# Physical Review Letters (APS)

 2019-03-2218:16 All Tree Amplitudes of 6D (2,0) Supergravity: Interacting Tensor Multiplets and the K3 Moduli Space / Heydeman, Matthew ; Schwarz, John H. ; Wen, Congkao ; Zhang, Shun-Qing We present a twistorlike formula for the complete tree-level $S$ matrix of six-dimensional (6D) (2,0) supergravity coupled to 21 Abelian tensor multiplets. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.111604 arXiv:1812.06111 Fulltext: PDF XML; 2019-03-2218:16 Causality and Loop-Tree Duality at Higher Loops / Runkel, Robert ; Szőr, Zoltán ; Vesga, Juan Pablo ; Weinzierl, Stefan We relate an $l$-loop Feynman integral to a sum of phase space integrals, where the integrands are determined by the spanning trees of the original $l$-loop graph. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.111603 arXiv:1902.02135 Fulltext: XML PDF; 2019-03-2218:16 Weyl Invariance of String Theories in Generalized Supergravity Backgrounds / Fernández-Melgarejo, José J. ; Sakamoto, Jun-ichi ; Sakatani, Yuho ; Yoshida, Kentaroh We revisit Weyl invariance string theories in generalized supergravity backgrounds. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.111602 arXiv:1811.10600 Fulltext: XML PDF; 2019-03-2218:16 Holographic Entanglement of Purification from Conformal Field Theories / Caputa, Pawel ; Miyaji, Masamichi ; Takayanagi, Tadashi ; Umemoto, Koji We explore a conformal field theoretic interpretation of the holographic entanglement of purification, which is defined as the minimal area of the entanglement wedge cross section. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.111601 arXiv:1812.05268 Fulltext: XML PDF; 2019-03-2218:16 Early Cosmological Period of QCD Confinement / Ipek, Seyda ; Tait, Tim M. P. If the strong coupling is promoted to a dynamical field-dependent quantity, it is possible that the strong force looked very different in the early Universe. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.112001 arXiv:1811.00559 Fulltext: PDF XML; 2019-03-1518:16 Evidence of a Resonant Structure in the ${e}^{+}{e}^{-}\to {\pi }^{+}{D}^{0}{D}^{*-}$ Cross Section between 4.05 and 4.60 GeV / Ablikim, M. ; Achasov, M. N. ; Ahmed, S. ; Albrecht, M. ; et al The cross section of the process ${e}^{+}{e}^{-}\to {\pi }^{+}{D}^{0}{D}^{*-}$ for center-of-mass energies from 4.05 to 4.60 GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.102002 arXiv:1808.02847 Fulltext: XML PDF; 2019-03-1322:16 Primordial Black Holes from the QCD Axion / Ferrer, Francesc ; Masso, Eduard ; Panico, Giuliano ; Pujolas, Oriol ; et al We propose a mechanism to generate primordial black holes (PBHs) that is independent of cosmological inflation and occurs slightly below the QCD phase transition. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.101301 arXiv:1807.01707 Fulltext: XML PDF; 2019-03-1318:16 Thermal Emission from Semiclassical Dynamical Systems / Morita, Takeshi Recently the bound on the Lyapunov exponent ${\lambda }_{L}\le 2\pi T/\hslash$ in thermal quantum systems was conjectured by Maldacena, Shenker, and Stanford. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.101603 arXiv:1902.06940 Fulltext: PDF XML; 2019-03-1122:16 Spinor-Helicity Formalism for Massless Fields in ${\mathrm{AdS}}_{4}$ / Nagaraj, Balakrishnan ; Ponomarev, Dmitry In this Letter, we suggest a natural spinor-helicity formalism for massless fields in four-dimensional anti–de Sitter space (${\mathrm{AdS}}_{4}$). [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.101602 arXiv:1811.08438 Fulltext: XML PDF; 2019-03-1118:16 Polarized Scattering Equations for 6D Superamplitudes / Geyer, Yvonne ; Mason, Lionel We introduce a spinorial version of the scattering equations, the polarized scattering equations, that incorporates spinor polarization data. [...] Published in Physical Review Letters 122 (2019) 10.1103/PhysRevLett.122.101601 arXiv:1812.05548 Fulltext: PDF XML;