Journey to the center of the fuzzball

Chen, Fang; Michel, Ben; Polchinski, Joseph; Puhm, Andrea

doi:10.1007/jhep02(2015)081

Cited by 28 publications

(32 citation statements)

References 49 publications

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“…This line of enquiry complements the fuzzball program [56][57][58][59][60][61][62]; for recent work in this area, see e.g. [63][64][65][66][67][68][69][70].…”

Section: Jhep01(2015)071mentioning

confidence: 81%

Effect of the deformation operator in the D1D5 CFT

Carson

Hampton

Mathur

et al. 2015

J. High Energ. Phys.

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The D1D5 CFT gives a holographic dual description of a near-extremal black hole in string theory. The interaction in this theory is given by a marginal deformation operator, which is composed of supercharges acting on a twist operator. The twist operator links together different copies of a free CFT. We study the effect of this deformation operator when it links together CFT copies with winding numbers M and N to produce a copy with winding M +N , populated with excitations of a particular form. We compute the effect of the deformation operator in the full supersymmetric theory, firstly on a RamondRamond ground state and secondly on states with an initial bosonic or fermionic excitation. Our results generalize recent work which studied only the bosonic sector of the CFT. Our findings are a step towards understanding thermalization in the D1D5 CFT, which is related to black hole formation and evaporation in the bulk.

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“…This line of enquiry complements the fuzzball program [56][57][58][59][60][61][62]; for recent work in this area, see e.g. [63][64][65][66][67][68][69][70].…”

Section: Jhep01(2015)071mentioning

confidence: 81%

Effect of the deformation operator in the D1D5 CFT

Carson

Hampton

Mathur

et al. 2015

J. High Energ. Phys.

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“…The specific way in which these instabilities saturate through vortex formation is a feature of nonlinear superfluid hydrodynamics rather than gravity, but the generic expectation of nonlinear quantum gravity is that it may also dramatically influence the interior structure of a black hole. The quasi-stationary epoch of our simulation indeed resembles the string-theoretic fuzzball scenario [2,38], in which the smooth spacetime of classical general relativity likewise only survives outside the horizon.…”

Section: Discussionmentioning

confidence: 74%

Quasi-steady radiation of sound from turbulent sonic ergoregions

2018

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Sonic Hawking radiation has recently been observed in dilute Bose-Einstein condensates (BECs), but it remains an open question whether this landmark achievement of atomic physics can lead to new insights into the effects on Hawking radiation of nonlinear back-reaction and new short-distance physics, as was originally hoped by Unruh when he introduced the sonic analogy. Furthermore, studies of sonic analog black holes have until now concentrated on (1+1)-dimensional scenarios, but Unruh's sonic analogy for curved spacetime is only valid in more than one spatial dimension. We therefore model the evolution of a (2+1)-dimensional sonic black hole in a dilute BEC, over a long enough time to let the initial Corley-Jacobson instabilities saturate in vortex production and give way to a long-lived quasi-stationary state. In this quasi-equilibrium state we find the initial laminar ergoregion replaced by a turbulent zone that steadily radiates sound, but with a non-thermal power spectrum.Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.1 By this term we mean all effects resulting from the full nonlinear theory that act back on the black hole and that are neglected in Hawking's derivation. In the context of analog gravity in BEC mean-field theory the full theory is the nonlinear Gross-Pitaevskii theory; neglecting the nonlinear back-reaction corresponds to the linear Bogoliubov approximation. 2 From [3] above: 'This system forms an excellent theoretical laboratory where many of the unknown effects that quantum gravity could exert on black hole evaporation can be modeled. ... At distances of 10 −8 cm, the assumptions ... of a smooth background flow are no longer valid just as in gravity one expects the concept of a smooth space-time on which the various relativistic fields propagate to break down at scales of 10 −33 cm. Furthermore, the phonons emitted are quantum fluctuations of the fluid flow and thus affect their own propagation in exactly the same way that graviton emission affects the space-time on which the various relativistic fields propagate.' In the last sentence Unruh cannot really have meant that quantum gravity must be exactly like hydrodynamics, but rather just that nonlinear back-reaction of some kind will surely occur in both quantum gravity and hydrodynamics-and that this is a reason for pursuing analog experiments.

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“…It is sometimes stated that since we cannot understand generic states in a reliable supergravity description, it is unclear what we can learn from fuzzballs (see e.g. [58,76]). This is a misconception: what we learn is how the no hair results can be bypassed in string theory to yield states where the would-be interior of the black hole is not a vacuum region, and there is no region that is causally disconnected from future infinity.…”

Section: Discussionmentioning

confidence: 99%

“…It has been noted that in the study of two-charge microstates there are regimes in which the supergravity approximation no longer holds due to some degree(s) of freedom beyond the supergravity sector becoming light [18,58]. 10 In that case the correct description is of course to incorporate correctly the relevant light degrees of freedom, which can be done either in the same duality frame or by changing duality frame.…”

Section: The Limit From Non-generic To Generic Statesmentioning

confidence: 99%

The fuzzball nature of two-charge black hole microstates

Mathur

Turton

2019

Nuclear Physics B

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It has been suggested by A. Sen that the entropy of two-charge supersymmetric bound states in string theory should be accounted for by adding the entropy of source-free horizonless supergravity solutions to the entropy associated with the horizons of small black holes. This would imply that the entropy arises differently depending on the duality frame: in the D1-D5 frame one would count source-free horizonless solutions, while in the NS1-P frame one would compute the area of a horizon. This might lead to the belief that the microstates are described by fuzzball solutions in the D1-D5 duality frame but by a black hole with a horizon in the latter. We argue that this is not the case, and that the microstates are fuzzballs in all duality frames. We observe that the scaling argument used by Sen fails to account for the entropy in the D1-P and other duality frames. We also note that the traditional extremal black hole solution is not a complete string background, since finite-action paths connect the exterior near-horizon extremal throat to the region inside the horizon, including the singularity. The singularity of the traditional black hole solution does not give a valid boundary condition for a fundamental string; correcting this condition by resolving the singularity modifies the black hole to a fuzzball with no horizon. We argue that for questions of counting states, the traditional black hole solution should be understood through its Euclidean continuation as a saddle point, and that the Lorentzian states being counted are fuzzballs in all duality frames. arXiv:1811.09647v1 [hep-th]

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Journey to the center of the fuzzball

Cited by 28 publications

References 49 publications

Effect of the deformation operator in the D1D5 CFT

Effect of the deformation operator in the D1D5 CFT

Quasi-steady radiation of sound from turbulent sonic ergoregions

The fuzzball nature of two-charge black hole microstates

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