Efimov states embedded in a quenched unitary Bose-condensed gas.

Three identical bosons at unitarity may form a series of three-body bound states whose spectrum was first given by Efimov [1]. Recently, a macroscopic population of Efimov molecules was measured for the first time in a Bose-condensed gas quenched to unitarity [2]. Through the method of cumulants [3,4], we study three-body physics in the many-body context. We report preliminary results for the spectrum of two- and three-body bound states embedded in the quenched unitary Bose-condensed gas. This study is in preparation for studying the dependence of macroscopic observables on Efimov physics. [1] V. Efimov, Sov. J. Nucl. Phys.,\textbf{ 29}, 546 (1979). [2] C. E. Klauss, X. Xie, C. Lopez-Abadia, J. P. D'Incao, Z. Hadzibabic, D. S. Jin, E. A. Cornell, Phys. Rev. Lett.\textbf{ 119} (14), 143401 (2017). [3] T. K\"{o}hler and K. Burnett, Phys. Rev. A~\textbf{65}, 033601 (2002). [4] M. Kira, Nat. Comm., 6:6624, (2015).