# Thermal nature of a generic null surface

@article{Dalui2021ThermalNO, title={Thermal nature of a generic null surface}, author={Surojit Dalui and Bibhas Ranjan Majhi and Thanu Padmanabhan}, journal={Physical Review D}, year={2021} }

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…

## One Citation

Kinematics and dynamics of null hypersurfaces in the Einstein-Cartan spacetime and related thermodynamic interpretation

- Physics
- 2022

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…

## References

SHOWING 1-10 OF 47 REFERENCES

Null Surface Thermodynamics

- Physics
- 2021

We establish that boundary degrees of freedom associated with a generic co-dimension one null surface in D dimensional pure Einstein gravity naturally admit a thermodynamical description. The null…

Thermodynamical interpretation of the geometrical variables associated with null surfaces

- Physics
- 2015

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…

Thermodynamic structure of a generic null surface in scalar-tensor theory and the zeroth law

- 2021

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

- Physics
- 2009

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

- Physics
- 2009

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…

Noncommutative Heisenberg algebra in the neighbourhood of a generic null surface

- PhysicsNuclear Physics B
- 2018

Abstract We show that the diffeomorphisms, which preserve the null nature for a generic null metric very near to the null surface, provide noncommutative Heisenberg algebra. This is the…

Einstein's equations as a thermodynamic identity: The Cases of stationary axisymmetric horizons and evolving spherically symmetric horizons

- Physics
- 2007

There is an intriguing analogy between the gravitational dynamics of the horizons and thermodynamics. In case of general relativity as well as for a wider class of Lanczos–Lovelock theories of…

Entropy of a generic null surface from its associated Virasoro algebra

- Physics
- 2016

Abstract Null surfaces act as one-way membranes, blocking information from those observers who do not cross them (e.g., in the black hole and the Rindler spacetimes) and these observers associate an…

Gravitational field equations near an arbitrary null surface expressed as a thermodynamic identity

- Physics
- 2015

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

- Physics
- 2016

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)…