Journal
PHYSICAL REVIEW D
Volume 104, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.123005
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Funding
- IISER Kolkata
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The equations of state for neutron stars should take into account the effect of gravitational time dilation, resulting in a higher mass limit due to the varying interior metric over the length scale of the star.
In order to solve the Tolman-Oppenheimer-Volkoff equations for neutron stars, one routinely uses the equations of state which are computed in the Minkowski spacetime. Using a first-principle approach, it is shown that the equations of state which are computed within the curved spacetime of the neutron stars include the effect of gravitational time dilation. It arises due to the radially varying interior metric over the length scale of the star and consequently it leads to a much higher mass limit. As an example, for a given set of parameters in a a- - co model of nuclear matter, the maximum mass limit is shown to increase from 1.61 M circle dot to 2.24 M circle dot due to the inclusion of gravitational time dilation.
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