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Don't look up. Spacetime is a medium, like the idea of the Aether. Therefore the speed of light c is not a constant, c = 1/sqrt(𝜖0𝜇0). We can change the permittivity 𝜖 by hitting the Schwinger limit E = m^2 * c^3/eℏ ≈ 1.32×10^18 V/m. A big number, but... show more

Ashton Forbes

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71,112 Aufrufe • vor 7 Monaten •via X (Twitter)

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The secret to warp drive and wormholes is unlabored acceleration. You condition the vacuum by modifying epsilon and mu, the permittivity and permeability of spacetime. That way you don't need a huge amount of energy for a wormhole.

The secret to warp drive and wormholes is unlabored acceleration. You condition the vacuum by modifying epsilon and mu, the permittivity and permeability of spacetime. That way you don't need a huge amount of energy for a wormhole.

Ashton Forbes

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#WATCH | Ghaziabad, UP: During the launch of his book 'Decoding Success', Author and founder of the PrashantAdvait Foundation, Acharya Prashant, says "To save the earth, the United Nations COP had very clearly laid down the condition with scientific data that we have to reduce our carbon emissions so much that the global temperature should not increase by more than 1.5 degrees C even by 2030. 2025 has arrived, and we have crossed the 1.5 degrees C threshold, and this is an indication of a very big destruction to come. This 'Operation 2030' has been discussed for that, because we had set a limit for ourselves that we should not let it happen even till 2030 but we have crossed the temperature limit in 2025 itself...1.5 degrees C is not a random number. The increase in temperature by 1.5 degrees C is a very dangerous figure. Because when the average temperature of the Earth increases by more than 1.5 degrees C above normal, then very dangerous feedback cycles get activated. Feedback cycle means that even if you do not emit any more extra carbon dioxide, such cycles get started which will keep increasing carbon dioxide in the atmosphere on their own and now humans cannot stop those cycles..."

#WATCH | Ghaziabad, UP: During the launch of his book 'Decoding Success', Author and founder of the PrashantAdvait Foundation, Acharya Prashant, says "To save the earth, the United Nations COP had very clearly laid down the condition with scientific data that we have to reduce our carbon emissions so much that the global temperature should not increase by more than 1.5 degrees C even by 2030. 2025 has arrived, and we have crossed the 1.5 degrees C threshold, and this is an indication of a very big destruction to come. This 'Operation 2030' has been discussed for that, because we had set a limit for ourselves that we should not let it happen even till 2030 but we have crossed the temperature limit in 2025 itself...1.5 degrees C is not a random number. The increase in temperature by 1.5 degrees C is a very dangerous figure. Because when the average temperature of the Earth increases by more than 1.5 degrees C above normal, then very dangerous feedback cycles get activated. Feedback cycle means that even if you do not emit any more extra carbon dioxide, such cycles get started which will keep increasing carbon dioxide in the atmosphere on their own and now humans cannot stop those cycles..."

ANI

31,281 Aufrufe • vor 1 Jahr

A Black Hole Can Be Dragged Through Spacetime A Black Hole does not have to sit still. Einstein’s equations allow a stranger possibility... a Black Hole that accelerates. This is the C-metric, an exact solution of General Relativity describing an accelerating Black Hole. The Black Hole accelerates because the geometry of Spacetime says it must. The C-metric is one of those exact solutions that reminds us how wild General Relativity really is. Gravity is not just attraction, and Spacetime is not just a stage. Sometimes the stage itself contains the force. #Astrophysics #GeneralRelativity #Einstein #CMetric #BlackHole #CosmicStrings #Spacetime #Cosmology #Mathematics #Physics

A Black Hole Can Be Dragged Through Spacetime A Black Hole does not have to sit still. Einstein’s equations allow a stranger possibility... a Black Hole that accelerates. This is the C-metric, an exact solution of General Relativity describing an accelerating Black Hole. The Black Hole accelerates because the geometry of Spacetime says it must. The C-metric is one of those exact solutions that reminds us how wild General Relativity really is. Gravity is not just attraction, and Spacetime is not just a stage. Sometimes the stage itself contains the force. #Astrophysics #GeneralRelativity #Einstein #CMetric #BlackHole #CosmicStrings #Spacetime #Cosmology #Mathematics #Physics

