#generalrelativity — Public Fediverse posts

Darkness Can Move Faster Than Light Without Breaking the Laws of Physics

Artistic depiction of the darkness measurement. Image not to scale. Physicists have experimentally confirmed a strange prediction: the…
#NewsBeep #News #Physics #CA #Canada #darkness #generalrelativity #relativity #Science #speedoflight
https://www.newsbeep.com/ca/649634/

Darkness Can Move Faster Than Light Without Breaking the Laws of Physics

Artistic depiction of the darkness measurement. Image not to scale. Physicists have experimentally confirmed a strange prediction: the…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Physics #darkness #GeneralRelativity #Relativity #Science #speedoflight
https://www.newsbeep.com/us/625064/

Darkness Can Move Faster Than Light Without Breaking the Laws of Physics

Artistic depiction of the darkness measurement. Image not to scale. Physicists have experimentally confirmed a strange prediction: the…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Physics #darkness #GeneralRelativity #Relativity #Science #speedoflight
https://www.newsbeep.com/us/625064/

https://www.europesays.com/ie/469668/ Darkness Can Move Faster Than Light Without Breaking the Laws of Physics #DARKNESS #Éire #GeneralRelativity #IE #Ireland #Physics #relativity #Science #SpeedOfLight

https://www.europesays.com/uk/939311/ Darkness Can Move Faster Than Light Without Breaking the Laws of Physics #darkness #GeneralRelativity #Physics #Relativity #Science #SpeedOfLight #UK #UnitedKingdom

My #paperOfTheDay was "Galilei invariance, action-reaction principle, and center of mass theorem" from 1983.
This is an article about #generalRelativity , without anything quantum. From daily experience, we know that every object has a mass, but thinking more closely, the parameter we call mass actually appears in different ways in #physics, and it is not a priory clear how they are logically related. Einstein's famous thought experiment was about the "falling elevator", that is, if you are in a box and can't look outside, you can not distinguish whether you fall freely, or you are located far away from a planet where there is no gravitational field. This "weak equivalence principle" asserts the equivalence between "inertial mass", the parameter which determines how hard it is to accelerate something, and "passive gravitational mass", the parameter that determines how strongly a gravitational field acts on an object.
But there is a third type of mass, the "active gravitational mass", which determines how much gravitational field is generated by an object. The "strong equivalence principle" asserts that all three masses are the same.
The present article demonstrates that, as far as classical celestial mechanics is concerned, the strong equivalence principle can not been distinguished from the weak one. That is, the observed motion of celestial bodies can already be explained by the weak equivalence principle, regardless of whether the strong one holds or not.
I don't know what the current state of affairs is in that question, in particular regarding quantum theory.
https://link.springer.com/article/10.1007/BF01889417

1/n Notes on #UAP Discussions : This particular exploration is a milestone. If we map what they eventually wind up talking about to vexing questions in current #Physics we have a direct confrontation with #GeneralRelativity, #QuantumMechanics, and the applied mass- energy firewall problem that lies at at the heart of several open problems in #Cosmology and the SM. It should be noted that the intuition of #Engineers in this case is capable of beating #Physicists to the punch.
There is a bit…

`The Lense-Thirring effect, a prediction of general relativity, implies that massive rotating objects like Earth can slightly "drag" spacetime, which could affect the pendulum's oscillation. This effect, though theoretically significant, is currently too small to measure with a Foucault pendulum.`

https://en.wikipedia.org/wiki/Foucault_pendulum#Absolute_reference_frame_for_pendulum

#physics #Foucault #pendulum #FoucaultPendulum #Earth #rotation #relativity #generalRelativity #Einstein

`The Lense-Thirring effect, a prediction of general relativity, implies that massive rotating objects like Earth can slightly "drag" spacetime, which could affect the pendulum's oscillation. This effect, though theoretically significant, is currently too small to measure with a Foucault pendulum.`

https://en.wikipedia.org/wiki/Foucault_pendulum#Absolute_reference_frame_for_pendulum

#physics #Foucault #pendulum #FoucaultPendulum #Earth #rotation #relativity #generalRelativity #Einstein

`The Lense-Thirring effect, a prediction of general relativity, implies that massive rotating objects like Earth can slightly "drag" spacetime, which could affect the pendulum's oscillation. This effect, though theoretically significant, is currently too small to measure with a Foucault pendulum.`

https://en.wikipedia.org/wiki/Foucault_pendulum#Absolute_reference_frame_for_pendulum

