Armas, Jay (2013). How fluids bend: the elastic expansion for higherdimensional black holes. Journal of High Energy Physics, 2013(9), 073. Springer 10.1007/JHEP09(2013)073

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Hydrodynamics can be consistently formulated on surfaces of arbitrary codimension in a background spacetime, providing the effective theory describing longwavelength perturbations of black branes. When the codimension is nonzero, the system acquires fluidelastic properties and constitutes what is called a fluid brane. Applying an effective action approach, the most general form of the free energy quadratic in the extrinsic curvature and extrinsic twist potential of stationary fluid brane configurations is constructed to second order in a derivative expansion. This construction generalizes the HelfrichCanham bending energy for fluid membranes studied in theoretical biology to the case in which the fluid is rotating. It is found that stationary fluid brane configurations are characterized by a set of 3 elastic response coefficients, 3 hydrodynamic response coefficients and 1 spin response coefficient for codimension greater than one. Moreover, the elastic degrees of freedom present in the system are coupled to the hydrodynamic degrees of freedom. For codimension1 surfaces we find a 8 independent parameter family of stationary fluid branes. It is further shown that elastic and spin corrections to (non)extremal brane effective actions can be accounted for by a multipole expansion of the stressenergy tensor, therefore establishing a relation between the different formalisms of Carter, CapovillaGuven and VasilicVojinovic and between gravity and the effective description of stationary fluid branes. Finally, it is shown that the Young modulus found in the literature for black branes falls into the class predicted by this approach  a relation which is then used to make a proposal for the second order effective action of stationary blackfolds and to find the corrected horizon angular velocity of thin black rings.
Item Type: 
Journal Article (Original Article) 

Division/Institute: 
08 Faculty of Science > Institute of Theoretical Physics 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 
UniBE Contributor: 
Saldanha Nascimento, Jácome 
Subjects: 
500 Science > 530 Physics 
ISSN: 
10298479 
Publisher: 
Springer 
Language: 
English 
Submitter: 
Esther Fiechter 
Date Deposited: 
19 Jun 2014 08:29 
Last Modified: 
17 Sep 2015 11:12 
Publisher DOI: 
10.1007/JHEP09(2013)073 
BORIS DOI: 
10.7892/boris.43496 
URI: 
https://boris.unibe.ch/id/eprint/43496 