Effect of equation of state and composition on relativistic flows

Chattopadhyay1*, S. Mandal2, H. Ghosh3, S. Garain3, R. Kumar1, and D. Ryu4
1ARIES, Manora Peak, Nainital 263129, Uttarakhand, India
2IIST, Thiruvananthapuram, India
3S. N. Bose National Centre for Basic Sciences, Saltlake JD Block, Kolkata 700098, India
4Dept of Astronomy & Sp. Sc., Chungnam National University, Kung Dong, Daejeon, South Korea

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The thermal state of the fluid is governed by the ratio of the thermal and the rest energy. This brings the composition of the fluid into the picture. The fluid composed of lighter particles (e.g: electron-positron pair plasma) at same temperature, is more relativistic compared to fluids with finite baryon loading, but this is not necessarily true when baryon poor transonic fluid are compared with each other. It could be shown that the transonic pair-fluid is the least relativistic. This result has far reaching consequences on accreting flows around compact objects and are expected to have similar effect on relativistic outflows and explosive events as well.

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Keywords : accretion, accretion discs-Jets, outflows and bipolar flows-black hole physics - hydrodynamics - Transonic fluids - shock waves - relativity.