Mathelirium

788,397 Aufrufe • vor 24 Tagen

The Elusive Concept of Time. Your instincts treat time like a background meter the whole universe shares. Relativity does not take time away, it forces you to earn it operationally. Events are points. Motion is a curve through them. A clock is not a metaphor, it is a worldline with a number attached to it. Two observers can disagree on which distant events are simultaneous, and nothing contradictory happens, because causal structure is still pinned down by light cones and invariants. Even in weak gravity the rule shows up. A clock deeper in a gravitational potential ticks more slowly relative to one far away. Near a compact object the difference becomes hard to ignore. Add rotation and spacetime itself picks up a twist. That twist is frame dragging, not a new force, just geometry telling you that time and angle are coupled in a rotating spacetime. In the animation You are watching a geometry lesson disguised as a black hole scene. The fabric is a visualization of the field shaping clock-rates and the paths light can take. The ripples are driven by local proper time, so their phase visibly slows as you approach the horizon. The accretion disk is lensed through Kerr ray tracing, and its brightness is pushed by redshift and beaming so the approaching side can flare while the receding side dims. Beacon points at different radii pulse at different rates, so you can see time dilation without any labels. The bead ring is a redshift tracer, with intensity scaled by a g³ proxy so deeper emission arrives weaker and shifted. The math breakdown Start with what a clock actually measures. Proper time τ is the accumulated time along an observer’s worldline. In special relativity, the invariant interval is ds² = c² dt² − dx² − dy² − dz² Along a timelike path, dτ = (1/c) √(ds²) = √( dt² − (1/c²)(dx²+dy²+dz²) ) If the observer moves with speed v, so dx²+dy²+dy²+dz² = v² dt², then dτ = dt √(1 − v²/c²) That is time dilation as geometry. The moving clock accumulates less τ between the same pair of events. Now add gravity. General relativity replaces the flat interval with a metric gᵤᵥ that depends on position: ds² = gᵤᵥ dxᵘ dxᵛ For a stationary clock in Schwarzschild geometry (mass M), the time component is g_tt = −(1 − 2GM/(rc²)) If the clock sits at fixed r (no spatial motion), ds² = g_tt c² dt², so dτ = dt √(1 − 2GM/(rc²)) Closer to the mass means a smaller factor, so the clock ticks more slowly relative to a clock far away. That is the rule used to drive the fabric phase in the animation. Now connect time to light. A gravitational field shifts photon frequency. Between an emitter at rₑ and an observer at rₒ, f_obs / f_emit = √( (1 − 2GM/(rₑ c²)) / (1 − 2GM/(rₒ c²)) ) For a far-away observer rₒ → ∞, f_obs / f_emit = √(1 − 2GM/(rₑ c²)) Deeper emission arrives redshifted. Lower frequency. Lower energy per photon. In the render, the disk intensity uses a Kerr-derived redshift factor g (clipped for stability). The bead ring uses a simple radiative proxy I_obs ∝ g³ I_emit to make that effect visible. Finally, why rotation looks like a twist. A rotating black hole is Kerr geometry. The key structural change is a nonzero g_tφ term, which couples time to angle. That coupling is frame dragging in equations. Near the hole, being stationary is not the same notion everywhere, because the local inertial frames are being pulled around the spin axis. So the moral stays clean. Time is not a universal substance flowing everywhere at one rate. It is what clocks accumulate along worldlines. Light cones constrain what can influence what. Invariants are what everyone agrees on. The rest is operational detail that only feels universal because our daily corner of the universe is slow and mild. #GeneralRelativity #Gravity #FrameDragging #BlackHoles #Spacetime

The Elusive Concept of Time. Your instincts treat time like a background meter the whole universe shares. Relativity does not take time away, it forces you to earn it operationally. Events are points. Motion is a curve through them. A clock is not a metaphor, it is a worldline with a number attached to it. Two observers can disagree on which distant events are simultaneous, and nothing contradictory happens, because causal structure is still pinned down by light cones and invariants. Even in weak gravity the rule shows up. A clock deeper in a gravitational potential ticks more slowly relative to one far away. Near a compact object the difference becomes hard to ignore. Add rotation and spacetime itself picks up a twist. That twist is frame dragging, not a new force, just geometry telling you that time and angle are coupled in a rotating spacetime. In the animation You are watching a geometry lesson disguised as a black hole scene. The fabric is a visualization of the field shaping clock-rates and the paths light can take. The ripples are driven by local proper time, so their phase visibly slows as you approach the horizon. The accretion disk is lensed through Kerr ray tracing, and its brightness is pushed by redshift and beaming so the approaching side can flare while the receding side dims. Beacon points at different radii pulse at different rates, so you can see time dilation without any labels. The bead ring is a redshift tracer, with intensity scaled by a g³ proxy so deeper emission arrives weaker and shifted. The math breakdown Start with what a clock actually measures. Proper time τ is the accumulated time along an observer’s worldline. In special relativity, the invariant interval is ds² = c² dt² − dx² − dy² − dz² Along a timelike path, dτ = (1/c) √(ds²) = √( dt² − (1/c²)(dx²+dy²+dz²) ) If the observer moves with speed v, so dx²+dy²+dy²+dz² = v² dt², then dτ = dt √(1 − v²/c²) That is time dilation as geometry. The moving clock accumulates less τ between the same pair of events. Now add gravity. General relativity replaces the flat interval with a metric gᵤᵥ that depends on position: ds² = gᵤᵥ dxᵘ dxᵛ For a stationary clock in Schwarzschild geometry (mass M), the time component is g_tt = −(1 − 2GM/(rc²)) If the clock sits at fixed r (no spatial motion), ds² = g_tt c² dt², so dτ = dt √(1 − 2GM/(rc²)) Closer to the mass means a smaller factor, so the clock ticks more slowly relative to a clock far away. That is the rule used to drive the fabric phase in the animation. Now connect time to light. A gravitational field shifts photon frequency. Between an emitter at rₑ and an observer at rₒ, f_obs / f_emit = √( (1 − 2GM/(rₑ c²)) / (1 − 2GM/(rₒ c²)) ) For a far-away observer rₒ → ∞, f_obs / f_emit = √(1 − 2GM/(rₑ c²)) Deeper emission arrives redshifted. Lower frequency. Lower energy per photon. In the render, the disk intensity uses a Kerr-derived redshift factor g (clipped for stability). The bead ring uses a simple radiative proxy I_obs ∝ g³ I_emit to make that effect visible. Finally, why rotation looks like a twist. A rotating black hole is Kerr geometry. The key structural change is a nonzero g_tφ term, which couples time to angle. That coupling is frame dragging in equations. Near the hole, being stationary is not the same notion everywhere, because the local inertial frames are being pulled around the spin axis. So the moral stays clean. Time is not a universal substance flowing everywhere at one rate. It is what clocks accumulate along worldlines. Light cones constrain what can influence what. Invariants are what everyone agrees on. The rest is operational detail that only feels universal because our daily corner of the universe is slow and mild. #GeneralRelativity #Gravity #FrameDragging #BlackHoles #Spacetime

