Modern experimental limits of gravity

  1. I've been looking through Gravitation by Misner, Thorne and Wheeler.
    There are a few chapters on experimental verification of general
    relativity, and other theories of gravity (chapters 38-40). I was
    wondering if anyone knew a review or otherwise collection of papers on
    the subject, post-MTW? What new theories have been proposed? Which
    ones have been ruled out by experiment? Has the equivalence principle
    been verified further?

    Thanks in advance,

    Gen Zhang
     
  2. jcsd
  3. Gen Zhang wrote:
    >
    > I've been looking through Gravitation by Misner, Thorne and Wheeler.
    > There are a few chapters on experimental verification of general
    > relativity, and other theories of gravity (chapters 38-40). I was
    > wondering if anyone knew a review or otherwise collection of papers on
    > the subject, post-MTW? What new theories have been proposed? Which
    > ones have been ruled out by experiment? Has the equivalence principle
    > been verified further?


    http://en.wikipedia.org/wiki/Equivalence_principle
    <http://en.wikipedia.org/wiki/Equivalence_principle#Tests_of_the_weak_equivalence_principle>

    The Equivalence Principle is verified for all independent compositions
    of matter,
    http://www.mazepath.com/uncleal/lajos.htm#b1
    spinning masses (gyroscopes),
    Phys. Rev. D 66 022002 (2002)
    quantum spins (magnets),

    <http://www.npl.washington.edu/eotwash/publications/pdf/prl97-021603.pdf>
    <http://www.npl.washington.edu/eotwash/publications/publication.html>
    and relativistic binary pulsars
    http://arxiv.org/abs/astro-ph/0609417
    <http://www.oakland.edu/physics/mog29/mog29.pdf>

    All possible observable Equivalence Principle violations based on
    symmetry-derived fundamental obserables have been tested,

    http://www.mazepath.com/uncleal/lajos.htm#b5

    except one: spacetime geometry versus test mass geometry. Do local
    left and right shoes vacuum free fall along *divergent* minimum action
    trajectories? Mass distribution parity is not a Noetherian symmetry
    for being absolutely discontinuous and discrete. General Relativity
    (GR) models continuous spacetime, going beyond conformal symmetry
    (scale independence) to symmetry under all smooth coordinate
    transformations - general covariance (the stress-energy tensor
    embodying local energy and momentum) - resisting quantization. GR is
    invariant under transformations of the diffeomorphism group.
    Covariance with respect to reflection in space and time is not
    required by the Poincaré group of Special Relativity or the Einstein
    group of General Relativity.

    Do chemically identical opposite parity mass distributions
    reproducibly violate the EP? Affine, teleparallel, and noncommtuative
    gravitation theories allow a chiral vacuum background while wholly
    containing GR as a restricted case, EP=true. Given left footed
    vacuum, local left and right shoes will fit with unequal energies and
    free fall along divergent trajectories. Socks will not care.

    Opposite parity mass distributions of rigidly bound, densely packed
    atomic nuclei near-perfectly arrayed in space and summed to
    macroscopic dimensions form spontaneously. Quality single crystals of
    anything crystallizing in opposite parity space groups P3(1)21 and
    P3(2)1 are calculated satisfactory. Opposed sets of hydrothermally
    cultured P3(1)21 and P3(2)1 alpha-quartz solid single crystal spheres
    allow a parity Eotvos experiment. A faster, cheaper, and more
    sensitive EP parity calorimetric test is proposed,

    http://www.mazepath.com/uncleal/lajos.htm#a2

    Somebody should look.

    A chiral non-rotating body translating through an interactive medium
    will experience a consistent torque. This is *not* relevant to EP
    parity tests.

    HK Moffat, "Six lectures on general fluid dynamics and two on
    hydromagnetic dynamo theory," pp. 175ff in R Balian & J-L Peube (eds),
    "Fluid Dynamics" (Gordon and Breach, 1977)
    http://www.igf.fuw.edu.pl/KB/HKM/PDF/HKM_027_s.pdf
    3.5 megabytes
    pdf pp. 25-27, calculation of the chiral case.

