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Billy Abshier
Lives in Providence Village, TX
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Billy Abshier

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Finally, after 3 weeks of having no phone, I have reconnected to the on-line world! It's like I was just rescued from Gilligan's Island
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Billy Abshier

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Regardless of its ultimate validity, the philosopher side of my brain appreciates the symmetry of the argument. Absolutely fascinating. 
 
Eddies in the Space-Time Continuum

We often refer to gravity as a gravitational field because it can be described mathematically as a field. That is, each each point in space and time has certain characteristics, and they are related to each other through field equations.  For gravity, the field equations are the equations of general relativity.  Lots of physical quantities can be described as fields, including electromagnetism and quantum objects.  Fluids are also described mathematically as fields. With a flow of water or air, for example, every point has properties such as pressure and speed, and they are related by equations of fluid dynamics.

There are some similarities between these different types of fields.  Just as you can have waves in water or sound waves in air, you can have light waves in electromagnetism and gravitational waves in general relativity. But one thing that sets them apart is that water and air can experience turbulent motion, such as the swirls of smoke that rise from a campfire.  Gravity doesn’t exhibit that kind of motion. Or at least that is what we’ve generally thought.

Now a new paper on the arxiv argues that gravity can exhibit turbulence.  The paper hasn’t yet been peer reviewed, but it is an extension of work that has.  The work is based upon a connection between gravity and fluids.  Since gravity is a field, and fluids are fields, it is possible in some circumstances to treat gravity as a fluid (and fluids as a gravitational field).  This is known as gravity-fluid duality, and it is related to the holographic principle where a region of space can be described by its boundary. This doesn’t mean that gravity is a fluid (as some popular science articles are claiming) simply that it can be described as one.

This gravity-fluid duality has been known for a while, but one of the difficulties has been that fluids experienced turbulence while gravity did not.  Even computer simulations of strong-gravity interactions such as merging black holes haven’t shown any turbulence.  There have been examples of turbulence in gravitational models, but they have been for non-physical cases such as anti-de Sitter space, or 2 + 1 gravity. Now this new paper uses the gravity-fluid duality to show that gravitational turbulence can occur in the vicinity of rapidly rotating black holes.

This is still theoretical, but the authors demonstrate that such gravitational turbulence would have a distinct signature within gravitational waves. If we become successful in gravitational wave astronomy, we will be able to detect the presence (or absence) of turbulence near a rotating black hole.  Another consequence is that it further strengthens the theoretical connection between gravity and fluids.  This means that fluid turbulence can also be modeled gravitationally. That may lead to new ways to deal with turbulence in fluid models, which can be particular problematic.

Again, this still needs to be peer reviewed, but it seems that black holes really can produce eddies in the space-time continuum.

Image: Burlen Loring, Berkeley Lab
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Awesome
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She loved all of the snow today!
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Starting June 1, Joey's starts our Summer Hours. Monday-Wednesday, we will be open 4PM-10PM. Thursday and Friday, we will be open 4PM-12AM. Saturday, join us from 11AM-1AM. Finally, Sunday will be 11AM-9PM. Remember, this change does not take effect until June 1!
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Thanks for the reshare!
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I am extremely proud and honoured to be part of this.
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Our dog (Shadow) graduating Puppy Training class (shown with teacher Chris)
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“The point of all this is that when women do things, there’s a certain sort of person who wants to put them down and silence them. Not because what they’re doing is bad or wrong, but because they’re daring to do it at all. Sometimes it’s because they’re discussing sexism directly and working towards better awareness of how it pervades the culture. Other times it’s because they’re making things in fields men feel entitled to be the arbiters of, and their sheer presence neatly undermines a lot of common sexist stereotypes people don’t appreciate being made to re-think. Bonus if they have the audacity to be accomplished and good at it, too. Whoops. That’s a big old no-no, apparently.”
I'm telling you, I think the internet finally went too far this past week. Well, okay, I know not really...but it seems like, for once, people are actually paying attention to online harrassment and w...
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I would love to see more locals from the 380 corridor on G+. There are a lot of amazing people and businesses that are simply under-represented. 
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Good point, Billy.  We certainly agree.  As most people & businesses, we are a bit young on G+ -- but it's only upwards from here!
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People
In his circles
210 people
Have him in circles
88 people
Nora Roy's profile photo
Chivalry and Sorcery's profile photo
Robert Northup's profile photo
Tracy Hickman's profile photo
ahmed abbas's profile photo
Talia Johnson's profile photo
Austin Ramsey's profile photo
Cathie Abshier's profile photo
Mohammad Reza's profile photo
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Providence Village, TX
Previously
Evanston, IL - Arkadelphia, AR - Glenwood, AR
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News, statutes, pro forma, financial models, compliance memos, computer programs, and short stories are just some of the things I have written. 
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William Abshier