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The Possible Parallel Universe of Dark Matter

The Possible Parallel Universe of Dark Matter | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
As researchers learn more about dark matter's complexities, it seems possible that our galaxy lives on top of a shadow galaxy without us even knowing it.

 

All known particles make up only a small fraction of the energy density in our universe, yet the Standard Model is extremely complicated: three forces, one Higgsed, one confining, plus quarks and leptons organized into three generations. This model—the components of the visible universe—
deviates markedly from any apparent principle of minimality. Yet, when considering the 85% of the matter in the universe that is dark, our usual response is to turn to minimal models of a cold, collisionless particle: a WIMP, perhaps, or an axion.

 

Two recent advances hint at just how much we have been missing about the dark side. In January 2012, Christoph Weniger, a physicist at the University of Amsterdam in the Netherlands, started noticing hints of a strange type of radiation around the center of our galaxy. To his excitement, he realized that the glow could be a signal of dark-matter particles smashing into each other and, in the process, transforming from something invisible to something visible. If so, it might finally be possible to go beyond simply deducing where dark matter gathers, and start learning how it actually behaves.

 

The other shoe dropped earlier this year, when a group of Harvard University theorists, including Lisa Randall and JiJi Fan, formulated a new theory of dark matter. One of the oddest things about Weniger’s detection, Randall notes, is that it was possible at all. “The signal would be too small for you to see under most reasonable models of dark matter,” she says. But Randall and her collaborators realized they could tidily explain the observation if there were a second type of dark matter out there: one that is not as diffuse as the dominant component of dark matter, but can interact with itself, just like visible matter. Clumps of this interacting kind of dark matter could form a disk, collapsing into a plane that could produce a correspondingly concentrated signal like the one Weniger saw.

 

Acknowledging that dark matter might have some of the same kind of diversity as visible matter may seem a minor adjustment. But it’s one that has, as Randall narrates in an excited staccato, “super-dramatic consequences.” If one variety of dark matter can clump together, it could form a panoply of previously unimagined dark structures. It could ball up into dark stars surrounded by dark planets made of dark atoms. In the most extravagant leap of possibility, this new kind of dark matter might even allow the existence of dark life.

 

Getting mainstream scientists to move past their light-matter chauvinism and take that shadow world seriously will require some highly convincing evidence. Weniger frets that the Fermi observations are too ambiguous to do the trick. “What one needs is more data with the same experiment to establish that the signal is there,” he says. 

 

Harvard astronomer Douglas Finkbeiner is making an independent analysis of the Fermi data and likewise is finding that his results hang halfway between verification and falsification. “It’s the most frustrating possible outcome,” he sighs. “One option is that the signal is just not as bright as we thought it was.” 

 

Randall is ready to forge ahead regardless of the fate of this particular observation. “The gamma ray line may not stay, but this just turns out to be independently such an interesting scenario, with so many interesting implications,” she says. And if our galaxy really does live right on top of a shadow galaxy, there are other ways to prove it.

 

Researchers are working on a new European space observatory called Gaia, scheduled to launch this autumn, which should perform a particularly telling test. Gaia will map the locations and velocities of about 1 billion stars within the Milky Way. Searching for anomalous motions could shade in the outlines of an invisible, dense disk of dark matter pulling on those stars. 

 

 


Via Dr. Stefan Gruenwald
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Miro Svetlik's curator insight, August 12, 2013 3:50 AM

This is a nice one and I like the idea, however I am asking myself what features are causing dark world weigth to be so much more than barryonic matter? Symmetrical anti particles idea is condemned to the fairyland.

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Google développe un outil de traduction vocale universel, en simultané

Google développe un outil de traduction vocale universel, en simultané | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it

(Relaxnews) - Google affirme avoir obtenu des résultats quasi parfaits lors des phases de test de son traducteur vocal en temps réel. Aucune indication n’a cependant été donnée quant au lancement du produit fini.

