Egos and intensity in the search for dark matter

Voices in the dark.

In the next few weeks, the world’s most sensitive dark matter detector will begin its operations under Italy’s Gran Sasso mountain. This seems a good time to point out that it is sharing the mountain with a detector that may already have found some. What a shame, then, that what might one day be viewed as a historic result has been mired in petty name-calling.

We’ve been looking for dark matter since 1933, when the astronomer Fritz Zwicky pointed out that clusters of galaxies move in ways that seemingly defy the laws of physics. The movement made sense only if the clusters were experiencing a gravitational pull from some invisible stuff nearby.

For various reasons, mostly to do with other astronomers not liking Zwicky very much, we’ve been searching for dark matter seriously only since the 1970s. During those four decades, there has been a series of pronouncements about its discovery being only a decade away. It might now be time to take those pronouncements a little more seriously: lately, the sensitivity of detectors has been improving tenfold every two years. We must surely be on the verge of finally nailing down the existence of dark matter. If we haven’t already, that is.

Dark matter doesn’t just hold gravity clusters together – it’s everywhere. It’s right here on earth, for instance: billions of dark matter particles fly through your body every second. You won’t feel them and they won’t harm you. They don’t interact much with the stuff of our everyday reality, which is what has made them so hard to detect.

While we don’t have any concrete detections of single particles, we do seem to have a discernible signal from passing through clouds of dark matter. It was first spotted by the DAMA dark matter detector, which is based, like the new DarkSide-50 detector, deep under the mountains at Gran Sasso. The rock covering them protects the instruments from distracting sources of noise.

In 2008, DAMA’s operators announced that they had identified a signal that rose and faded with the seasons. It might have been ignored, except that this is exactly what Katherine Freese predicted for a dark matter signal in 1986. She said that the intensity of dark matter detections should depend on the time of year, because as the earth whirls round the sun and the sun moves through the Milky Way, the amount of dark matter hitting the detectors will ebb and flow. It’s rather like the difference between walking into wind-driven rain, then turning and walking the other way. In June, dark matter hits Planet Earth full in the face; in December, it’s at our back.

So, it was pretty exciting that DAMA’s detector saw this predicted pattern. It was even more exciting when another detector, CoGeNT, based in a deep underground mine in Minnesota, also saw it. It’s a shame that a third detector, Xenon, didn’t.

Xenon is also in the Gran Sasso mine and there is no love lost between the leaders of these two research efforts. CoGeNT’s Juan Collar has called Xenon’s science “pure, weapons-grade balonium”. Not content with antagonising his peers, Collar has also accused the DAMA project of “cheapening the level of our discourse to truly imbecilic levels”.

Finding dark matter is proving to be astonishingly difficult and everyone knows there’s a Nobel prize at stake, so it’s not surprising that the claws are out.

Anyway, welcome to the fray, DarkSide-50; there is definitely room for more players in this competition. Whether there is room for more egos, however, is another matter.

Inside the DarkSide-50 experiment.

Michael Brooks holds a PhD in quantum physics. He writes a weekly science column for the New Statesman, and his most recent book is At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise.

This article first appeared in the 18 February 2013 issue of the New Statesman, Iraq: ten years on

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Age verification rules won't just affect porn sites – they'll harm our ability to discuss sex

Relying on censorship to avoid talking about sex lets children down.

The British have a long history of censoring sex. In 1580, politician William Lambarde drafted the first bill to ban "licentious" and "hurtful... books, pamphlets, ditties, songs, and other works that promote the art of lascivious ungodly love". Last week, the UK government decided to have another crack at censorship, formally announcing that age verification for all online pornographic content will be mandatory from April 2018.

It is unclear at this point what this mandatory check will entail, but it's expected that you will need to submit your credit card details to a site before being allowed to access adult content (credit cards can’t be issued to under-18s).

