Maths HEP Lunchtime Seminars: Quantum string Bethe ansatz vs semiclassical string in AdS_5 x S^5
23 February 2006 13:00 in CM221
"We briefly review the ideas behind the construction of the quantum string Bethe equations which are supposed to describe the spectrum of quantum strings in the AdS_5xS^5 geometry. Using these equations, we compute quantum corrections to the energy of classical large strings and compare the result with the predictions of a semi-classical string quantisation. We show that, while the analytic terms in the corrections are correctly reproduced (up to 3-loop order), the nonanalytic terms present in the semi-classical string results are missed by the proposed quantum string Bethe equations. The nonanalytic terms discovered in the string result demonstrate that the (in)famous 3-loop "discrepancy" between gauge and string theories is more serious, manifesting itself in a whole tower of "missed" terms in the gauge theory."
Talk at 1 pm in CM 105. Note unusual day and location.