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Jorge Sepúlveda
Attended George Washington University
Lives in Washington, DC
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No sé si ya se enteraron, pero re-abrieron Map Maker.
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Could We Ever Build A Time Machine?

In fiction there are lots of ways to travel through time, from reaching 88 miles per hour in a DeLorean to walking through a circle of ancient Scottish stones. While the idea of time travel is centuries old, it had no basis in reality. But when Einstein developed his gravitational theory of general relativity, some physicists began to wonder if time travel might actually be possible.

One of the central ideas of general relativity is that there is no cosmic clock. While we always experience time at a normal rate, our rate can seem faster or slower relative to another observer. The relations between space and time are distorted by the presence of mass, and for objects such as black holes that distortion can be extreme. So could time be warped in such a way that it loops back on itself? In the 1970s, some physicists began to study this question in a serious way. Not as a serious effort to build a time machine, but as a way to explore the broader aspects of relativity.

One of the we can study the behavior of space and time is through what are known as light cones. Imagine a flash of light at a single point. The light would travel away from that point in all directions, so that the flash of light is an expanding sphere. Since nothing can travel faster than the speed of light, then that expanding sphere marks the limit of your influence. In general, you can’t move outside that sphere, because you can’t travel faster than light. Since it’s difficult to visualize 4-dimensional spacetime, we often imagine space as a two-dimensional surface, like a sheet of paper, and time as being the third dimension. You can imagine it as a stack of paper, with a cartoon drawing on each page, then flipping through the drawings would make them appear to move. Each sheet of paper would be a moment in time, and different pages in the stack of paper would be different moments in time. The only difference is that time is a continuum rather than discrete instants. In this visualization, an expanding sphere of light would start at a point, and with each higher page would be a larger and larger circle. If you flipped through the pages you would see an expanding circle of light. If instead you could see through the paper and just look at the circles, then you would see they form a cone starting at a particular point. This is known as a light cone, and it defines the limit of influence of an object at the point. An object at the starting point cannot influence anything outside of that light cone, nor can it ever move beyond the limit of that light cone.

The path of an object that stays within the light cone is called “timelike,” since it follows the motion of the object through time. Relativity requires that the path of all objects be timelike. So in general relativity the question becomes whether light cones can be warped in such a way that the timelike path of an object connects with its own past. If you found yourself in such a wibbly-wobbly spacetime it would be possible to meet your younger self. Such a loop is known as a closed timelike curve (CTC), and would be an actual time machine.

Interestingly, CTCs are absolutely possible within the theory of general relativity. One place where CTCs appear is in a solution to Einstein’s gravity equations known as the Gödel universe. This is a general relativistic description of a universe with an inherent rotation to it. Of course we know observationally that our universe doesn’t have such an inherent rotation, so the Gödel model doesn’t match reality. CTCs also appear inside a rotating black hole. A rotating mass causes space and time to swirl around it a bit (an effect known as frame dragging). Once you are within the event horizon of the black hole this swirling becomes strong enough there are CTCs. But this is only true if there is a singularity within the black hole, and its most likely that quantum physics prevents such a singularity from forming.

It doesn’t look like time machines occur naturally, so what about creating an artificial one? In the 1980s, Kip Thorne proposed using a wormhole as a time machine. Wormholes are purely hypothetical, and if they did exist they would collapse before you could travel through one. But Thorne found that if you could magically prevent a wormhole from collapsing, it could be used to create a time machine. Thorne’s model was simply a “what-if” scenario intended to test the limits of general relativity, but others such as Ron Mallett think it might be possible. Mallet has found a solution to general relativity that allows for CTCs without an event horizon. What Mallett has shown is that light can curve space and time in the same way as mass. By creating a rotating ring of laser light it is possible to distort space and time in a way similar to the way it is distorted by the rotating mass of a black hole, but without the black hole. This, he argues, opens the door to the possibility of creating a time loop. Critics have pointed out that Mallet’s solution still contains a singularity, so it isn’t a valid physical solution, but Mallett argues the singularity in his solution is an artifact that doesn’t affect the physics.

