Abstract Details
| Name: Kiren OV Affiliation: St Josephs Indian Composite PU College, Bengalore Conference ID: ASI2019_64 Title : Planet Nine: Testing ground for Dark Matter and Alternate Models Authors and Co-Authors : Kenath Arun, C Sivaram Abstract Type : Poster Abstract Category : General Relativity and Cosmology Abstract : Recently there has been much excitement about the possibility of a remote massive planet orbiting the sun,far beyond the orbit of Neptune.The presence of such a planet was inferred from the peculiar clustering of six previously known Trans Neptunian Objects.It is postulated that a planet with the mass of Neptune has shepherded the six objects into their strange elliptical orbits. However until direct direction is achieved it remains a hypothesis.Here we propose the possibility that this recently postulated Neptune-sized planet with an orbital period of 1500 years could be a gravitationally condensed DM object.The observed mass of Planet Nine fits with the theoretical mass predicted for such DM objects formed by 60GeV DM particles,which is currently favoured DM particles.Here we look at the possible ways of formation of such DM planets and their number density in the solar neighbourhood.It is of interest to note that such DM objects with plantary mass could have formed in the early Universe well before stars and galaxies.These could be primordial planets that could make up much of DM.As Planet Nine has an expected orbit 200times the distance of Neptune,the solar gravitational acceleration would drop to MOND value of 10^-8cms^-2.So if there are objects orbiting the sun,at few thousand AU,MOND would suggest that their orbital velocity tends to a constant value given independent of their distance from the sun.In principle,MOND should apply whenever in an autonomous gravitationally bound system,the acceleration drops below the MOND acceleration,the force law should change and objects orbiting at larger distances should show an asymptotically constant velocity.Thus this object could also provide us with a testing ground for modification of Newtonian Dynamics(MOND). |