#physics #Foucault #pendulum #FoucaultPendulum #Earth #rotation #relativity #generalRelativity #Einstein

`The Lense-Thirring effect, a prediction of general relativity, implies that massive rotating objects like Earth can slightly "drag" spacetime, which could affect the pendulum's oscillation. This effect, though theoretically significant, is currently too small to measure with a Foucault pendulum.`

https://en.wikipedia.org/wiki/Foucault_pendulum#Absolute_reference_frame_for_pendulum

#physics #Foucault #pendulum #FoucaultPendulum #Earth #rotation #relativity #generalRelativity #Einstein

`The Lense-Thirring effect, a prediction of general relativity, implies that massive rotating objects like Earth can slightly "drag" spacetime, which could affect the pendulum's oscillation. This effect, though theoretically significant, is currently too small to measure with a Foucault pendulum.`

https://en.wikipedia.org/wiki/Foucault_pendulum#Absolute_reference_frame_for_pendulum

#physics #Foucault #pendulum #FoucaultPendulum #Earth #rotation #relativity #generalRelativity #Einstein

Another of my videos just hit 1.1k views

https://youtube.com/shorts/HlCvdxvgDwg

📹<^-^7🎨

#art #artist #illustrator #illustrated #quantummechanics #generalrelativity

I guess I'm #writing again, because yesterday I brainstormed a bunch of ideas for #book three, (Moon,) and then I woke up at 2:30 AM, realizing (I think) that I had messed up the #generalrelativity between #books one (Atmosphere,) and two, (Ocean.) This, after I spent a whole lot of time trying to make it work during the writing #process. I have a tenuous grasp on the #theory. Wish I had a #physicist friend I could #brainstorm with. #physics #question

I've come up with an equation that describes the early universe and how it was created. I've described and shown how symmetry breaking occurs due to black hole structure

I'm currently being considered for Mensa here in Australia because of my Quantum Mechanical Diagrams

<O,O>

#art #artist #illustrator #illustrated #quantummechanics #generalrelativity

I'm being considered for Mensa because of my Quantum Mechanical Diagrams

<O,O>

#art #artist #illustrator #illustrated #quantummechanics #generalrelativity

What if time moved slower… just because of where you are?

Earth vs. near Sagittarius A*, the supermassive black hole.

This is real. This is relativity.

Try it yourself: https://stellarsnap.space

#TimeDilation #GeneralRelativity #BlackHole #Astronomy #StellarSnap

Ever wondered how time slows near a black hole?
Compare how time flows near stars, planets & black holes interactively.
Try it now: https://stellarsnap.space/time-dilation

#TimeDilation #Relativity #BlackHoles #Physics #Astronomy #Science #Astrophysics #Einstein #SpaceTime #GeneralRelativity #SpecialRelativity #Cosmos #SpacetimeCurvature #Gravity #SpaceTools #StellarSnap

Unifying general relativity and the electromagnetic force? (I presume this also includes the weak nuclear force at sufficiently high energies, but this summary doesn't say)

https://phys.org/news/2025-04-einstein-field-theory.html

I'm pretty much at the limit of my understanding of field theories and such just in this summary article, I don't think I'll even try their full journal article.

@cenobyte - Does Professor Skye or her research assistant have any comment on the matter?

#relativity #GeneralRelativity #electromagnetic #force #field #TOE #GUT

https://phys.org/news/2025-03-gravity-entropy-radical-approach-quantum.html

…quantifies the difference between the metric of #spacetime and the metric induced by #matter fields.

…modified Einstein equations that, in the low coupling regime, i.e., low energies and small curvature, reduce to the classical equations of #generalrelativity…predicting the emergence of a small, positive cosmological constant—a value that aligns with experimental observations of the universe's accelerated expansion…

#quantumgravity #quantuminformation

Dear geodesists, astronomers, and astrophysicists: Does any of you know of some publication that explicitly reports the expression for the metric in a Geocentric Terrestrial Reference System (GTRS) or in the more specific International Terrestrial Reference System (ITRS)?

Various publications (eg https://doi.org/10.1086/378162) and textbooks (eg https://doi.org/10.1017/CBO9781139507486) report and discuss the metrics for the Geocentric Celestial Reference System (GCRS), but not for the GTRS. (Even though it seems to me that the expression should be formally identical, as the off-diagonal timelike components take care of rotation).

Cheers! (Sorry for spamming borderline hashtags.)