As for who’s right, time will tell. It’s easy to create a theoretical time machine within general relativity, the physics of matter and energy seem to prevent the creation of a real time machine. So could we ever build a time machine? Almost certainly not.

But that’s not a no.

Paper: Ronald L. Mallett. The Gravitational Field of a Circulating Light Beam. Foundations of Physics, Vol. 33, No. 9 (2003).
When Einstein developed his gravitational theory of general relativity, some physicists began to wonder if time travel might actually be possible.
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Victorian Townhouse in London Gets a Classy Contemporary Extension

http://www.decoist.com/2015-02-19/victorian-townhouse-modern-extension-london/

Giving a new lease of life to an old and dreary Victorian Townhouse that was short on space, the latest extension and refurbishment project carried out by DOS Architects steals the show with its elegant blend of the old and the new.

#Architecture #InteriorDesign #Decor #ArchitecturePhotos
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At home.
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Residence on the Edge of Sunset Plaza Drive

This contemporary residence perched on the edge of Sunset Plaza Drive, West Hollywood was designed by GWdesign, outfitted with lavish finishes to evoke a European flare.

http://interiorzine.com/2015/03/11/contemporary-residence-on-the-edge-of-sunset-plaza-drive/

#interiordesign #homedecor #architecture #decor #home  
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Lol!
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Cheezburger.com - Crafted from the finest Internets.
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Entre Bombas Nucleares y Corazones 

Como alomejor ya saben, el presidente de EEUU tiene la capacidad de mandar bombas nucleares cuando él entienda que sea necesario. Solo él puede utilizar los famosos códigos de lanzamiento (nuclear codes) para dar permiso. Como no se sabe cuándo será necesario utilizar fuerza nuclear, cuando el presidente está de viaje, un asistente anda con él en todo momento, cargando un maletín (conocido también como la bola de futbol atómica) con los códigos de lanzamiento. Un ataque nuclear es catastrófico y para muchos, cruel e innecesario. Ya vimos las repersuciones de estos ataques en Hiroshima y Nagasaki. Por esto, la decisión de usar armas nucleares no debe ser algo que se pueda decidir con facilidad. Entra Roger Fisher.

Fisher fue un profesor de Leyes de Harvard quien en los 80s sirvió de asesor para el Pentágono en asuntos internacionales. Fisher propuso otra manera para manejar el accesso y la facilidad con que cualquier presidente pueda usar los códigos nucleares. Él propuso que en vez de que los código nucleares estén guardados en un maletín, estos sean implantados en el corazón del asistente que siempre anda con el presidente. El asistente siempre cargará con un cuchillo. En caso que sea necesario un ataque nuclear, el presidente tendrá que utilizar el cuchillo y él mismo extraer los códigos nucleares del corazón del asistente, quitándole la vida. El razonamiento detrás de esto es que si el presidente quisiera utilizar bombas nucleares y matar a miles, él debe matar a un humano también. (por si se preguntan, sí, ya hay personas que estan dispuestas a servir como ese asistente) ¿Qué piensan? #historia  
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I haven't seen a good game trailer in a long time
 
Real voices. Real players. New #eveonline  game trailer. #thisiseve  
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Beautiful modern stone facade. What do you think? 
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More modern architecture projects on: http://www.architecturebeast.com/

#archibeast  
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Jorge's Collections
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Introduction
I'm a Beta version of a perfect man. Some errors might occur.
Bragging rights
Once upon a time I died of Alzheimer, but I forgot I died. So here I am. // Hubo una vez en la que morí de Alzheimer, pero olvidé que había muerto. Así que heme aquí.
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Washington, DC
Previously
Arlington, VA - Washington, DC - Puerto Rico - Yabucoa, Puerto Rico - San Juan, Puerto Rico
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Education
  • George Washington University
    Masters of Science in Information Systems Technology, 2003 - 2007
  • Universidad de Puerto Rico
    Bachelors of Business Administration in Computer Information Sytems, 1997 - 2003
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Male
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Jorge Sepúlveda's +1's are the things they like, agree with, or want to recommend.
Phandroid
plus.google.com

The World's First and Largest Android-Dedicated News Source.

