O(D,D) -covariant formulation of perfect and imperfect fluids in the double geometry

Lescano, Eric; Mirón-Granese, Nahuel; Sakatani, Yuho (2024) O(D,D) -covariant formulation of perfect and imperfect fluids in the double geometry. Physical Review D, 109 (8). ISSN 2470-0010

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Abstract

We study generic matter coupled to a D-dimensional supergravity using a formulation of double field theory (DFT), where all the fields are encoded in O(D, D) multiplets. We study both the case when the matter comes from a variational principle, as well as the case where the matter comes from a statistical or thermodynamic approach. For the latter, we construct the distribution function for the perfect fluid and its entropy current, which is a conserved quantity. We then include general viscous and elastic terms in the generalized energy-momentum tensor which, in the general case, lead to entropy production. We consistently deform the conservation law of the generalized entropy current and identify a particular nondissipative deformation. Using the generalized fluid model, we revisit the issue of noncovariance of perfect fluids under T-dualities and we show how to resolve it in our DFT model with matter.

Item Type:	Article
Uncontrolled Keywords:	duality; supergravity
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Theoretical Physics Division
Depositing User:	Ema Buhin Šaler
Date Deposited:	13 Apr 2026 11:40
URI:	http://fulir.irb.hr/id/eprint/11666
DOI:	10.1103/PhysRevD.109.086006

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