> While objects cannot move faster than light, this limitation only applies with respect to local reference frames and does not limit the recession rates of cosmologically distant objects
Given that v is velocity in the opposite direction, and c is the constant reference frame speed of light; do we account for velocity in determining whether light traveling at c towards earth will ever reach us?
v - c < 0 if v>c
v + c > c if v>0
Are tachyons FTL, is there entanglement FTL?
How far away in light years does a mirror in space need to be in order to see dinosaurs that existed say 100 million years ago?
Tachyons aren't a thing. Tachyons are sci-fi nonsense.
Nothing in the universe can travel faster than the speed of light. This does not hold for the universe itself. It can and does expand faster than the speed of light, using specific reference frames (i.e., big enough).
So, space can increase FTL. Particles do not travel faster than light tho, that is nonsense.
If the universe is expanding faster than the speed of light, how are particles not traveling faster than the speed of light indeed with zero acceleration relative to the expansion?
If the Copenhagen interpretation is correct, particle states are correlated after a photonic beam splitter; if you measure entangled photons after a beam splitter, their states are still linked.
If virtual particle states are entangled with particle states in black holes or through ER=EPR bridges, is there effectively FTL?
Take a star in a region of the universe that recedes from us at 3c. In what sense is the star not traveling faster than the speed of light relative to us?
Well, we have (virtual) particles that can travel backwards in time, without breaking causality. There's no proof that Tachyons exist, they are purely hypothetical, but they are not outright nonsense.
> do we account for velocity in determining whether light traveling at c towards earth will ever reach us?
No, because the speed of light is constant for all observers. From our frame of reference on earth, light from distant receding galaxies is always moving towards us at exactly the speed of light, c. Those galaxies also observe the light moving away from them at exactly c.
That seems contradictory and unintuitive, that two observers moving away from each other both measure light moving c relative to themselves, but that’s reality.
It’s another measurement that changes: if c is always constant, then it must be the passage of time and the distance travelled that we observe differently.
> That seems contradictory and unintuitive, that two observers moving away from each other both measure light moving c relative to themselves, but that’s reality.
Light is a wave. Photon is a complex thing (Hopfion?), but it's a wave, so it waves something, a medium. Speed of wave propagation in a medium is constant. IMHO, it's intuitive.
Gravitational waves existing doesn't confirm the existence of a medium any more than discovering light behaves like a wave confirms the existence of the aether.
If you want to posit that light has a medium, you need to redo 100 years of physics, so start showing your work. You mention elsewhere "doing a calculation", and that's just not nearly good enough. You want to overturn perfectly working physics, you NEED to show up with receipts. That's table stakes.
> do we account for velocity in determining whether light traveling at c towards earth will ever reach us?
As far as I know this is not necessary because the speed of light is constant regardless of the velocity of both the source and the observer (this is Einstein's special relativity: https://en.m.wikipedia.org/wiki/Special_relativity)
>> While objects cannot move faster than light, this limitation only applies with respect to local reference frames and does not limit the recession rates of cosmologically distant objects
Then the length traveled changes for two photons emitted when they cross the starting line at different velocities:
const d = distance = 1
# d_start = 0
# d_finish = d
c: Velocity # of a photon in a vacuum
v1: Velocity # of photon emission source 1
v2: Velocity # of photon emission source 2
v1 + c != v2 + c
distance / (v1 + c) ?= distance / (v2 + c)
((v1 + c)*t) - ((v2+c)*t) ?!= 0
Should (v + c) be prematurely reduced to just (c), with a confirmed universal expansion rate?
> How far away in light years does a mirror in space need to be in order to see dinosaurs that existed say 100 million years ago?
A mirror in a vacuum 1ly away will return the photonic signal from t=0 at t=2 light years, with diffraction (due to matter in [solid, liquid, gas, plasma, and superfluid/superconductor] phases describable with superfluid quantum gravity (e.g. Fedi's with Bernoulli pressure))
# m = meters
# s = f(decay_rate_of_cesium_atom)
# c = const x: meters/second
Time = TimeInLightYears
t_tx = t_transmitted: Time = 0
t_rx = t_received: Time
d = distance: Time
# d == d_ab == d_ba
# t_tx, d, t_rx,
test_data = [
[0, 0, 0.0],
[0, 2, 1],
[0, 1, 0.5],
[-1, 0, None],
[-100e6, 0, None], # dinosaurs
]
@pytest.mark.parametrized('t_tx, d, t_rx', test_data)
def test_test_data(ttx, d, trx'):
assert trx == ttx + (2*d)
m = scattering_matrix: # FluidDiffractionTensorMatrix
assert is_YangBaxterMatrix(m)
A water droplet [in space] reflects enough [photonic,] information to recover a modulated signal and also a curvilinear transformation of Escher looking into a crystal ball, with c the speed of light as a consideration only at cosmological distances.
How large of water droplet, a regular or irregular spheroid or reflective and/or lensing matter configuration is necessary to reflect a sufficient amount of photonic information to recover information from cosmological information medium, in terms of constructor theory?
Expansion of the universe: https://en.wikipedia.org/wiki/Expansion_of_the_universe :
> While objects cannot move faster than light, this limitation only applies with respect to local reference frames and does not limit the recession rates of cosmologically distant objects
Given that v is velocity in the opposite direction, and c is the constant reference frame speed of light; do we account for velocity in determining whether light traveling at c towards earth will ever reach us?
Are tachyons FTL, is there entanglement FTL?How far away in light years does a mirror in space need to be in order to see dinosaurs that existed say 100 million years ago?