    --
    Uncle Al
    http://www.mazepath.com/uncleal/
    (Toxic URL! Unsafe for children and most mammals)
    http://www.mazepath.com/uncleal/lajos.htm#a2
     
  4. Gen Zhang wrote:
    > I've been looking through Gravitation by Misner, Thorne and Wheeler.
    > There are a few chapters on experimental verification of general
    > relativity, and other theories of gravity (chapters 38-40). I was
    > wondering if anyone knew a review or otherwise collection of papers on
    > the subject, post-MTW? What new theories have been proposed? Which
    > ones have been ruled out by experiment? Has the equivalence principle
    > been verified further?
    >
    > Thanks in advance,
    >
    > Gen Zhang


    You may find some information in
    http://relativity.livingreviews.org/Articles/lrr-2006-3/

    Andreas.
     
  5. On Jul 30, 9:06 am, Gen Zhang <genn...@gmail.com> wrote:
    > I've been looking through Gravitation by Misner, Thorne and Wheeler.
    > There are a few chapters on experimental verification of general
    > relativity, and other theories of gravity (chapters 38-40). I was
    > wondering if anyone knew a review or otherwise collection of papers on
    > the subject, post-MTW? What new theories have been proposed? Which
    > ones have been ruled out by experiment? Has the equivalence principle
    > been verified further?
    >
    > Thanks in advance,
    >
    > Gen Zhang


    You might try searching on "Clifford Will". I think he specializes in
    this subject area.

    Rob
     
  6. Try

    http://relativity.livingreviews.org/Articles/lrr-2006-3/

    "The Confrontation between General Relativity and Experiment"

    by Clifford M. Will. (Focus is on verification of GR rather than
    distinguishing it from alternatives).

    Ralph.

    On Mon, 30 Jul 2007 13:06:35 +0000, Gen Zhang wrote:

    > I've been looking through Gravitation by Misner, Thorne and Wheeler.
    > There are a few chapters on experimental verification of general
    > relativity, and other theories of gravity (chapters 38-40). I was
    > wondering if anyone knew a review or otherwise collection of papers on
    > the subject, post-MTW? What new theories have been proposed? Which ones
    > have been ruled out by experiment? Has the equivalence principle been
    > verified further?
    >
    > Thanks in advance,
    >
    > Gen Zhang
     
  7. On Jul 31, 8:33 pm, Ralph Loader <n...@i.geek.nz> wrote:
    > Try
    >
    > http://relativity.livingreviews.org/Articles/lrr-2006-3/
    >
    > "The Confrontation between General Relativity and Experiment"
    >
    > by Clifford M. Will. (Focus is on verification of GR rather than
    > distinguishing it from alternatives).
    >
    > Ralph.


    Actually, I was more interested in distinguishing it from
    alternatives. One of the more "fun" bits in MTW was the chapter on
    parametric post-Newtonian (PPN) approximations. I liked the elegance,
    strangely enough. I was wondering if a post-PPN model had been
    created, such that we could distinguish between, say, GR, teleparallel
    gravity, and gauge-theory-gravity (the Geometric Algebra approach by
    the Cambridge people)?

    Gen
     
  8. Gen Zhang wrote:
    > I've been looking through Gravitation by Misner, Thorne and Wheeler.
    > There are a few chapters on experimental verification of general
    > relativity, and other theories of gravity (chapters 38-40). I was
    > wondering if anyone knew a review or otherwise collection of papers on
    > the subject, post-MTW? What new theories have been proposed? Which
    > ones have been ruled out by experiment? Has the equivalence principle
    > been verified further?


    Others have already suggested Clifford M Will's article
    http://relativity.livingreviews.org/Articles/lrr-2006-3/
    which is an excellent review article on the general subject of
    experimental tests of general relativity, including an extensive
    bibliography.

    Will is also the author of a superb technical book on this subject,
    "Theory and Experiment in Gravitational Physics" (Cambridge U.P., 1st
    edition 1992, I think there is also a newer edition out), which goes
    into more detail than his Living Reviews paper.

    He has also written a non-technical book on this topic
    @book {
    author = "Clifford M. Will",
    title = "Was Einstein Right?: Putting General Relativity to the Test",
    Edition = "2nd",
    Publisher = "Perseus/Basic Books",
    isbn = "0-465-09086-9 (paperback)",
    year = "1993 (2nd edition may be newer??)",
    }

    ciao,

    --
    -- Jonathan Thornburg (remove -animal to reply) <J.Thornburg@soton.ac-zebra.uk>
    School of Mathematics, U of Southampton, England
    "Washing one's hands of the conflict between the powerful and the
    powerless means to side with the powerful, not to be neutral."
    -- quote by Freire / poster by Oxfam
     
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