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# Space and Time Prof. Brad Dowden Philosophy Department California State University Sacramento - PowerPoint PPT Presentation

Space and Time Prof. Brad Dowden Philosophy Department California State University Sacramento. What is time?. physical time vs. psychological time. Time enables us. to place events in sequence one after the other, to compare how long an event lasts, to tell when an event occurs.

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Space and TimeProf. Brad DowdenPhilosophy DepartmentCalifornia State University Sacramento

time?

psychological time

• to place events in sequence one after the other,

• to compare how long an event lasts,

• to tell when an event occurs.

According to the definition of time travel, the traveler’s journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

There’s a way now for you to visit Sacramento in 2188 journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

(In case of a zombie attack be sure to take this kit with you).

### How long does it take to fall into a black hole? journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

A wormhole can be a time machine. journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

### The grandfather paradox journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

Paradox of Free Information journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

• In 2077, time machines are invented. In 2099 Jones discovers a drug that cures cancer. Jones patents her drug in 2100. In 2121 Smith makes a copy of the patent, enters a time machine, and goes back and gives the copy to Jones in 2099 who then uses it to create a drug that cures cancer. Who had the idea first?

What is space? journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

Can space move or is it stuck where it is? journey as judged by the traveler’s clock takes a different amount of time than the journey does as judged by the clocks of those who do not take the journey.

### After you take all energy and matter out of space, what is left?

Newton vs. Leibniz

Kant left?

Hubble discovered galaxies, and discovered that galaxy red-shift indicates galaxies are receding from us.

What is the Big Bang? red-shift indicates galaxies are receding from us.

To create an apple pie from red-shift indicates galaxies are receding from us.

scratch you should start by…

…creating the universe. red-shift indicates galaxies are receding from us.

### What did Einstein mean by saying time is relative? a cubic box one foot on a side?

What is meant by saying space is a continuum? a cubic box one foot on a side?

So, how DO WE KNOW our a cubic box one foot on a side?space is not

discrete?

Is this a good

it’s just obvious

to me.”

So, how do we know

whether our space

is discrete?

4

5

### Pythagorean Theorem a cubic box one foot on a side?a2 + b2 = c2

5

4

5

If so, would it be time to INVENT a new geometry? a cubic box one foot on a side?

Who solved Zeno’s Paradoxes? a cubic box one foot on a side?

Have dinosaurs slipped out of reality? a cubic box one foot on a side?

What is the a cubic box one foot on a side?shape of space?

What is a cubic box one foot on a side?

the

Multi-

verse?

More philosophy of time… a cubic box one foot on a side?