Andrew Strominger
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View article: Chiral soft algebras for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mi>N</mml:mi> </mml:mrow> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> gauge theory
Chiral soft algebras for gauge theory Open
Some time ago, Seiberg and Witten solved for moduli spaces of vacua parameterized by scalar vacuum expectation values in gauge theories. More recently, new vacua associated to soft theorems and asymptotic symmetries have been found. …
View article: No-Boundary State for Klein Space
No-Boundary State for Klein Space Open
Analytic continuation from $(3,1)$ signature Minkowski to $(2,2)$ signature Klein space has emerged as a useful tool for the understanding of scattering amplitudes and flat space holography. Under this continuation, past and future null in…
View article: The Black Hole Explorer: motivation and vision
The Black Hole Explorer: motivation and vision Open
Johnson, Michael D. et al.-- Full list of authors: Johnson, Michael D.; Akiyama, Kazunori; Baturin, Rebecca; Bilyeu, Bryan; Blackburn, Lindy; Boroson, Don; Cárdenas-Avendaño, Alejandro; Chael, Andrew; Chan, Chi-kwan; Chang, Dominic; Cheime…
View article: Hyperbolic vacua in Minkowski space
Hyperbolic vacua in Minkowski space Open
A bstract Families of Lorentz, but not Poincare, invariant vacua are constructed for a massless scalar field in 4D Minkowski space. These are generalizations of the Rindler vacuum with a larger symmetry group. Explicit expressions are give…
View article: Celestial leaf amplitudes
Celestial leaf amplitudes Open
A bstract Celestial amplitudes may be decomposed as weighted integrals of AdS 3 -Witten diagrams associated to each leaf of a hyperbolic foliation of spacetime. We show, for the Kleinian three-point MHV amplitude, that each leaf subamplitu…
View article: Soft algebras for leaf amplitudes
Soft algebras for leaf amplitudes Open
A bstract Celestial MHV amplitudes are comprised of non-distributional leaf amplitudes associated to an AdS 3 leaf of a foliation of flat spacetime. It is shown here that the leaf amplitudes are governed by the same infinite-dimensional so…
View article: The Black Hole Explorer: Motivation and Vision
The Black Hole Explorer: Motivation and Vision Open
We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry (VLBI) to space. BHEX will discover and measure the bright …
View article: A Celestial Dual for MHV Amplitudes
A Celestial Dual for MHV Amplitudes Open
It is shown that a 2D CFT consisting of a central charge $c$ Liouville theory, a chiral level one, rank $N$ Kac-Moody algebra and a weight $-3/2$ free fermion holographically generate 4D MHV tree-level scattering amplitudes. The correlator…
View article: Soft Algebras for Leaf Amplitudes
Soft Algebras for Leaf Amplitudes Open
Celestial MHV amplitudes are comprised of non-distributional leaf amplitudes associated to an AdS$_3$ leaf of a foliation of flat spacetime. It is shown here that the leaf amplitudes are governed by the same infinite-dimensional soft `$S$-…
View article: Celestial Leaf Amplitudes
Celestial Leaf Amplitudes Open
Celestial amplitudes may be decomposed as weighted integrals of AdS$_3$-Witten diagrams associated to each leaf of a hyperbolic foliation of spacetime. We show, for the Kleinian three-point MHV amplitude, that each leaf subamplitude is smo…
View article: Soft gravitons in the BFSS matrix model
Soft gravitons in the BFSS matrix model Open
A bstract BFSS proposed that asymptotically flat M-theory is dual to a large N limit of the matrix quantum mechanics describing N nonrelativistic D0-branes. Recent insights on the soft symmetries of any quantum theory of gravity in asympto…
View article: Conformal Correlators on the Lorentzian Torus
Conformal Correlators on the Lorentzian Torus Open
The general form of a 2D conformal field theory (CFT) correlator on a Euclidean Riemann surface, Lorentzian plane or Lorentzian cylinder is well-known. This paper describes the general form of 2- and 3-point CFT correlators on the Lorentzi…
View article: Hyperbolic Vacua in Minkowski Space
Hyperbolic Vacua in Minkowski Space Open
Families of Lorentz, but not Poincare, invariant vacua are constructed for a massless scalar field in 4D Minkowski space. These are generalizations of the Rindler vacuum with a larger symmetry group. Explicit expressions are given as squee…
