Scalar-tensor gravity coupled to a global monopole and flat rotation curves

Details Scalar-tensor gravity coupled to a global monopole and flat rotation curves Scalar-tensor gravity coupled to a global monopole and flat rotation curves

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvd..69l7502l&link_type=abstract

Physical Review D, vol. 69, Issue 12, id. 127502

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14

Gravity In More Than Four Dimensions, Kaluza-Klein Theory, Unified Field Theories, Alternative Theories Of Gravity, Magnetic Monopoles, Dark Matter, Galactic Halo

Scientific paper

In a scalar-tensor theory of gravity we consider a global monopole field as a candidate for galactic dark matter. Within the weak gravity approximation we solve the equations of a metric tensor and a scalar field coupled to the monopole and determine the asymptotic structure of a galactic spacetime for large r. In the case of a massless scalar field, we derive a formula for the rotation velocity of stars, which contains an extra constant value in addition to the other known terms, and we discuss its relation to flat rotation curves in the galaxy.

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