La fonctionnalité Google traduction a rendu service à bon nombre d'hommes d'affaires en déplacement, expatriés et vacanciers peinant à se faire comprendre sur leur lieu de villégiature. Mais l'outil de traduction web et mobile dépend entièrement de la capacité de l'utilisateur à manier le clavier si bien que, sans possibilité de copier-coller un texte écrit, la traduction d'une langue dont les caractères lui sont étrangers demeure parfois problématique.

Pour y remédier, Google a déjà pensé à une fonctionnalité de saisie manuscrite. Lancée le 24 juillet, elle permet de "dessiner" des caractères en touchant l’écran ou à l'aide de la souris. Un bon début qui appelle l’étape suivante : la disparition totale du clavier.

 

L'entreprise développe un outil de traduction vocale. Dans une interview accordée au Times, Hugo Barra vice-président du management produit Android a déclaré que les prototypes actuels permettaient un résultat quasi-"fiable à 100%" : pour certaines des combinaisons de langues, en conditions de laboratoire (sans fond sonore et par le biais d’une connexion internet optimale), deux personnes parlant des langues totalement différentes peuvent communiquer via le système


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TimeFreeze, créer un bac à sable virtuel pour tester des applications - Websourcing.fr

TimeFreeze est une application gratuite qui permet de créer un environnement protégé (une sandbox) dans Windows afin d’y faire tourner des logiciels dont on n’est pas sûr, comme les programmes téléchargés sur des sites sans réputation.
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Office Timeline, créer des plannings visuels avec PowerPoint - Websourcing.fr

Office Timeline, créer des plannings visuels avec PowerPoint - Websourcing.fr | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
Une image vaut mieux que des explications. Pour une communication efficace, une belle présentation n’a pas son pareil. Les aficionados de PowerPoint le savent bien et réalisent des présentations toujours plus sophistiqués.
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Windows 8.1 Expected to Arrive in October

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Windows 8.1 is expected to roll out in October.
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3-D Cosmic Map Helps You Wrap Your Brain Around the Universe's Weirdness | Wired Science

3-D Cosmic Map Helps You Wrap Your Brain Around the Universe's Weirdness | Wired Science | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it

As someone who writes about astronomy, I know that figuring out the universe is tough. There’s all these weird things — dark matter, quasars, cosmological expansion — that are genuinely difficult to get a good handle on.

 

So anything that helps come to terms with how the cosmos works is commendable, and for that reason I really like this new 3-D map assembled by scientists working with the National Astronomical Observatory in Japan using data from the Subaru Telescope. The graphic places more than 1,000 galaxies in their respective positions out in the universe, taking the flat starry night sky that we normally experience and giving us a new perspective. These galaxies are between 8 and 10 billion years old.

 

 

There’s something actually user-friendly about the scale, which covers a mere 2.5 billion light-years in distance backwards and 600 million light-years across (yes, that’s huge but this is the universe we’re talking about). Other 3-D cosmic maps have plotted out some 500 million objects at distances up to 7 billion light-years from Earth. While cool-looking, you tend to miss the trees for the forest when inundated by so much information.

 

So what are we looking at?

 

Click headline to read more--


Via Chuck Sherwood, Senior Associate, TeleDimensions, Inc
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Google Chromecast Will Change How You Watch Television | Social Media Today

Google Chromecast Will Change How You Watch Television | Social Media Today | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
  Screen shot 2013-07-31 at 2.19.30 PM Two weeks ago, Google began selling Chromecast. Just plug it into the HDMI port on your television and wirelessly stream content to your television from your computer, Android or iOS device.
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NASA X-ray spots amazing exoplanet eclipse

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NASA's Chandra X-ray Observatory captures the first-ever X-ray of an exoplanet passing in front of its parent star in a system that is 63 light-years from Earth. Read this article by Nick Statt on CNET News.
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Rescooped by Philippe Trebaul from #EAv (e)LOCRIS - Is Empire Avenue worth it?
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Flagship Radio

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The Big Streamer 24 hours a day 7 days a week internet radio at its finest

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'John L Evans''s curator insight, July 27, 2013 10:22 PM

#EAv (e)LOCRIS @LOCRIS | 

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Top Ten Image Sharing Websites

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list of top image sharing and hosting websites, best image hosting sites, photo sharing websites, photo upload sites, online photo picture sharing websites
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www.bretagne-environnement.org - Bretagne Environnement

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, Bienvenue sur le portail d'accès à la connaissance sur l'environnement en Bretagne. Projet collaboratif, il a pour objectifs de faciliter l'accès aux données et de vulgariser l'information afin de développer la culture environnementale.