#iau #geodesy #astronomy #physics #generalrelativity #astrophysics #internationalastronomicalunion

Not the "theory of everything"?
#physics #quantummechanics #generalrelativity #theoryofeverything #scientificresearch
🤓

https://www.popularmechanics.com/science/a62505507/incorrect-unified-theory/

Physics lecture video link https://youtu.be/WvQsDSJhMiw

#generalrelativity #relativity #spacetime #matter #universe #space #tensor #time #curve #gravitational #gravity #curve #einstein #gtr

#NimaArkaniHamed - What's #Fundamental in the #Cosmos?

https://www.youtube.com/watch?v=cJvk_YXYuDw

#Philosophy
PhilosophyOfCosmology #Cosmology #PhilosophyOfScience #Science #Physics #Astronomy #Astrophysics #QM #QuantumMechanics #QuantumPhysics #GR #GeneralRelativity #Naturalness #FineTuning #LHC #SuperSymmetry #LargeHardonCollider #AnthropicPrinciple #Multiverse #CloserToTruth #RobertKuhn

#RaphaelBousso - #Events and the Nature of #Time

https://www.youtube.com/watch?v=z4lsok7h0G8

#Philosophy #PhilosophyOfCosmology #Cosmology #PhilosophyOfTime #QM #QuantumMechanics #QuantumTheory #QuantumPhysics #Physics #GR #GeneralRelativity #Gravity #QuantumCosmology #QuantumGravity #Entropy #2ndLaw #SecondLaw #Thermodynamics #CloserToTruth #RobertKuhn

#RaphaelBousso - #Events and the Nature of #Time

https://www.youtube.com/watch?v=z4lsok7h0G8

#Philosophy #PhilosophyOfCosmology #Cosmology #PhilosophyOfTime #QM #QuantumMechanics #QuantumTheory #QuantumPhysics #Physics #GR #GeneralRelativity #Gravity #QuantumCosmology #QuantumGravity #Entropy #2ndLaw #SecondLaw #Thermodynamics #CloserToTruth #RobertKuhn

#RaphaelBousso - #Events and the Nature of #Time

https://www.youtube.com/watch?v=z4lsok7h0G8

#Philosophy #PhilosophyOfCosmology #Cosmology #PhilosophyOfTime #QM #QuantumMechanics #QuantumTheory #QuantumPhysics #Physics #GR #GeneralRelativity #Gravity #QuantumCosmology #QuantumGravity #Entropy #2ndLaw #SecondLaw #Thermodynamics #CloserToTruth #RobertKuhn

#RaphaelBousso - #Events and the Nature of #Time

https://www.youtube.com/watch?v=z4lsok7h0G8

#Philosophy #PhilosophyOfCosmology #Cosmology #PhilosophyOfTime #QM #QuantumMechanics #QuantumTheory #QuantumPhysics #Physics #GR #GeneralRelativity #Gravity #QuantumCosmology #QuantumGravity #Entropy #2ndLaw #SecondLaw #Thermodynamics #CloserToTruth #RobertKuhn

#RaphaelBousso - #Events and the Nature of #Time

https://www.youtube.com/watch?v=z4lsok7h0G8

#Philosophy #PhilosophyOfCosmology #Cosmology #PhilosophyOfTime #QM #QuantumMechanics #QuantumTheory #QuantumPhysics #Physics #GR #GeneralRelativity #Gravity #QuantumCosmology #QuantumGravity #Entropy #2ndLaw #SecondLaw #Thermodynamics #CloserToTruth #RobertKuhn

(4/4)

I just really hate how physicist write the cov derivative of the *components* of a tensor (or a section of any vector bundle), while it only make sense if you consider the derivative of the tensor itself.

#DifferentialGeometry #Gravity #GeneralRelativity #Mathematics #Physics

(2/4)
… And for a normal (i.e. \( \mathbb R \)-valued) diff form the cov ext diff \( d_\nabla \) shall be just the same as the normal ext diff \( d \).
This confuses me for a long time.
Until I realised: the eq I wrote above was taken from a #GR textbook, and physicists tend to write every things into coordinates/components/infices format, which brings the confusion.

#DifferentialGeometry #Gravity #GeneralRelativity #Mathematics #Physics

(3/4)
In fact, the tetrad shall be considered as a vector valued 1-form:
\[
theta = \theta_j^i \partial_i \otimes d x^j,
\]
therefore there is no meaning for the cov ext diff for a component of a vector!
One should really consider is the \( d_\nabla \theta\), where the connection is considered on the tangent bundle of the spacetime manifold.

