Comment on: “Secure quantum sealed-bid auction” [Opt. Comm. 282 (2009) 1939]

In a recent paper [Opt. Comm. 282 (2009) 1939], a quantum sealed-bid auction protocol was proposed. However, in this comment, it is shown that the protocol does not complete the task of a sealed-bid auction fairly when any bidder colludes with the auctioneer.     

Erratum to “Superradiant instability for black holes immersed in a magnetic field” [Phys. Lett. B 666 (2008) 283]

This is the erratum to the Letter [R.A. Konoplya, Phys. Lett. B 666 (2008) 283]. The formulas (18)–(20) are corrected, though the conclusions of the work have not changed.     

Erratum to: “Weak corrections to gluon-induced top–antitop hadro-production” [Phys. Lett. B 639 (2006) 513]

This is an Erratum to a Letter of ours [S. Moretti, M.R. Nolten, D.A. Ross, Phys. Lett. B 639 (2006) 513]. After its publication, we have discovered a mistake in a numerical program that affects the results presented therein. We provide here the corrected version.