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algrappe's curator insight, August 7, 2013 8:24 AM

Un exemple à suivre...

 

D'Dline 2020 ✏ 's curator insight, August 11, 2013 9:46 AM

Bravo Pactrice pour cette belle initiative collaborative !

Rescooped by Philippe Trebaul from Réalité augmentée sur mobile (Smartphones et tablettes)
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Réalité augmentée : où en est-on ?

Réalité augmentée : où en est-on ? | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
Depuis environ deux ans, les projets de « réalité augmentée » fleurissent sur le net. Applications, jeux vidéo, Google Glass… Qu’appelle-t-on réalité augmentée ? Que changera cette nouvelle technologie à notre quotidien ?

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3-D Cosmic Map Helps You Wrap Your Brain Around the Universe's Weirdness | Wired Science

3-D Cosmic Map Helps You Wrap Your Brain Around the Universe's Weirdness | Wired Science | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it

As someone who writes about astronomy, I know that figuring out the universe is tough. There’s all these weird things — dark matter, quasars, cosmological expansion — that are genuinely difficult to get a good handle on.

 

So anything that helps come to terms with how the cosmos works is commendable, and for that reason I really like this new 3-D map assembled by scientists working with the National Astronomical Observatory in Japan using data from the Subaru Telescope. The graphic places more than 1,000 galaxies in their respective positions out in the universe, taking the flat starry night sky that we normally experience and giving us a new perspective. These galaxies are between 8 and 10 billion years old.

 

 

There’s something actually user-friendly about the scale, which covers a mere 2.5 billion light-years in distance backwards and 600 million light-years across (yes, that’s huge but this is the universe we’re talking about). Other 3-D cosmic maps have plotted out some 500 million objects at distances up to 7 billion light-years from Earth. While cool-looking, you tend to miss the trees for the forest when inundated by so much information.

 

So what are we looking at?

 

Click headline to read more--


Via Chuck Sherwood, Senior Associate, TeleDimensions, Inc
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84% des Français estiment que la pub online est un contenu parasite - Websourcing.fr

84% des Français estiment que la pub online est un contenu parasite - Websourcing.fr | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
L’épisode Free, avec le blocage par défaut des publicités online depuis la box Revolution, avait permis de se rendre compte à quel point le secteur avait mauvaise presse. Une étude réalisée par Adoulike et l’Ifop vient confirmer cet état de fait.
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Benubird PDF, un gestionnaire avancé de documents - Websourcing.fr

Benubird PDF, un gestionnaire avancé de documents - Websourcing.fr | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
J’ai souvent répété sur ce blog que la gestion des documents est un vrai casse-tête : rangement, classement, duplication, suppression … Il existe un grand nombre de bonnes solutions comme Elyse, Nemo Documents ou encore Tabbles.
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Comment localiser un téléphone Android perdu ou volé ?

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Vous avez perdu votre smartphone ou votre tablette Android ?
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Rescooped by Philippe Trebaul from Selling your technologies around the world
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La reconnaissance des ingénieurs français aux Etats-Unis s'améliore

La reconnaissance des ingénieurs français aux Etats-Unis s'améliore | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
Le diplôme hexagonal est désormais l'équivalent du master américain, ce qui devrait faciliter la poursuite de stages et de doctorats outre-Atlantique.

