Optomechanics and quantum phase of the Bose-Einstein condensate with the cavity mediated spin-orbit coupling.

We investigated the optomechanical dynamics and explored the quantum phase of a Bose-Einstein condensate in a ring cavity. The interaction between the atoms and the cavity field in the running wave mode induces a semiquantized spin-orbit coupling (SOC) for the atoms. We found that the evolution of the magnetic excitations of the matter field resembles that of an optomechanical oscillator moving in a viscous optical medium, with very good integrability and traceability, regardless of the atomic interaction. Moreover, the light-atom coupling induces a sign-changeable long-range interatomic interaction, which reshapes the typical energy spectrum of the system in a drastic manner. As a result, a new quantum phase featuring a high quantum degeneracy was found in the transitional area for SOC. Our scheme is immediately realizable and the results are measurable in experiments.

Is laparoscopic lavage safe in purulent diverticulitis versus colonic resection? A systematic review and meta-analysis.

BACKGROUND: Diverticulitis is one of the most common gastrointestinal diseases in western population. Colonic resection is recommended by international guidelines as a routinely used technique for purulent diverticulitis. Laparoscopic lavage was introduced as a non-resection alternative. The studies available so far have shown contradictory results. This meta-analysis aims to compare laparoscopic lavage versus colonic resection in patients with Hinchey Ⅲ-Ⅳ diverticulitis. METHODS: We did a systematic review of articles published before March 20, 2019, with no language restriction by searching PubMed, Cochrane library, EMBASE databases, clinicaltrials.gov, and Google Scholar databases. We included all RCTs and cohort studies comparing outcomes between patients with Hinchey Ⅲ-Ⅳ diverticulitis undergoing laparoscopic lavage versus colonic resection. Important outcomes were mortality, complications, length of stay, readmission and reoperation rates. We combined data to assess the outcomes using DerSimonian and Laird random-effects model. RESULTS: A total of 569 patients with diverticulitis of which more than 80% were Hinchey Ⅲ were enrolled from 3 RCTs and 5 cohort studies. Laparoscopic lavage was associated with shorter operative time (WMD -78.9, 95%CI -100.58 to -57.11, P < 0.0001) and total postoperative hospital stay (WMD -7.62, 95%CI -11.60 to -3.63, P = 0.0002) but a higher rate of intra-abdominal abscess (OR 2.69, 95%CI 1.39 to 5.21, P = 0.0032) and secondary peritonitis (OR 5.30, 95%CI 1.91 to 14.73, P = 0.0014). CONCLUSION: Laparoscopic lavage for patients with Hinchey Ⅲ to Ⅳ diverticulitis does provide similar mortality, shorter operative time and hospital stay. However, the evidence so far suggests that it might be inadequate for sepsis control and may result in more unplanned reoperations. Further studies are needed to standardize the formal indication for laparoscopic lavage.