## Thursday, 27 September 2018

### SciPost two years on

There are two reasons why we should care about the journal SciPost Physics: it practices open peer review, by publishing the exchanges between authors and reviewers, and it is free to authors and readers, at a time when academia is struggling to escape the stranglehold of predatory publishers such as Elsevier.

Two years after it was launched, SciPost Physics is alive on well, with 155 published articles at the time of this writing. The journal has managed to attract articles of high quality, some of them by well-known physicists such as Cardy, Verlinde, Seiberg, or Rychkov. The main challenges are now to attract many more authors, and sustainable funding. The journal is funded by institutional subsidies, an economic model that works for arXiv but that is rare for journals. If the finances worked out, the journal could ultimately hope to become a megajournal, and publish thousands of articles a year like PLOS One or PeerJ. For the moment, the stated aim of the “Expansion and Sustainability Drive” is to publish 500 articles a year at a cost of 200.000 euros. So each published article should cost 400 euros, a very reasonable price for a lean electronic journal: an order of magnitude more than arXiv, an order of magnitude less than Elsevier. (Unlike Elsevier, SciPost does not pay executives, lobbyists, shareholders, salespersons, lawyers, etc.)

In this post I will comment on SciPost’s workflow and platform, updating my earlier assessment in light of two years’ worth of experience. The aims are to help authors decide whether this journal suits them, to determine which features of SciPost should be emulated (or avoided) by other journals, and to provide feedback to SciPost itself.

## Wednesday, 4 July 2018

### Directive sur le droit de copie: quelques critiques

Le parlement européen doit prochainement voter un projet de directive sur le droit de copie, qui a fait l'objet de nombreuses critiques. J'en ai parlé il y a une dizaine de jours à Cédric Villani, le député (certes pas européen) de ma circonscription. D'après lui, le gouvernement français pousse pour que la directive soit adoptée. Je lui ai écrit ensuite l'email suivant, qui résume certaines critiques:

## Tuesday, 29 May 2018

Out of the 2 million academic articles that are published each year, many are not read by anyone but their authors, and most have no more than a handful of readers. For someone who writes in order to spread ideas, and does not publish just to avoid perishing, this can be quite discouraging. Of course, not everything one has to say is of interest to many people. Still, part of the problem could come from the academic article as a venue, and one may wonder whether other writing venues (such as a blog) could reach more readers.

In this post I will list various venues for scientific writing, and try to do an order-of-magnitude comparison between them. I will not simply estimate how many readers are reached: a tweet may reach many people, but it is read in seconds and can be quickly forgotten. Rather, I will try to estimate the ratio between the time spent by all readers on a text, and the time spent writing it.

## Thursday, 29 March 2018

### Write that printing money creates wealth, get published in Nature

In the debate about the carbon footprint of cryptocurrencies, Nature has recently published a one-page correspondence titled “Cryptocurrency mining is neither wasteful nor uneconomic”. This counter-intuitive claim provoked me to read the text in search of a non-trivial idea. To my shock and horror, the only basis for the claim is the trivial wordplay of using the same term “wealth” for both money and goods and services.

## Monday, 26 March 2018

### Springer threatens to go rogue, and retreats

In its negotiations with Springer, the consortium Couperin that was in charge of most French researchers’ subscriptions had been modestly asking that Springer renounce “double dipping”, i.e. does not get paid twice for the same articles – once via subscriptions, once via open access APCs. But this would have meant decreasing subscription prices by 15%, while Springer has been used to yearly increases of the order of 3-5%.

Today’s news are that negotiations have broken down, and most French researchers are set to lose legal access to most articles published by Springer on April 1st. (See CNRS’s note on the subject, in French.) In such a conflict, researchers can stand up against the publisher by
• not complaining when they lose access to journals, and getting the articles elsewhere (which nowadays mostly means at Sci-Hub),
• boycotting the publisher, i.e. not submitting articles to its journals, and not working for them as a referee or editor.
Coincidentally, I have received an invitation to referee an article for JHEP, a journal published by Springer. I have declined as follows:
Most French research institutions are set to lose access to Springer journals on April 1st. I am aware that this does not affect access to JHEP, which is covered by SCOAP3, and that in our field all articles are on arXiv anyway. However, as a matter of principle, I would like to protest Springer’s extortionate commercial practices, and to show solidarity with colleagues who will lose access to their own work. Therefore, I am suspending all new collaboration with JHEP, and I am declining to review this article.

Update on April 3rd: According to an email from Couperin, access to Springer journals has in fact not been cut off. It seems that Couperin got away with rejecting Springer's latest offer, and saying that they were willing to continue negotiating. So Springer was bluffing, and does not dare take a hard line against Couperin. If such a weak and ill-prepared consortium, with little support from researchers (who else is boycotting Springer?) can defeat Springer, pretty much anyone can.

Update on April 11th: There is now a petition called "Springer, we can do without".

Update on October 18th: An agreement has been found between Couperin and Springer. Couperin boasts that it has obtained a modest price decrease: this merely reverses a few years out of several decades of unjustified increases. And the 9-10 months where Couperin's member institutes kept access to Springer journals without a subscription, will eventually be paid retroactively. (Except for institutes who did not accept the new agreement.) Still, Springer's behaviour is not too bad for a predatory publisher. And the price decrease is in absolute terms a large amount of money, which could make much difference if it was injected into frugal publishing platforms. So I am no longer boycotting Springer.

