Thermal nature of a generic null surface

  title={Thermal nature of a generic null surface},
  author={Surojit Dalui and Bibhas Ranjan Majhi and Thanu Padmanabhan},
  journal={Physical Review D},
Dynamical properties of a generic null surface are known to have a thermodynamic interpretation. Such an interpretation is completely based on an analogy between the usual law of thermodynamics and structure of gravitational field equation on the surface. Here we materialise this analogy and show that assigning a temperature on the null surface for a local observer is indeed physically relevant. We find that for a local frame, chosen as outgoing massless chargeless particle (or field mode… 
Kinematics and dynamics of null hypersurfaces in the Einstein-Cartan spacetime and related thermodynamic interpretation
A general geometric construction of a generic null hypersurface in presence of torsion in the spacetime (Riemann-Cartan background), generated by a null vector l, is being developed here. We then


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The emergent gravity paradigm interprets gravitational field equations as describing the thermodynamic limit of the underlying statistical mechanics of microscopic degrees of freedom of the
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We show that the equation of motion of scalar-tensor theory, along the likes of GR and its higher order generalization i.e Lanczos-Lovelock gravity, acquires thermodynamic identity when projected on
A Dialogue on the Nature of Gravity
I describe the conceptual and mathematical basis of an approach which describes gravity as an emergent phenomenon. Combining principle of equivalence and principle of general covariance with known
Thermodynamic structure of Lanczos-Lovelock field equations from near-horizon symmetries
It is well known that, for a wide class of spacetimes with horizons, Einstein equations near the horizon can be written as a thermodynamic identity. It is also known that the Einstein tensor acquires
Gravitational field equations near an arbitrary null surface expressed as a thermodynamic identity
A bstractPrevious work has demonstrated that the gravitational field equations in all Lanczos-Lovelock models imply a thermodynamic identity T δλS = δλE + P δλV (where the variations are interpreted
A boundary term for the gravitational action with null boundaries
Constructing a well-posed variational principle is a non-trivial issue in general relativity. For spacelike and timelike boundaries, one knows that the addition of the Gibbons–Hawking–York (GHY)
Thermodynamics of spacetime: The Einstein equation of state.
  • Jacobson
  • Physics
    Physical review letters
  • 1995
The Einstein equation is derived from the form of black hole entropy together with the fundamental relation $\delta Q=TdS$ connecting heat, entropy, and temperature, and its validity is seen to depend on the existence of local equilibrium conditions.