#DifferentialGeometry #Gravity #GeneralRelativity #Mathematics #Physics

(1/4)
I was trying to reason about the (1st) Cartan structure equation
\[ d_\nabla \theta^i = d \theta^i + \Gamma^i_j \wedge \theta^j = 0,\]
where \( d_\nabla \) is the covariant exterial differential, \(\nabla\) is the Levi-Civita connection with connection form \( \Gamma \), and \( \theta \) is an (orthogonal) tetrad.
For me this does not make sense, since \( \theta^i \) is just a normal 1-form, and…

#DifferentialGeometry #Gravity #GeneralRelativity #Mathematics #Physics

#FreemanDyson - What's #Fundamental in the #Cosmos?

https://www.youtube.com/watch?v=JkNTXzsYurA

#Philosophy #PhilosophyOfScience #Science #Physics #Fundamentalism #Physicalism #Materialism #Math #Maths #Mathematics #Matrices #FFT #FastFourierTransform #RandomMatrices #QM #QuantumMechanics #QED #QuantumElectrodynamics #Gravity #QuantumGravity #GR #GeneralRelativity #CloserToTruth #RobertKuhn

#DeanRickles - Is #Time #Fundamental?

https://www.youtube.com/watch?v=1TkPn-QNYtk

#Philosophy #PhilosophyOfTime #Logic #Metaphysics #PhilosophyOfScience #Science #Emergence #Physics #Entropy #StatisticalMechanics #GR #GeneralRelativity #SpecialRelativity #Newton #Einstein #QM #QuantumMechanics #QuantumTheory #FieldTheory #Space #SpaceTime #QuantumFieldTheory #CloserToTruth #RobertKuhn

#DeanRickles - Is #Time #Fundamental?

https://www.youtube.com/watch?v=1TkPn-QNYtk

#Philosophy #PhilosophyOfTime #Logic #Metaphysics #PhilosophyOfScience #Science #Emergence #Physics #Entropy #StatisticalMechanics #GR #GeneralRelativity #SpecialRelativity #Newton #Einstein #QM #QuantumMechanics #QuantumTheory #FieldTheory #Space #SpaceTime #QuantumFieldTheory #CloserToTruth #RobertKuhn

#DeanRickles - Is #Time #Fundamental?

https://www.youtube.com/watch?v=1TkPn-QNYtk

#Philosophy #PhilosophyOfTime #Logic #Metaphysics #PhilosophyOfScience #Science #Emergence #Physics #Entropy #StatisticalMechanics #GR #GeneralRelativity #SpecialRelativity #Newton #Einstein #QM #QuantumMechanics #QuantumTheory #FieldTheory #Space #SpaceTime #QuantumFieldTheory #CloserToTruth #RobertKuhn

#DeanRickles - Is #Time #Fundamental?

https://www.youtube.com/watch?v=1TkPn-QNYtk

#Philosophy #PhilosophyOfTime #Logic #Metaphysics #PhilosophyOfScience #Science #Emergence #Physics #Entropy #StatisticalMechanics #GR #GeneralRelativity #SpecialRelativity #Newton #Einstein #QM #QuantumMechanics #QuantumTheory #FieldTheory #Space #SpaceTime #QuantumFieldTheory #CloserToTruth #RobertKuhn

#DeanRickles - Is #Time #Fundamental?

https://www.youtube.com/watch?v=1TkPn-QNYtk

#Philosophy #PhilosophyOfTime #Logic #Metaphysics #PhilosophyOfScience #Science #Emergence #Physics #Entropy #StatisticalMechanics #GR #GeneralRelativity #SpecialRelativity #Newton #Einstein #QM #QuantumMechanics #QuantumTheory #FieldTheory #Space #SpaceTime #QuantumFieldTheory #CloserToTruth #RobertKuhn

@GenghisKen
The gravitational field is an illusion - it's just space-time curving according to the mass that was always there in the first place. The effect gives the impression of propagating at c but that doesn't mean anything is emerging from beyond the horizon.
#wibblywobbly #timeywimey #GeneralRelativity #BlackHoles #Gravity

#SethLloyd - Why is #QuantumGravity Key?

https://www.youtube.com/watch?v=mTwlD-mDig0&ab_channel=CloserToTruth

#Philosophy #PhilosophyOfScience #Science #Physics #Reality #Metaphysics #QM #QuantumMechanics #QuantumPhysics #GR #GeneralRelativity #StringTheory #TheoryOfEverything #QuantumGravity #Gravity #Spacetime #Geometry #Clocks #Time #GPS #CloserToTruth #RobertKuhn

