Under the veil of citations

Academics are often ranked on citation counts’, which is considered an adequate proxy for author's quality and reputation. This paper seeks to find what is behind a cited academic / a cited article. We constructed a rich dataset from Portuguese affiliated economists and use zero inflated negative binomial model. This procedure is appropriate for count outcomes, correcting for overdispersion and excess zeros. We also use a fixed effect poisson model to accomodate authors' unobserved heterogeneity. We analyze results in detail comparing with existing literature and making some theoretical considerations around.

Quantum black holes: Nonperturbative corrections and no-veil scenario

A common belief is that further quantum corrections near the singularity of a large black hole should not substantially modify the semiclassical picture of black hole evaporation; in particular, the outgoing spectrum of radiation should be very close to the thermal spectrum predicted by Hawking. In this paper we explore a possible counterexample: in the context of dilaton gravity, we find that nonperturbative quantum corrections which are important in strong-coupling regions may completely alter the semiclassical picture, to the extent that the presumptive spacelike boundary becomes timelike, changing in this way the causal structure of the semiclassical geometry. As a result, only a small fraction of the total energy is radiated outside the fake event horizon; most of the energy comes in fact at later retarded times and there is no problem of information loss. This may constitute a general characteristic of quantum black holes, that is, quantum gravity might be such as to prevent the formation of global event horizons.

L'Éveil du XXe : organe d'information locale édité par la section communiste

1941/05/01 (N14d).

L'Éveil du XXe : organe d'information locale édité par la section communiste

Variante(s) de titre : Éveil du vingtième (Paris)

L'Éveil du XXe : organe d'information locale édité par la section communiste

1941/05/01 (N14).

L'Éveil du XXe : organe d'information locale édité par la section communiste

1941/02/20 (N11).

L'Éveil du XXe : organe d'information locale édité par la section communiste

1943/08 (N1).

L'Éveil du XXe : organe d'information locale édité par la section communiste

1941 (N16).

L'Éveil du XXe : organe d'information locale édité par la section communiste

1940/12/27 (N9).