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dc.contributor.authorPerlman, E. S.
dc.contributor.authorChristiansen, W. A.
dc.contributor.authorNg, Y. J.
dc.contributor.authorDeVore, J.
dc.contributor.authorPooley, D.
dc.contributor.authorRappaport, Saul A
dc.date.accessioned2015-09-03T18:16:41Z
dc.date.available2015-09-03T18:16:41Z
dc.date.issued2015-05
dc.date.submitted2014-11
dc.identifier.issn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1721.1/98362
dc.description.abstractOne aspect of the quantum nature of spacetime is its "foaminess" at very small scales. Many models for spacetime foam are defined by the accumulation power α, which parameterizes the rate at which Planck-scale spatial uncertainties (and the phase shifts they produce) may accumulate over large path lengths. Here α is defined by the expression for the path-length fluctuations, δ𝓁 ≃ 𝓁[superscript 1 - α]𝓁[α over P], with 𝓁[subscript P] being the Planck length. We reassess previous proposals to use astronomical observations of distant quasars and active galactic nuclei to test models of spacetime foam. We show explicitly how wavefront distortions on small scales cause the image intensity to decay to the point where distant objects become undetectable when the path-length fluctuations become comparable to the wavelength of the radiation. We use X-ray observations from Chandra to set the constraint α [> over ~] 0.58, which rules out the random-walk model (with α = 1/2). Much firmer constraints can be set by utilizing detections of quasars at GeV energies with Fermi and at TeV energies with ground-based Cerenkov telescopes: α [> over ~] 0.67 and α [> over ~] 0.72, respectively. These limits on α seem to rule out α = 2/3, the model of some physical interest.en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/0004-637x/805/1/10en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceIOP Publishingen_US
dc.titleNEW CONSTRAINTS ON QUANTUM GRAVITY FROM X-RAY AND GAMMA-RAY OBSERVATIONSen_US
dc.typeArticleen_US
dc.identifier.citationPerlman, E. S., S. A. Rappaport, W. A. Christiansen, Y. J. Ng, J. DeVore, and D. Pooley. “NEW CONSTRAINTS ON QUANTUM GRAVITY FROM X-RAY AND GAMMA-RAY OBSERVATIONS.” The Astrophysical Journal 805, no. 1 (May 13, 2015): 10. © 2015 The American Astronomical Societyen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.departmentMIT Kavli Institute for Astrophysics and Space Researchen_US
dc.contributor.mitauthorRappaport, Saul A.en_US
dc.relation.journalThe Astrophysical Journalen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsPerlman, E. S.; Rappaport, S. A.; Christiansen, W. A.; Ng, Y. J.; DeVore, J.; Pooley, D.en_US
dc.identifier.orcidhttps://orcid.org/0000-0003-3182-5569
mit.licensePUBLISHER_POLICYen_US


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