Using AngularJS to Load Some Photos from Flickr
festintecnologico.blogspot.com

For the following example we are going to review an easy example of AngularJS to consume a Json String from Flickr. We can summarise the pro

How to apply a formula to entire column except first row? - Google Produ...
productforums.google.com

How to apply a formula to entire column except first row? kalehv, 12/25/13 9:11 AM. Hi all,. I want my entire column to have a same formula

Maps
market.android.com

The Google Maps app for Android phones and tablets makes navigating your world faster and easier. Find the best spots in town and the inform

Chromecast
market.android.com

Chromecast is the easiest way to enjoy online video and anything from the web on your TV. Plug it into any HDTV and control it with your exi

Blek
market.android.com

Blek can't be described with words, watch the video.----- Recognition & Commentaries -----"Perfect representation of touch-screen play" ~ Th

Feedly: Blogs, RSS News Reader
market.android.com

All your favorite websites in one place.Instead of having to hunt down for news, feedly aggregates the contents of your favorite sites and d

19 Questions with Diego | Love & Vegetables
www.loveandveggies.com

1. What’s your name? “Diego Luis Feliciano Lopez” 2. Where are you from, Diego? “San Juan, Puerto Rico - born and raised.” 3. So you ate a l

Chozen
market.android.com

Chozen is an animated comedy about a gay white rapper on a quest for redemption. Shaped by his time in prison, Chozen's music takes aim at p

Google Camera
market.android.com

Google Camera snaps quick and easy photos and videos, and has creative picture modes like Photo Sphere, Lens Blur and Panorama.Features • Ph

Google Wallet
market.android.com

Shop, save, and pay with your phone. • Carry your loyalty programs and offers in one place • Send money easily to any friend in the US with

SOBE Organic Cleaning
sobeorganic.com

"Great customer service goes a long way…not to mention the feeling of coming home to an incredibly clean home after a hard day at work. Than

SOBE Organic Cleaning
www.sobeorganic.com

"Great customer service goes a long way…not to mention the feeling of coming home to an incredibly clean home after a hard day at work. Than

SOBE Organic Cleaning
yabuco.com

"Great customer service goes a long way…not to mention the feeling of coming home to an incredibly clean home after a hard day at work. Than

Google Drive
market.android.com

* Con Google Drive, puoi archiviare tutti i tuoi file in un unico posto, per potervi accedere ovunque e condividerli con altri * Usa l'appli

Hangouts (Talk'un yerine)
market.android.com

Hangouts, bire bir ve grup olarak yapılan görüşmelere fotoğraflar, emoji ve video görüşmeleri ile ücretsiz olarak hayat verir. Bilgisayarlar

Juice Cubes
market.android.com

FREE NEW PUZZLE GAME!The creators of Angry Birds present a delicious NEW puzzle game with tons of fresh and fruity challenges! Connect the c

Atlas (From “The Hunger Games: Catching Fire” Soundtrack)
market.android.com

Fai acquisti da Google Play sul Web. Acquista e divertiti immediatamente sul tuo cellulare o tablet Android senza il problema della sincroni

Views - Google Maps
www.google.com

Google - About Google - Privacy & Terms.

Great service. They picked me up at the car shop and brought me back. I liked that.
Public - 3 months ago
reviewed 3 months ago
Great customer service. Came for emission inspection. They quickly serviced my car.
Public - a year ago
reviewed a year ago
31 reviews
Map
Map
Map
From the person who received me at the emergency entrance, to the nurses, and the doctors, their service, attention, and care was perfect! I was very impressed. This hospital is a model of how patient-care should be done. Thank you for taking care of me.
Public - 3 months ago
reviewed 3 months ago
Dr. Ambardar is great! She is very helpful, respectful and with excellent bedside manners. She was able to answer all my questions and took care of me.
Public - 7 months ago
reviewed 7 months ago
Great staff. Ines is my favorite, but they're all good.
Public - a year ago
reviewed a year ago