level; but, fundamentally the word River is an abstract collective, water molecules are real. So too Time is a collective abstract, change-events are real – Time, the ‘flow’ of change.

Time, one word, two distinct meaning, both reference change.

So, both words Time and Space have a context / definition as dimension, i.e. are abstract, or , as you say are products of human consciousness

Hence Space (in this context) is the (abstract) dimension of position, and Time (in this context) is the (abstract) dimension of change. So merge the two and space-time is the (abstract) dimension of changing position aka Motion.

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In a universe where nothing changed, would time cease to exist? Would the concept of spacetime become meaningless? Is time simply a way for accounting for change (physical motion)?

“Is time simply a way of accounting for change (physical motion)?” Almost.

Motion is only one type of change, that is change of (relative) spatial position. There is other types of change..change of colour, of weight, of mass, of density, tone, radioactivity etc etc.

Time calibrates all change…in standard units of, say, years, days, seconds etc. (I.e.miles PER HOUR…change rate is measured in time units).

And the word time actually has two core meanings, both referencing change.

To expand:-

As you touch on, The ONLY empirical evidence of Time is change / change events (look around you – earth spinning, you breathing, quarks decaying – all change event series). Change can be quantum or compound, depending on your reference-frame.

Time represents TWO distinct contexts of change:

1.The calibration of change (i.e. the dimension of change – hence ‘rate’ e.g. miles PER HOUR – the calibration of change of position aka motion) i.e. Time is to change what temperature is to heat, a dimension/calibration set. Temperature is abstract, heat is real, Time is abstract, change is real. (This is more or less what you say); and

  1. Time is the collective ‘flow’ of change. Time is to change-events what ‘River’ is to water molecules – a collective term. But, fundamentally the word River is an abstract collective, water molecules are real. Time is a collective abstract, change-events are real. Time, the ‘flow’ of change.

Time, one word, two distinct meanings, both reference change.

And so, Space is the dimension of (relative) position (hence xyz axis). And Time is the dimension of change.

So merge Space the dimension of position, with Time the dimension of change and you get spacetime the dimension of changing position aka motion.

Is time simply a way of accounting for change (physical motion)?” Almost.

Motion is only one type of change, that is change of (relative) spatial position. There is other types of change..change of colour, of weight, of mass, of density, tone, radioactivity etc etc.

Time calibrates all change…in standard units of, say, years, days, seconds etc. (I.e.miles PER HOUR…change rate is measured in time units).

And the word time actually has two core meanings, both referencing change.

To expand:-

As you touch on, The ONLY empirical evidence of Time is change / change events (look around you – earth spinning, you breathing, quarks decaying – all change event series). Change can be quantum or compound, depending on your reference-frame.

Time represents TWO distinct contexts of change:

1.The calibration of change (i.e. the dimension of change – hence ‘rate’ e.g. miles PER HOUR – the calibration of change of position aka motion) i.e. Time is to change what temperature is to heat, a dimension/calibration set. Temperature is abstract, heat is real, Time is abstract, change is real. (This is more or less what you say); and

2. Time is the collective ‘flow’ of change. Time is to change-events what ‘River’ is to water molecules – a collective term. But, fundamentally the word River is an abstract collective, water molecules are real. Time is a collective abstract, change-events are real. Time, the ‘flow’ of change.

Time, one word, two distinct meanings, both reference change.

And so, Space is the dimension of (relative) position (hence xyz axis). And Time is the dimension of change.

So merge Space the dimension of position, with Time the dimension of change and you get spacetime the dimension of changing position aka motion.

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How can time be the 4th dimension if time isn’t real?

You’ve hit on one of the fundamental misunderstandings that bedevil this area of science…

All dimensions are abstract (i e. only exist in our collective minds). So many people struggle to differentiate between what is real and tangible (‘concrete’ nouns) and what only exists in our collective minds (‘abstract’ nouns).

We overlay reality with standardised calibration frameworks in order to calibrate and index an aspect of reality.

For example, we calibrate and index heat using the dimension of temperature. Heat is real, temperature is abstract.

We calibrate position, and relative position, using the three vectored dimension we call Space. [The word Space has (at least) two distinct meanings. Yes, it is a word that, vaguely, refers to ‘outer space’, i e.something ‘real’…though its never quute clear what].

But its meaning here, in context of dimensions, is clear. We calibrate and index [spatial] position, relative position, and changing position (motion) using the three vectored abstract dimension of Space (calibrated on standard units of miles, kilometres, inches etc etc)…the xyz axis only exists in our mind, like temperature does.

And so to Time (another word with multiple meanings). Time calibrates and indexes change and events. In the example of changing position (motion) we use, say, miles per hour to measure the rate of change. The ‘per hour’ bit is time calibrating change. And we index events using the same framework of standard units (years, days, hours etc) to reference an event..be it Big Bang (14 billion years ago) or lunch date next week (tuesday at 1).

So ALL dimensions are abstract overlays which calibrate, index and reference an underlying aspect of reality.

If people can’t simply point to what underlying aspect of reality their ‘dimension’ references, then it probably ain’t a dimension…just hectic maths.

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