Probing Quantum Violations of the Equivalence Principle

Adunas, G. Z.; Rodriguez-Milla, Bety; Ahluwalia, Dharam Vir

doi:10.1023/a:1002749217269

Cited by 57 publications

(45 citation statements)

References 34 publications

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“…This was first noted in Refs. [16,17]. These fractional accuracies are determined by the underlying mass eigenstates, and the mixing matrix.…”

Section: Equivalence Principle In the Igqrmentioning

confidence: 99%

Interface of Gravitational and Quantum Realms

Ahluwalia

2002

Mod. Phys. Lett. A

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The talk centers around the question: Can general-relativistic description of physical reality be considered complete? On the way I argue how -unknown to many a physicists, even today -the "forty orders of magnitude argument" against quantum gravity phenomenology was defeated more than a quarter of a century ago, and how we now stand at the possible verge of detecting a signal for the spacetime foam, and studying the gravitationally-modified wave particle duality using superconducting quantum interference devices.Keywords: Quantum gravity phenomenology, gravitationally-induced phases, flavoroscillation clocks, gravitationally-modified wave particle duality. PreambleThe idea for the First IUCAA Meeting on the Interface of Gravitational and Quantum Realms (17-21 December 2001, Pune, India) arose during a walk, a year before, with Naresh Dadhich. A reader who was not at IGQR-I is likely to find a contradiction between what I write here and what Naresh Dadhich and I write in the opening lines of the Preface. For that reader I note that the physics walks at IUCAA often begin with a left turn exit from the main IUCAA entrance, they wind through a narrow road on the outskirts of an open field. Mid way in the walk, on the left of that narrow lane, is a tree. The tree provides shade for a chai ("tea") and samosa break, and hosts birds of several species. After the chai the walk continues. The walk, punctuated by a chai and samosa break, is an important part of life at IUCAA. Such walks inspire a whole range of new ideas and provide an opportunity for monastic reflections.

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“…This was first noted in Refs. [16,17]. These fractional accuracies are determined by the underlying mass eigenstates, and the mixing matrix.…”

Section: Equivalence Principle In the Igqrmentioning

confidence: 99%

Interface of Gravitational and Quantum Realms

Ahluwalia

2002

Mod. Phys. Lett. A

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“…In short, an application of the EP to the motion of Cooper pairs within a superconductor is fundamentally precluded by the UP. This is not to make the well-known point that quantum field theories may lead to measurable "quantum violations of the EP" due to possible "fifth-force" effects that produce slight corrections to particle geodesics (see, for example, Adelberger [6] and Ahluwalia [17]), but rather to observe that the non-localizability of quantum objects places a fundamental limit on the applicability of the EP (a point previously raised by Chiao [18, esp. Section V]).…”

Section: The Uncertainty Principle Limits the Applicability Of Thmentioning

confidence: 99%

Do mirrors for gravitational waves exist?

Minter

Wegter-McNelly

Chiao

2010

Physica E: Low-dimensional Systems and Nanostructures

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Thin superconducting films are predicted to be highly reflective mirrors for gravitational waves at microwave frequencies. The quantum mechanical non-localizability of the negatively charged Cooper pairs, which is protected from the localizing effect of decoherence by an energy gap, causes the pairs to undergo non-picturable, non-geodesic motion in the presence of a gravitational wave. This non-geodesic motion, which is accelerated motion through space, leads to the existence of mass and charge supercurrents inside the superconducting film. On the other hand, the decoherence-induced localizability of the positively charged ions in the lattice causes them to undergo picturable, geodesic motion as they are carried along with space in the presence of the same gravitational wave. The resulting separation of charges leads to a virtual plasma excitation within the film that enormously enhances its interaction with the wave, relative to that of a neutral superfluid or any normal matter. The existence of strong mass supercurrents within a superconducting film in the presence of a gravitational wave, dubbed the "HeisenbergCoulomb effect," implies the specular reflection of a gravitational microwave from a film whose thickness is much less than the London penetration depth of the material, in close analogy with the electromagnetic case. The argument is developed by allowing classical gravitational fields, which obey Maxwell-like equations, to interact with quantum matter, which is described using the BCS and Ginzburg-Landau theories of superconductivity, as well as a collisionless plasma model. Several possible experimental tests of these ideas, including mesoscopic ones, are presented alongside comments on the broader theoretical implications of the central hypothesis.

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“…The latest neutron interferometry experiments report a statistically significant discrepancy between the experiment and theory, and it has been suspected by the experimenters that this discrepancy may represent a difference between the ways in which gravity acts in classical and quantum mechanics [4]. In reality, from an operational point of view one cannot claim, even in principle, that there exists, for certain quantum systems, an exact equality of gravitational and inertial masses [5,6].…”

Section: Introductionmentioning

confidence: 99%

Quantum mechanics versus equivalence principle

Accioly

Paszko

2008

Phys. Rev. D

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We consider the scattering of a photon by a weak gravitational field, treated as an external field, up to second order of the perturbation expansion. The resulting cross section is energy dependent which indicates a violation of Galileo's equivalence principle (universality of free fall) and, consequently, of the classical equivalence principle. The deflection angle for a photon passing by the sun is evaluated afterward and the likelihood of detecting(where E is the value predicted by Einstein's geometrical theory for the light bending) in the foreseeable future, is discussed.

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Probing Quantum Violations of the Equivalence Principle

Cited by 57 publications

References 34 publications

Interface of Gravitational and Quantum Realms

Interface of Gravitational and Quantum Realms

Do mirrors for gravitational waves exist?

Quantum mechanics versus equivalence principle

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