Introduction E9F5FC

Questions FFFFC0

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时空

• WSU: Special Relativity with Brian Greene 11 hours
• https://worldscienceu.com/courses/special-relativity-world-science-u/
• WSU: Brian Greene. Space, Time, and Einstein.
• The Meaning of Einstein's Equation Baez, Bunn.
• A moving point is a line, a moving line is a plane, a moving plane is a volume... Time is the addition of a scalar (from a field), thus the addition of choice. Time relates affine and projective space. Compare time with space. A moving "center" is a point: the center is what moves, thus what has time.
• Moving backwards and forwards in time - is a (wasteful) duality. Why is it dual?
• The four dimensions of space-time relate to the four choice-frameworks. And perhaps time is the internal choice. And consider six pairs among the four.

Gravity

• In time, fermions (particles with mass) grow more specified in terms of their location with respect to each other. This equals a shrinking of space. And perhaps this shrinking of space is balanced by the expansion of the universe (and what does that expansion mean?)
• Visatos traukos - kad ir labai, labai silpnos - kadangi visata turi centrą - turėtų užtekti sukurti lauko nelygybę, nesimetriškumą - ir tokiu būdu įtakoti kvantinius reiškinius. Tai gali būti traukos paskirtis.
• Gravity (like space and time) is that which cannot be entirely removed from a subsystem. Gravity pervades all systems throughout the universe. There is no "gravity shield" as there can be for electromagnetism, for heat, for chemical interactions, for radiation, etc.

Relativity

• In the twin paradox, how do we know which twin was accelerated? What expresses force?

Reversibility of time

• Symmetric space Isometry in the reversing the direction of geodesics (reversing the path of time) is equivalent to the vanishing of the covariant derivative of the curvature tensor (so that the space is flat). Whether or not time is reversible is thus related to the flatness of the manifold.
• The reversibility of time relates to the symmetry of choices in coordinate systems (Dn). The nonreversibility of time relates to the asymmetry of choices in simplexes (An).
• Space time held together by entanglement - current idea
• A field is relationship between all of space and all of time.
• x's are what is, and t is what we can borrow (energy) from, in the metric: {$\sum {x_i}^2 - t^2$}
• From dream: Space is made up of all possible curves. Physics is about the geodesics, the curves with no slack. They really are all one curve that goes through every curve and every single point.