u*q
2 楼
重力传播速度几多?
太阳突然消失,地球立即脱轨,还是八分钟以后才脱?
太阳突然消失,地球立即脱轨,还是八分钟以后才脱?
h*m
3 楼
8周,
要确定不是宫外孕
要确定不是宫外孕
H*g
4 楼
好问题。
l*1
5 楼
13w for me
H*g
6 楼
In September 2002, Sergei Kopeikin and Edward Fomalont announced that they
had made an indirect measurement of the speed of gravity, using their data
from VLBI measurement of the retarded position of Jupiter on its orbit
during Jupiter's transit across the line-of-sight of the bright radio source
quasar QSO J0842+1835. Kopeikin and Fomalont concluded that the speed of
gravity is between 0.8 and 1.2 times the speed of light, which would be
fully consistent with the theoretical prediction of general relativity that
the speed of gravity is exactly the same as the speed of light.[19]
had made an indirect measurement of the speed of gravity, using their data
from VLBI measurement of the retarded position of Jupiter on its orbit
during Jupiter's transit across the line-of-sight of the bright radio source
quasar QSO J0842+1835. Kopeikin and Fomalont concluded that the speed of
gravity is between 0.8 and 1.2 times the speed of light, which would be
fully consistent with the theoretical prediction of general relativity that
the speed of gravity is exactly the same as the speed of light.[19]
r*k
7 楼
7周3天
确定是怀孕,看到了孕囊。
确定是怀孕,看到了孕囊。
H*g
8 楼
所以如果太阳突然爆炸,全变成能量,地球还真的是8分钟才开始走直线。
J*l
9 楼
8周~
听了心跳...确定不是宫外孕..
听了心跳...确定不是宫外孕..
H*g
10 楼
wikipedia说这个测量实验本身有争论,但是对于相对论预测引力波速度等于光速大家
似乎没啥意见。
source
that
【在 H********g 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: In September 2002, Sergei Kopeikin and Edward Fomalont announced that they
: had made an indirect measurement of the speed of gravity, using their data
: from VLBI measurement of the retarded position of Jupiter on its orbit
: during Jupiter's transit across the line-of-sight of the bright radio source
: quasar QSO J0842+1835. Kopeikin and Fomalont concluded that the speed of
: gravity is between 0.8 and 1.2 times the speed of light, which would be
: fully consistent with the theoretical prediction of general relativity that
: the speed of gravity is exactly the same as the speed of light.[19]
似乎没啥意见。
source
that
【在 H********g 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: In September 2002, Sergei Kopeikin and Edward Fomalont announced that they
: had made an indirect measurement of the speed of gravity, using their data
: from VLBI measurement of the retarded position of Jupiter on its orbit
: during Jupiter's transit across the line-of-sight of the bright radio source
: quasar QSO J0842+1835. Kopeikin and Fomalont concluded that the speed of
: gravity is between 0.8 and 1.2 times the speed of light, which would be
: fully consistent with the theoretical prediction of general relativity that
: the speed of gravity is exactly the same as the speed of light.[19]
l*e
11 楼
8周,当时有出血,看看是不是宫外孕~
H*g
12 楼
那引力在水里的话也是光速除以一个引力波的折射率么?
t*u
13 楼
要搞清楚,力,速度,加速度,质量,能量等之间的关系。
速度的数字只是为了满足计算而已。
速度的数字只是为了满足计算而已。
H*g
26 楼
也可能我理解错了。这个“gravitational radiation”是怎么回事?
https://en.wikipedia.org/wiki/Speed_of_gravity
The speed of gravity (more correctly, the speed of gravitational waves) can
be calculated from observations of the orbital decay rate of binary pulsars
PSR 1913+16 (the Hulse–Taylor binary system noted above) and PSR B1534+12.
The orbits of these binary pulsars are decaying due to loss of energy in the
form of gravitational radiation. The rate of this energy loss ("
gravitational damping") can be measured, and since it depends on the speed
of gravity, comparing the measured values to theory shows that the speed of
gravity is equal to the speed of light to within 1%.[18] However, according
to PPN formalism setting, measuring the speed of gravity by comparing
theoretical results with experimental results will depend on the theory; use
of a theory other than that of general relativity could in principle show a
different speed, although the existence of gravitational damping at all
implies that the speed cannot be infinite.[
【在 H********g 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: wikipedia说引力波速度那个页面,说有个星星就有有规律的质量变化,所以观测和它
: 互动的星星可以测引力波的速度。
https://en.wikipedia.org/wiki/Speed_of_gravity
The speed of gravity (more correctly, the speed of gravitational waves) can
be calculated from observations of the orbital decay rate of binary pulsars
PSR 1913+16 (the Hulse–Taylor binary system noted above) and PSR B1534+12.
The orbits of these binary pulsars are decaying due to loss of energy in the
form of gravitational radiation. The rate of this energy loss ("
gravitational damping") can be measured, and since it depends on the speed
of gravity, comparing the measured values to theory shows that the speed of
gravity is equal to the speed of light to within 1%.[18] However, according
to PPN formalism setting, measuring the speed of gravity by comparing
theoretical results with experimental results will depend on the theory; use
of a theory other than that of general relativity could in principle show a
different speed, although the existence of gravitational damping at all
implies that the speed cannot be infinite.[
【在 H********g 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: wikipedia说引力波速度那个页面,说有个星星就有有规律的质量变化,所以观测和它
: 互动的星星可以测引力波的速度。
D*g
29 楼
不过那啥,光是波,也有粒子性。引力是不是波?有没有粒子性?
是波就有波长,引力有波长没?
是波就有波长,引力有波长没?
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