What is the first result on Gravity Probe B?

  • Thread starter Thread starter cosmopot
  • Start date Start date
  • Tags Tags
    Gravity Probe
cosmopot
Messages
16
Reaction score
0
What is the first result on Gravity Probe B? Please tell me.
 
Physics news on Phys.org
There are anomalies to be corrected, so that for now the data doesn't have the expected resolution, esp. for the Lense-Thirring measurement. The final results are expected in december. Geodetic effect is anyway confirmed up to 1% for now.
 
Last edited:
This morning's news release from Stanford: http://einstein.stanford.edu/content/press_releases/SU/pr-aps-041807.pdf" .
 
Last edited by a moderator:

Thread 'Describing the Big Bang'

I started reading a National Geographic article related to the Big Bang. It starts these statements: Gazing up at the stars at night, it’s easy to imagine that space goes on forever. But cosmologists know that the universe actually has limits. First, their best models indicate that space and time had a beginning, a subatomic point called a singularity. This point of intense heat and density rapidly ballooned outward. My first reaction was that this is a layman's approximation to...
View full post »
Thread 'Dirac's integral for the energy-momentum of the gravitational field'

Thread 'Dirac's integral for the energy-momentum of the gravitational field'

See Dirac's brief treatment of the energy-momentum pseudo-tensor in the attached picture. Dirac is presumably integrating eq. (31.2) over the 4D "hypercylinder" defined by ##T_1 \le x^0 \le T_2## and ##\mathbf{|x|} \le R##, where ##R## is sufficiently large to include all the matter-energy fields in the system. Then \begin{align} 0 &= \int_V \left[ ({t_\mu}^\nu + T_\mu^\nu)\sqrt{-g}\, \right]_{,\nu} d^4 x = \int_{\partial V} ({t_\mu}^\nu + T_\mu^\nu)\sqrt{-g} \, dS_\nu \nonumber\\ &= \left(...
View full post »

Thread 'A sufficient condition for integrability of equation ##\nabla g=0##'

In Philippe G. Ciarlet's book 'An introduction to differential geometry', He gives the integrability conditions of the differential equations like this: $$ \partial_{i} F_{lj}=L^p_{ij} F_{lp},\,\,\,F_{ij}(x_0)=F^0_{ij}. $$ The integrability conditions for the existence of a global solution ##F_{lj}## is: $$ R^i_{jkl}\equiv\partial_k L^i_{jl}-\partial_l L^i_{jk}+L^h_{jl} L^i_{hk}-L^h_{jk} L^i_{hl}=0 $$ Then from the equation: $$\nabla_b e_a= \Gamma^c_{ab} e_c$$ Using cartesian basis ## e_I...
View full post »

Similar threads

B Question about “Inertia arises from interaction with the Universe’s mass”
Replies
13
Views
1K
I Gravity at Schwarzschild Radius of a Black Hole
Replies
17
Views
3K
I Can Time Dilation Probes Redefine Our Understanding of Space and Time?
Replies
14
Views
2K
I Suggestion for 2 more GR tests
Replies
20
Views
2K
B Question about "odometer" analogy and time dilation
Replies
34
Views
2K
I Who is Moving Faster: Planet or Probe?
Replies
38
Views
4K
I Measuring Light Reflection in a Black Hole
2
Replies
89
Views
5K
B Can frame dragging do this?
Replies
1
Views
103
B Gravity and speed of information for orbiting planets
Replies
22
Views
514
Gravity Probe B and Our 4-Dimensional World: Does Time Stand Still?
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top