View article: Logarithmic Corrections to Kerr Thermodynamics
Logarithmic Corrections to Kerr Thermodynamics Open
Recent work has shown that loop corrections from massless particles generate $\frac{3}{2}\log T_{\text{Hawking}}$ corrections to black hole entropy which dominate the thermodynamics of cold near-extreme charged black holes. Here we adapt t…
View article: Self-dual black holes in celestial holography
Self-dual black holes in celestial holography Open
A bstract We construct two-dimensional quantum states associated to four-dimensional linearized rotating self-dual black holes in (2, 2) signature Klein space. The states are comprised of global conformal primaries circulating on the celes…
View article: Deforming soft algebras for gauge theory
Deforming soft algebras for gauge theory Open
A bstract Symmetry algebras deriving from towers of soft theorems can be deformed by a short list of higher-dimension Wilsonian corrections to the effective action. We study the simplest of these deformations in gauge theory arising from a…
View article: Photon rings around warped black holes
Photon rings around warped black holes Open
The black hole photon ring is a prime target for upcoming space-based VLBI missions seeking to image the fine structure of astrophysical black holes. The classical Lyapunov exponents of the corresponding nearly bound null geodesics control…
View article: Self-Dual Black Holes in Celestial Holography
Self-Dual Black Holes in Celestial Holography Open
We construct two-dimensional quantum states associated to four-dimensional linearized rotating self-dual black holes in $(2,2)$ signature Klein space. The states are comprised of global conformal primaries circulating on the celestial toru…
View article: An Integer Basis for Celestial Amplitudes
An Integer Basis for Celestial Amplitudes Open
We present a discrete basis of solutions of the massless Klein-Gordon equation in 3+1 Minkowski space which transform as sl(2,C) Lorentz/conformal primaries and descendants, and whose elements all have integer conformal dimension. We show …
View article: Cosmic ER=EPR in dS/CFT
Cosmic ER=EPR in dS/CFT Open
In the dS/CFT correspondence, bulk states on global spacelike slices of de Sitter space are dual to (in general) entangled states in the tensor product of the dual CFT Hilbert space with itself. We show, using a quasinormal mode basis, tha…
View article: Deforming Soft Algebras for Gauge Theory
Deforming Soft Algebras for Gauge Theory Open
Symmetry algebras deriving from towers of soft theorems can be deformed by a short list of higher-dimension Wilsonian corrections to the effective action. We study the simplest of these deformations in gauge theory arising from a massless …
View article: Celestial amplitudes as AdS-Witten diagrams
Celestial amplitudes as AdS-Witten diagrams Open
A bstract Both celestial and momentum space amplitudes in four dimensions are beset by divergences resulting from spacetime translation and sometimes scale invariance. In this paper we consider a (linearized) marginal deformation of the ce…
View article: Photon Rings Around Warped Black Holes
Photon Rings Around Warped Black Holes Open
The black hole photon ring is a prime target for upcoming space-based VLBI missions seeking to image the fine structure of astrophysical black holes. The classical Lyapunov exponents of the corresponding nearly bound null geodesics control…
View article: Black holes in Klein space
Black holes in Klein space Open
A bstract The analytic continuation of the general signature (1, 3) Lorentzian Kerr-Taub-NUT black holes to signature (2, 2) Kleinian black holes is studied. Their global structure is characterized by a toric Penrose diagram resembling the…
View article: Soft Gravitons in the BFSS Matrix Model
Soft Gravitons in the BFSS Matrix Model Open
BFSS proposed that asymptotically flat M-theory is dual to a large $N$ limit of the matrix quantum mechanics describing $N$ nonrelativistic D0-branes. Recent insights on the soft symmetries of any quantum theory of gravity in asymptoticall…
View article: Holography of the photon ring
Holography of the photon ring Open
Space-based next-generation interferometers propose to measure the Lyapunov exponents of the nearly bound geodesics that comprise the photon ring surrounding the black hole M87*. We argue that these classical Lyapunov exponents equal the q…