The appointed regulator will almost certainly be the British Board of Film Classification who will have the authority to levy fines of up to £250,000 or shut down sites that do not comply. These measures are being directly linked to research conducted by the NSPCC, the Children’s Commissioner and the University of Middlesex in 2016, which surveyed more than 1,000 11 to 16-year-olds about viewing online pornography and found over half had accessed it. 

Digital minister Matt Hancock said age verification "means that while we can enjoy the freedom of the web, the UK will have the most robust internet child protection measures of any country in the world". And who can argue with that? No sane adult would think that it’s a good idea for children to watch hardcore pornography. And because we all agree kids should be watching Peppa Pig rather than The Poonies, the act has been waved through virtually unchallenged.

So, let’s put the issue of hardcore pornography to one side, because surely we are all in agreement. I’m asking you to look at the bigger picture. It’s not just children who will be censored and it’s not just Pornhub and Redtube which will be forced to age check UK viewers. This act will potentially censor any UK site that carries adult content, which is broadly defined by the BBFC as "that it was produced solely or principally for the purposes of sexual arousal".

I am a UK academic and research the history of sexuality. I curate the online research project www.thewhoresofyore.com, where academics, activists, artists and sex workers contribute articles on all aspects of sexuality in the hope of joining up conversations around sex that affect everyone. The site also archives many historical images; from the erotic brothel frescoes of Pompeii to early Victorian daguerreotypes of couples having sex. And yet, I do not consider myself to be a porn baron. These are fascinating and important historical documents that can teach us a great deal about our own attitudes to sex and beauty.

The site clearly signposts the content and asks viewers to click to confirm they are over 18, but under the Digital Economy Act this will not be enough. Although the site is not for profit and educational in purpose, some of the historical artefacts fit the definition of  "pornographic’" and are thereby liable to fall foul of the new laws.

And I’m not the only one; erotic artists, photographers, nude models, writers, sex shops, sex education sites, burlesque sites, BDSM sites, archivists of vintage erotica, and (of course) anyone in the adult industry who markets their business with a website, can all be termed pornographic and forced to buy expensive software to screen their users or risk being shut down or fined. I have contacted the BBFC to ask if my research will be criminalised and blocked, but was told "work in this area has not yet begun and so we are not in a position to advice [sic] you on your website". No one is able to tell me what software will need to be purchased if I am to collect viewers' credit card details, how I would keep them safe, or how much this would all cost. The BBFC suggested I contact my MP for further details. But, she doesn’t know either.

Before we even get into the ethical issues around adults having to enter their credit card details into a government database in order to look at legal content, we need to ask: will this work? Will blocking research projects like mine make children any safer? Well, no. The laws will have no power over social media sites such as Twitter, Snapchat and Periscope which allow users to share pornographic images. Messenger apps will still allow users to sext, as well as stream, send and receiving pornographic images and videos. Any tech savvy teenager knows that Virtual Private Network (VPN) software will circumvent UK age verification restrictions, and the less tech savvy can always steal their parents' credit card details.

The proposed censorship is unworkable and many sites containing nudity will be caught in the crossfire. If we want to keep our children "safe" from online pornography, we need to do something we British aren’t very good at doing; we need to talk openly and honestly about sex and porn. This is a conversation I hope projects like mine can help facilitate. Last year, Pornhub (the biggest porn site in the world) revealed ten years of user data. In 2016, Brits visited Pornhub over 111 million times and 20 per cent of those UK viewers are women. We are watching porn and we need to be open about this. We need to talk to each other and we need to talk to our kids. If you’re relying on government censorship to get you out of that tricky conversation, you are letting your children down.

The NSPCC report into children watching online pornography directly asked the participants about the effectiveness of age verification, and said the children "pointed out its limitations". When asked what intervention would most benefit them, this was the overwhelming response: "Whether provided in the classroom, or digitally, young people wanted to be able to find out about sex and relationships and about pornography in ways that were safe, private and credible." I suggest we listen to the very people we are trying to protect and educate, rather than eliminate. 

Dr Kate Lister researches the history of sexuality at Leeds Trinity University