Spacetimes which have been considered counterexamples to strong cosmic censorship are revisited. We demonstrate the classical instability of the Cauchy horizon inside charged black holes embedded in de Sitter spacetime for all values of the physical parameters. The relevant modes that maintain the instability, in the regime which was previously considered stable, originate as outgoing modes nea...

We propose the first economic model of censorship resistance. Early peer-to-peer systems, such as the Eternity Service, sought to achieve censorshop resistance by distributing content randomly over the whole Internet. An alternative approach is to encourage nodes to serve resources they are interested in. Both architectures have been implemented but so far there has been no quantitative analysi...

In this paper we present Dagster, a new censorship-resistant publishing scheme. Unlike previous censorship-resistant schemes, Dagster does not rely on the widespread replication of data and can even be used in a single server setting. It accomplishes this by “intertwining” legitimate and illegitimate data, so that a censor can not remove objectionable content without simultaneously removing leg...

The fundamental requirement of censorship resistance is content availability and discoverability — it should be easy for users to find and access documents. At the same time, participating storage providers should be unaware of what they are storing to preserve plausible deniability. Fulfilling these requirements simultaneously seems impossible — how does a system maintain a searchable index of...

Amateur video shot on mobile devices worldwide is helping to hold authorities to account for war crimes, human rights violations, and other abuses of power. What happens when the authenticity of that video is in doubt? The possibility of justice depends on forensic investigators who sometimes shroud their tools and methods in secrecy, inhibiting reproducibility of their results and disabling sc...

We consider (four-dimensional) gravity coupled to a scalar field with potential V(phi). The potential satisfies the positive energy theorem for solutions that asymptotically tend to a negative local minimum. We show that for a large class of such potentials, there is an open set of smooth initial data that evolve to naked singularities. Hence cosmic censorship does not hold for certain reasonab...

We report results from an exploratory analysis examining “last-minute” self-censorship, or content that is filtered after being written, on Facebook. We collected data from 3.9 million users over 17 days and associate self-censorship behavior with features describing users, their social graph, and the interactions between them. Our results indicate that 71% of users exhibited some level of last...

In his [2011], Lionel Shapiro proposes a very interesting deflationist conception of logical consequence, according to which the logical-consequence predicate applying to sentences serves as a merely expressive device allowing us to talk in a generalising way about typically non-linguistic entailment facts (just as, according to a deflationist conception of truth, the truth predicate applying t...