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  • Time's Arrow, Black Holes and Maxwell's Demon -- FQxI Podcast by Paul Davies

Why does time flow in only one direction? Why do we grow older, not younger? Many physicists relate time's arrow to "entropy" -- a measure of disorder. But if that's so, how did the universe seem to move towards more order with the formation of galaxies and planets?

Physicist Paul Davies of Arizona State University answers those questions and more, with Logan Chipkin. The conversation covers the role of gravity in constructing time's arrow, exemplified by black holes. They also cover the black hole information paradox -- and Davies' personal recollections of attending Stephen Hawking's seminal lecture on the idea that black holes aren't really so black, but slowly radiate energy. And they chat about the idea that information can be used as a fuel -- a concept that is now being exploited to build better nano devices. But as Davies notes, nature got there first. And finally there's a sociological turn: Could universities be improved -- or not?

This is the second part of FQXi's podcast series on "Irreversibility" -- in this case writ large on the cosmic scale.

Keywords: #Irreversibility #InformationAsFuel #Time #TimesArrow #BlackHole #Hawking #InformationParadox #MaxwellsDemon #Universities #quantumphysics #physics #life #PaulDavies

a month later

I shortened the phrase聽Zeeya Merali聽 芦Why does time flow....?聽 聽

How does time (present) move along the axis of time, creating the past?聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽

Motion is changes in the coordinate system. By time, coordinate system, only time. If time (present) moves in time (creates the duration of the event),聽changes in the direction of movement of time or its speed are required.

When moving a solid in space, the dimension聽is [m/s]. Multiplying speed by event duration [sec] shows the path in meters. The speed of movement of the substance in time, dimensionless [sec/sec]. Dimensionless exists when comparing systems of the same type - the ratio (Example, 聽income 聽has doubled).

.....2. The dimensionless movement of matter over time shows that there is no real movement of matter over time (as the duration of the event). The universe is always聽constant - the present.聽Dimensionlessness聽forbids聽time travel.

3. The duration聽of the present tense has a certain period. The sum of periods creates the duration of the Time event.

4. Accelerating the speed of time movement in the universe creates the following effect. The movement of time, at the speed of light, stops. Photons, moving at the speed of light, recorded the pace of time that existed at the time of the photon. The duration of the past moment "now" when registered in the modern present creates a "red" shift in the spectrum of radiation of atoms. The effect enhances the amount of "red" displacement from the expansion of the Universe and must be taken into account.

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