Couperin is now negotiating with Elsevier, aiming to achieve comparable savings, and pushing for open access. Nevertheless, it is not clear to me how Couperin's deal with Springer, and negotiating stance with Elsevier, are compatible with the Plan S to which CNRS officially subscribes: if Couperin believed in Plan S, it should at least refrain from committing beyond 2020, the date at which Plan S is supposed to come into force.

## Tuesday, 20 March 2018

### The open secrets of life with arXiv

If you only think of arXiv as a tool for making articles openly accessible, consider this: in 2007, a study showed that papers appearing near the top of the daily listing of new papers on arXiv, will eventually be more cited than papers further down the list – about two times more cited. And there is a daily scramble for submitting papers as soon as possible after the 14:00 EDT deadline, in order to appear as high as possible on the listing. The effect is not as perverse as it seems, as there is no strong causal relation between appearing near the top and getting more citations. (More likely, better papers are higher in the listing because their authors want to advertise them.)

The consequences of arXiv’s systematic use in some communities are actually so deep that a speciation event has occurred among researchers, and a new species of arXivers has appeared. Here I will try to explain how arXivers live, in order to help non-arXivers understand arXivers, and have an idea of what could happen to them if the currently proliferating clones of arXiv gained widespread use.

## Thursday, 1 March 2018

### Uniqueness of Liouville theory

The original definition of Liouville theory by Polyakov in the 1980s was written in terms of a Lagrangian, motivated by applications to two-dimensional quantum gravity. In the 1990s however, Liouville theory was reformulated and solved in the conformal bootstrap approach. In this approach, the theory is characterized by a number of assumptions, starting with conformal symmetry. In order to actually define the theory, the assumptions have to be restrictive enough for singling out a unique consistent theory.

After assuming conformal symmetry, it is natural to make assumptions on the theory’s spectrum, i.e. its space of states. For any complex value of the central charge $c$, the spectrum of Liouville theory is
$\mathcal{S} = \int_{\frac{c-1}{24}}^{\frac{c-1}{24}+\infty} d\Delta\ \mathcal{V}_\Delta \otimes \bar{\mathcal{V}}_\Delta\ ,$

## Sunday, 25 February 2018

### Couperin vs Springer and Elsevier: towards less extortionate deals?

Historically, the French consortium Couperin has obtained poor results in negotiating with predatory publishers, mostly consenting to their high and increasing prices. This is not necessarily Couperin’s fault, although it does not help that Couperin’s leadership appears weak and ill-informed. Rather, this is a consequence of the basic economics of scientific publishing, with publishers systematically abusing their strong position. Even the Finnish consortium FinELib, which was determined to seek a good deal and enjoyed a fair amount of support from researchers, recently consented to one more extortionate deal with Elsevier.

However, recent developments suggest that Couperin could fare better in current and upcoming negotiations:

## Saturday, 27 January 2018

### Germany won't pay for Nature's "scientific porn", and other messages from Couperin's open science days

Earlier this week, there was a mini-workshop in Paris called Couperin’s open science days 2018. (Original title in French: Journées sciences ouverte 2018.) I followed most of it via webcast, and I will now summarize some of the salient points. The videos are available online, but most of them are in French.

#### The German way: Horst Hippler and Ralf Schimmer

The most important messages came from Germany: the country whose academic institutions have thought seriously about scientific publishing, and have organized themselves so as to drive the needed reforms. The most salient manifestation so far has been the standoff with Elsevier, and it was nice to have further details on the strategy.

## Sunday, 21 January 2018

### Will no one rid me of these tiresome Latin plurals?

The English language has inherited many scientifc words from Latin: a spectrum, an index, a torus, a formula. Then which plural forms should we use: the Latin plurals two spectra, two indices, two tori, two formulae? Or the English plurals two spectrums, two indexes, two toruses, two formulas? The Latin and the English plurals of these words are both considered correct, but the Latin plurals are more widespread. I will nevertheless argue that using Latin plurals is impractical and illogical, and should often be avoided.

## Thursday, 11 January 2018

### On single-valued solutions of differential equations

This post is about the issue of solving a nonlinear matrix equation that I raised on MathOverflow. This matrix equation determines the existence of single-valued solutions of certain meromorphic differential equations. The motivating examples are the BPZ differential equations that appear in two-dimensional CFT. For more details on these examples, see my recent article with Santiago Migliaccio on the analytic bootstrap equations of non-diagonal two-dimensional CFT.

## Thursday, 7 December 2017

### After Elsevier, should we boycott Springer?

While the ongoing “Cost of knowledge” boycott of Elsevier may not be very effective, the likely “no deal” hard exit of Germany from Elsevier subscriptions renews the boycott’s relevance, and maybe its urgency. It is indeed likely that most German universities and research institutions will lose access to Elsevier articles in 2018.

As a researcher, why would I continue publishing in journals that are in principle inaccessible to most of my German colleagues? Universal access to the literature via Sci-Hub is under increasing legal assault and should not be taken for granted. In these circumstances, boycotting Elsevier is no longer only a matter of fighting an obnoxious publisher, but also a basic necessity of ensuring that articles are accessible to their intended audience. (Unless one thinks that the intended audience is not the scientific community, but the paying Elsevier subscribers.)

Now it turns out that if I boycott Elsevier because of Germany, I may have to boycott Springer because of France.