Browsing by Author "Cooperstock, F.I."

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    Influence of the cosmological expansion on local systems
    (2015-03-11) Cooperstock, F.I.; Faraoni, Valerio; Vollick, D.N.
    Following renewed interest, the problem of whether the cosmological expansion affects the dynamics of local systems is reconsidered. The cosmological correction to the equations of motion in the locally inertial Fermi normal frame (the relevant frame for astronomical observations) is computed. The evolution equations for the cosmological perturbation of the two-body problem are solved in this frame. The effect on the orbit is insignificant as are the effects on the galactic and galactic cluster scales.
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    When a mass term does not represent a mass
    (2015-03-11) Faraoni, Valerio; Cooperstock, F.I.
    The definition of mass of a scalar field in a curved space has often been generalized by grouping coupling terms between the field and the Ricci curvature with non-curvature-related mass terms. In a broader point of view, one sees that a common misunderstanding resulting from such an identification leads one, in the case of the spin 2 field, to regard the cosmological constant as a non-vanishing mass of cosmological origin for the graviton. Similarly, there are inconsistencies for the spin 1 field. Instead, the intrinsic mass of a field should be regarded as being independent of the background curvature.