SpaceTime

Discussion in 'Physics & Math' started by jaiii, Mar 7, 2014.

  1. jaiii Registered Senior Member

    Messages:
    195
    Hi.

    What is space time?

    Is real,have energy or mass?

    How energy curvature of space time?

    Thank.

    By.
     
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  3. paddoboy Valued Senior Member

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    27,543
    Space/time is a 4 dimensional network that sprung forth/evolved from the BB.
    The existence and reality of the 4 dimensional entity we call space/time, is supported and verified in GR.

    I'm not sure why mass/energy does curve space/time [others here may know] but those observations have been supported by many experiments and observations/
    In reality, science describes what happens...as to why is something else.
     
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  5. Aqueous Id flat Earth skeptic Valued Senior Member

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    Space and time, when treated together, especially in relativitistic physics, display a complementary relationship. Specifically, if one decreases - as the projection of the hypotenuse of a right triangle according to the cosine of the angle to the base, the other increases as the sine of that same angle projecting onto the altitude.

    It's real in the sense that the phenomena of relativity really take place.

    No, not unless you're talking about quantum fluctuations which I would say is an entirely different subject.

    There is no curvature at all, until you introduce more than one reference frame. Curvature is always a comparison between two frames. However either of the two causes for curvature -- gravity(mass) and velocity -- can always be compared to a baseline. Velocity can be compared to stasis (no motion with respect to the frame) and gravity (due to mass) can always be compared to the condition at infinity, where all gravity approaches zero. Consequently people talk about the curvature of spacetime as if only one frame is being considered, when really it's always measured against some baseline.
     
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  7. brucep Valued Senior Member

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    4,098
    Great answers. Especially the last paragraph.
     

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