Jan 21
Something’s gotta get me through the work day
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Something’s gotta get me through the work day
Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
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Is the universe really infinite? Or could it close back on itself like a sphere? If it’s infinite, how can it expand? And is it true that there might be copies of you in it? These are all questions which were discussed in a recent video from Kurzgesagt, and some random string of letters on X-twitter asked me if I could fill in the academic background. And how could I not oblige if someone asks me to release my inner nerd. So here we go. The first question “Is the universe really infinite” is easy to answer: we don’t know. We can’t know because since the big bang there has only been so much time for light to travel. So we only see part of the universe. And beyond that part which we see, the universe might go on forever or not. In our mathematics, we use a universe that’s infinite in size. But we just do this because it’s simple and it might not be physically correct. To see why, I need to tell you a little about how we use Einstein’s theory of general relativity.
This theory says that space and time form a common entity called space-time and that this space-time can curve. You often see this illustrated with you know a rubber sheet with a ball in it and marbles and stuff. This suggests that curvature is something that you infer from looking at space-tie from the outside. You see that the sheet is bent. But this isn’t what we mean by a curved space or curved space-time in general relativity.
The curvature of space-time is something that is measured internally in the space, and it’s also the reason why I am sitting on this desk because the simplest possible example is a flat sheet of paper. Exciting, I know, but bear with me. How do we know the paper is flat? Easy enough, you draw a triangle on it, and then you measure all the interior angles and add them up. If they add to 180 degrees, no matter which triangle you draw and no matter which size, the space is flat. Homework assignment: draw all possible triangles on a sheet of paper and prove that it’s flat. The thing is though, that the angles of triangles don’t always add up that way. Take for example a sphere. In an extreme case you can draw a triangle by following the equator, turn 90 degrees, go to to the north pole, turn 90 degrees, go back to the equator, and turn 90 degrees back onto the equator. Now you have a triangle with three 90 degree angles, that 270 degrees in total! This tells you that a sphere isn’t flat.
I washed this moon because there were already drawings on it, and now it’s got water inside and I’m afraid it will rust. Yes, you already knew that a sphere isn’t flat, but the point is that you don’t need to be able to look at the sphere from the outside. You can infer its curvature entirely from measurements on the sphere. When it comes to the curvature of space and time it’s the same thing. We say they are curved because of properties that we measure entirely on the inside. The things we measure are observables such as the redshift or light, or the travel time, or the paths on which bodies move and so on. You could ask now, well, if those are all things we measure on the inside, what sense does it even make to call this curvature. Couldn’t we just say that spacetime is flat, just that these observables have difficult relations that are mediated by some sort of field. Indeed, this is a valid interpretation of the maths, that you refuse to give this a geometric interpretation and instead just say gravity is determined by some sort of complicated field. This is why Steven Weinberg in his book on general relativity famously refused to use a geometric interpretation. You don’t need it. And if you don’t need the geometric interpretation, why subscribe to it. Unlike this channel, where subscribing is scientifically proven to make maths 10 percent less intimidating. That’s exactly those 10% you’ll forget while I make silly jokes.
LISTEN TUMBLR!! Don’t go changing the format on me now! First you make a live button and put it where the search engine used to be and now my profile?!?!?! I’m at not interested in buying things or people seeing my face here. That’s why i came here in the first place. So i can release my inner nerd without the world knowing who I am.
Rant over…
Maybe…
Stop changing!!!
My Inner Nerd
No matter how hard I try, she breaks through.
There is no cool part of me left.
I don't know if I ever even had a cool part
To begin with.
MEGA MAN 'wearable' Replica Helmet UNBOXING
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After much suppression I’m unleashing my Inner nerd!!
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Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
Free to watch • No registration required • HD streaming
Shopping
Shopping is a fun experience.. when you have money. Sometimes, I do actually HAVE money but I’m saving for something (which is a royal pain in the ass). BUT! I still buy stuff.
Like today a bought a cute little Gudetama key-chain for my bag. It fits perfectly with all my other chains and buttons. I hope to one day have my bag completely covered so my inner nerd shows XD.
I also stopped by Chick-Fil-A and got a lemonade and a chicken sandwhich. I had no idea their lemonade had so much pulp in it! I had to wait til I got home so I could strain it out! But hey, at least it’s good.
That’s all for my day mostly. Until tomorrow, bye!
Ever wonder what a fan music video would look like? I mean what if fans were in charge of the MV concept? When ever I’m working I have either my kmusic playlist on or I’m listening to my jaypark radio on iTunes but no matter what I always close my eyes and imagine what kind of MV i would make. I can see it play out in my head and man I wish I could make one lol. Like give me a sky drone, a water drone, some self stabilizing cameras like that cool looking eye one and a couple of sexy Asian guys and some cute girls. I would make the best MV lol. It it reminds me of a game of thrones quote “Give me 10 good men and some climbing spikes... I'll impregnate the bitch.” 😂😂 sorry my inner nerd is showing.
[Laptop shopping was a success :D Also got an idea for when this laptop finally decides to die >.>]