Mathelirium

149,517 Aufrufe • vor 5 Monaten

In a recent video, I showed that in a 3-4-5 right triangle, the radius of the inscribed circle is 1. We can generalize this: in an a-b-c right triangle, the radius of the inscribed circle is (a+b-c)/2. Here's how we know this:

In a recent video, I showed that in a 3-4-5 right triangle, the radius of the inscribed circle is 1. We can generalize this: in an a-b-c right triangle, the radius of the inscribed circle is (a+b-c)/2. Here's how we know this:

Howie Hua

48,216 Aufrufe • vor 6 Monaten

What Happens When a Black Hole Does More Than Fall? In General Relativity, a rotating Black Hole is described by the Kerr Metric. Its spin does something strange to spacetime... it drags the geometry around with it. The horizon sits at r₊ = M + √(M² - a²) but outside it there is another surface, the Ergosphere, r_E(θ) = M + √(M² - a²cos²θ) Inside that region, Spacetime is being swept around so strongly that remaining still is no longer possible. Every particle, every light thread, every local observer is forced to rotate with the geometry. For this scene, the C-metric acceleration remains alive in the background and the Black Hole still moves through the fabric, pulled along an axial defect. But the main event is Kerr frame dragging. The fabric twists. The Ergosphere breathes. Light paths shear into spirals. Particles that try to cross the region get carried around before falling inward. #GeneralRelativity #BlackHole #KerrMetric #FrameDragging #Ergosphere #Spacetime #EinsteinEquations #Astrophysics #Physics

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Mathelirium

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Joginder Tuteja

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Black men make up less than 2% of teachers in the U.S. The Literacy Lab is working to change that. Having a teacher of the same race is important for students of color! We need more exemplary Black men in the classroom!

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Ben Crump

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Tranpa, less is more. You look like a burnt spud at the back of the oven.

Tranpa, less is more. You look like a burnt spud at the back of the oven.

Jack David

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Tim Farmer

115,640 Aufrufe • vor 1 Jahr

The ratio of a circle's circumference (C) to its diameter (d) is constant, regardless of the circle's size. This ratio is the usual definition for the number π. Do you know other ways to define this mathematical constant? #mathweek #πday #maths #MathType

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MathType

61,813 Aufrufe • vor 3 Jahren

In stablecoins, one small letter can mean a world of difference. Look for the C. Find the right stablecoin for you.

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USDC

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In stablecoins, one small letter can mean a world of difference. Look for the C. Find the right stablecoin for you.

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USDC

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Nick Norwitz MD PhD

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One of the most beautiful aviation creations by Japan — the Kawasaki C-2. A modern tactical airlifter built for speed, efficiency & heavy transport missions. And the only replacement of C-17 Globemaster in the upcoming times. 🎥- ecom_photo

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The solution is the more you look, the less you see. The truth will always stand out. Governance is not "amansi", it is a due diligent service for the people.

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Anambra 1st son

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Dan Dicks

47,180 Aufrufe • vor 9 Monaten

The hospital makes 2 to 2.5x more money from a C-section than a vaginal birth. And if the baby ends up in the NICU, it's even more revenue. NICU admissions have nearly doubled in the last 15 to 20 years, from just over 5% to almost 10% of all births, according to the CDC. It's worth asking how we got here. Part of the answer is expediency. A scheduled C-section at 7:30am is done by 8:20. That kind of predictability is easier to build a hospital system around than individualized care for each woman's labor. The other part is reimbursement. If we wanted to lower the C-section rate, we could change how we pay for births. If insurance paid more for vaginal deliveries than cesareans, you'd be watching the incentives shift. The doctor may not pocket the difference, but the hospital does, and the doctor saves time either way. Pregnancy is the only reason you go to a hospital for something that is a completely normal physiologic function. That context matters when we talk about how birth decisions actually get made. Dr. Stu Fischbein and Del discuss 👇

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The HighWire

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