#BenMiles - Did #Time Really Pass More Slowly In The Past?

https://www.youtube.com/watch?v=4pUgMqB1tdo&ab_channel=DrBenMiles

#Philosophy #PhilosophyOfScience #PhilosophyOfTime #GR #GeneralRelativity #ReferenceFrame #FrameOfReference #TimeDilation #Gravity #EventHorizon #Infinity #BigBang #Quasar #Quasars #DrBenMiles

#BenMiles - Did #Time Really Pass More Slowly In The Past?

https://www.youtube.com/watch?v=4pUgMqB1tdo&ab_channel=DrBenMiles

#Philosophy #PhilosophyOfScience #PhilosophyOfTime #GR #GeneralRelativity #ReferenceFrame #FrameOfReference #TimeDilation #Gravity #EventHorizon #Infinity #BigBang #Quasar #Quasars #DrBenMiles

#BenMiles - Did #Time Really Pass More Slowly In The Past?

https://www.youtube.com/watch?v=4pUgMqB1tdo&ab_channel=DrBenMiles

#Philosophy #PhilosophyOfScience #PhilosophyOfTime #GR #GeneralRelativity #ReferenceFrame #FrameOfReference #TimeDilation #Gravity #EventHorizon #Infinity #BigBang #Quasar #Quasars #DrBenMiles

#BenMiles - Did #Time Really Pass More Slowly In The Past?

https://www.youtube.com/watch?v=4pUgMqB1tdo&ab_channel=DrBenMiles

#Philosophy #PhilosophyOfScience #PhilosophyOfTime #GR #GeneralRelativity #ReferenceFrame #FrameOfReference #TimeDilation #Gravity #EventHorizon #Infinity #BigBang #Quasar #Quasars #DrBenMiles

#BenMiles - Did #Time Really Pass More Slowly In The Past?

https://www.youtube.com/watch?v=4pUgMqB1tdo&ab_channel=DrBenMiles

#Philosophy #PhilosophyOfScience #PhilosophyOfTime #GR #GeneralRelativity #ReferenceFrame #FrameOfReference #TimeDilation #Gravity #EventHorizon #Infinity #BigBang #Quasar #Quasars #DrBenMiles

Have you seen the latest article from our workshop (non-regular #spacetime #geometry) participants? 👉
Saúl Burgos, José Luis Flores and Jónatan Herrera: The c-completion of Lorentzian metric spaces

#SpacetimeGeometry
#DifferentialGeometry #GeneralRelativity #QuantumCosmology #MathematicalPhysics #Quantum #Cosmology #Relativity #MetricGeometry

@univienna
https://arxiv.org/pdf/2305.02004.pdf

(for the motion picture please visit https://twitter.com/ESIVienna/status/1671167715313344512)

Have you seen the latest article from our workshop (non-regular #spacetime #geometry) participants? 👉
Saúl Burgos, José Luis Flores and Jónatan Herrera: The c-completion of Lorentzian metric spaces

#SpacetimeGeometry
#DifferentialGeometry #GeneralRelativity #QuantumCosmology #MathematicalPhysics #Quantum #Cosmology #Relativity #MetricGeometry

@univienna
https://arxiv.org/pdf/2305.02004.pdf

(for the motion picture please visit https://twitter.com/ESIVienna/status/1671167715313344512)

Have you seen the latest article from our workshop (non-regular #spacetime #geometry) participants? 👉
Saúl Burgos, José Luis Flores and Jónatan Herrera: The c-completion of Lorentzian metric spaces

#SpacetimeGeometry
#DifferentialGeometry #GeneralRelativity #QuantumCosmology #MathematicalPhysics #Quantum #Cosmology #Relativity #MetricGeometry

@univienna
https://arxiv.org/pdf/2305.02004.pdf

(for the motion picture please visit https://twitter.com/ESIVienna/status/1671167715313344512)

#DonLincoln, #Fermilab - Do #Photons #Experience #Time?

https://www.youtube.com/watch?v=6Zspu7ziA8Y&ab_channel=Fermilab

#Science #Physics #Relativity #SpecialRelativity #GeneralRelativity #SpeedOfLight #Mass #ReferenceFrame #FrameOfReference #TimeDilation #LengthContraction #Lorentz