A Tighter Constraint on post-Newtonian Gravity using Millisecond Pulsars.pdfVIP

A TIGHTER CONSTRAINT ON POSTNEWTONIAN GRAVITY USING MILLISECOND PULSARS J F Bell Mount Stromlo and Siding Spring Observatories Institute of Advanced Studies A ustralian National University Private Bag Weston Creek ACT Australia email bel lmsoanueduau ABSTRACT Some theories of gravity predict the existence of preferredframe eects and violations 5 of conservation of energy and momentum General relativity predicts no such eects 9 In the parameterised p ostNewtonian PPN formalism the parameter if these 9 1 eects do not exist The p erio d derivatives P of millisecond pulsars MSPs are used to more tightly constrain these eects by showing that j j g u A Subject headings gravitation relativity stars pulsars general 8 6 8 0 7 0 5 9 / h p - o r t s a The PPN formalism is a very p owerful to ol for ston et al Lorimer et al Bailes et analysing gravitation theory and exp eriment It pro al Camilo Foster Wolszczan Camilo vides a set of parameters the PPN parameters which Nice Taylor Those MSPs in globular clus take dierent values in dierent theories and can ters are excluded as negative p erio d derivatives for b e related to measurable quantities forming a basis pulsars in globular clusters are known to b e caused for comparison of theory and exp eriment See Will by acceleration of the pulsar in the cluster p otential for a summary of the PPN formalism PP