Via Ronald Bannon MBA, C.Adm., FCMC
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Ronald Bannon MBA, C.Adm., FCMC's curator insight, August 10, 2013 6:08 PM

C'est une bonne nouvelle pour les 227 écoles d'ingénieurs françaises : leur diplôme est désormais reconnu aux Etats-Unis au même grade qu'un "master of science" (bac + 5). Il existait, jusqu'alors, une confusion entre la formation à la française et le terme "engineer" qui, aux Etats-Unis, correspond plutôt à un super-technicien détenteur d'un "bachelor of science" (bac + 4), c'est-à-dire plutôt à une licence au sens européen du terme (bac + 3).

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Comment vraiment profiter de la nuit des étoiles

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Ce week-end, regardez le ciel : les 9, 10 et 11 août, la Terre traversera un nuage de grains d'une comète voisine, ce qui provoquera une pluie d'étoiles filantes. Quelques conseils pour profiter au maximum du spectacle.
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Google Chromecast Will Change How You Watch Television | Social Media Today

Google Chromecast Will Change How You Watch Television | Social Media Today | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
  Screen shot 2013-07-31 at 2.19.30 PM Two weeks ago, Google began selling Chromecast. Just plug it into the HDMI port on your television and wirelessly stream content to your television from your computer, Android or iOS device.
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Advertising Techniques

Advertising Techniques | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
Advertising Techniques The Most Cost-Efficient Methods to Promote your Products

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'John L Evans''s curator insight, July 27, 2013 10:36 PM

#EAv (e)LOCRIS @LOCRIS | 

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Glimpse brings social discovery leaders back to SF

Glimpse brings social discovery leaders back to SF | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
Save the date! Glimpse, the social discovery conference, will make its long awaited return to San Francisco on June 12. With VentureBeat as a premier media sponsor, readers can get exclusive access...

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'John L Evans''s curator insight, April 19, 2013 3:21 PM

#EAv (e)LOCRIS @LOCRIS | 

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The Other Side of Blue, an album by Stanford Mixed Company

The Other Side of Blue, an album by Stanford Mixed Company | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it
The Other Side of Blue is a 15 track album by Stanford Mixed Company.
Show your support on Loudr and download your choice of MP3, FLAC, and Apple Lossless formats.
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Rescooped by Philippe Trebaul from Veille informationnelle, curation,intelligence économique
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Réaliser une veille efficace en utilisant trois technologies du net : la curation, la syndication et l'agrégation

Réaliser une veille efficace en utilisant trois technologies du net : la curation, la syndication et l'agrégation | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it

Google reader (et donc ses "bundle" pour mettre plusieurs RSS en un) comme vous le savez certainement va disparaître d'ici quelques jours et beaucoup de challenger s'empressent de proposer une solution de remplacement. Bien que j'apprécie particulièrement le lecteur de flux RSS de Google j'avoue ne pas toujours être satisfait de son système d'alerte (Google Alerts) en grande partie par la limite même des mots clés. En effet, si la thématique "marque employeurs" m'intéressent le mots clés "marque employeurs" est parfois trop restrictif. Par exemple, d'autres articles similaires indiqueront RH 2.0, RSE (réseaux sociaux d'entreprise), Job 2.0, objectif marque RH..., à moins de créer autant d'alertes que de mots clés, cela ne me semble pas très efficace.

Je vous propose donc ici une méthode qui vous permettra de vous réconcilier avec les outils de curation, de syndication et d'agrégation...


Via Elodie Garguilo, EASI-ie, Stéphane Cottin, Elena Pérez, Thierry Guesdon, Michelle Laurissergues, algrappe
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Griselda Sassola's comment, August 2, 2013 2:23 PM
merci du partage
Gilles Le Page's comment, September 9, 2013 1:05 AM
merci pour cette explication claire et utile :-)
Christine Assicot's curator insight, June 11, 2014 8:25 AM

outils de veille et partage

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Bilan énergétique de la France pour 2012 - Ministère du Développement durable

Bilan énergétique de la France pour 2012 - Ministère du Développement durable | JOIN SCOOP.IT AND FOLLOW ME ON SCOOP.IT | Scoop.it

Via ARPE, algrappe
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