一位美国科幻小说家看到我的一篇论文，问中子自旋能否改变时空？
一位美国科幻小说家看到我的一篇论文，问中子自旋能否改变时空？
Dear Jian-Qi Shen,
I am a science fiction writer living in the United States, along with my
writing partner who I'm copying on this e-mail. I recently read part of yo
ur paper dated May 26, 2003 entitled "Neutron-gravity interferometry experim
ent: testing Earth's rotating frequency fluctuations via neutron Berry's pha
ses due to spin-rotation couplings."
I don't want to waste your time or even pretend I understand any of the
equations you reference in your work, but I am curious and would appreciate
any insights an expert like yourself might offer.
In our next screenplay, the protagonist must unlock the secrets of gravi
ty and create devices or 'plates' which create artificial gravity. We want
his solution to be based on some type of scientific reality, in-line with th
e very latest thoughts and findings on the subject. Our thoughts are that h
e creates a device which through the manipulation of neutron spin of the mas
s of the "plate", can create gravitational pull.
Clearly, there is some link between neutron spin and gravity. Any thoug
hts you may have on the subject would be beneficial to us. Also, do you thi
nk the link between the Earth's rotating frequency and TIME could be altered
by neutron spin manipulation?
I look forward to any reply you might have and wish you the best luck in
your further studies and thoughts on the subject.
Sincerely,
Kenny Frey
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Dear Kenny Frey,
Thanks for your interest in my paper.
I think that it is very essential to write fiction stories based on real sci
entific mechanisms and principles (rather than on the purely illusory though
ts).
As far as the creation of artificial gravity is concerned, I think that you
can be referred to Li Ning and Torr’ s work，where they investigated the in
teraction between electromagnetic force and gravity in a superconductor. Spe
cifically, by solving the London’s equations governing the superconducting
electrons, they showed that the electromagnetic interaction (coexisting with
the gravity) in a superconductor may induce a strong gravity (about 100 mil
lions times stronger than that on the Earth), and vice versus. These works m
ay be seen in: Phys. Rev. D, vol 43,No.2, pp.457(1991); Phys. Rev.B vol.64,n
o.9,pp.5489(1992); Foundations of Physics Letters, vol.6, no.4, pp.371(1993)
.
Personally speaking, Li Ning and Torr’ s work is related close to the so-ca
lled anti-Meissner effect (see, for example, my paper attached to this email
) and their mathematical procedure is correct. However, their result (i.e.,
inducing about 100 millions times stronger than that on the Earth) is not ve
ry physically realistic. The reason for this is as follows: before they indu
ce such a strong gravity, the applied superconductor has already been destro
yed by the strong gravity. So, their induced stronger gravity cannot be esta
blished in ordinary superconducting materials on the Earth. Maybe their resu
lt holds true in the neutron star where the neutrons also possess the superc
onducting properties.
Another illustrative example of artificial gravity is the work of E.Podkletn
ov (see in: Physica C, vol. 203,pp.441, 1992). E.Podkletnov’s experiment de
monstrated that the rotating superconductor may shield the gravity (i.e., a
2% reduction in weight of the body near the rotating superconductor is creat
ed). I think that this phenomenon is in connection with the gravitational Ba
rnett effect. Although E.Podkletnov’s surprising experimental result could
not be realized by other researchers so far, some theorists offered a theory
as to why this effect might occur via quantum gravitational effects: specif
ically, a local change to the cosmological constant (i.e., vacuum zero-point
quantum fluctuation energy) in the superconductor and therefore the gravita
tional properties of gravitating source (the rotating superconductor) alters
much.
Personally speaking, although this theoretical mechanism is based on real ph
ysical principle, it won’t take place on the Earth since the density of mat
ter on the Earth is too small to cut off the vacuum quantum fluctuation ener
gy with high frequency and the local change to the vacuum quantum fluctuatio
n energy is therefore not obvious. Only in the high-density matter such as t
he neutron star can this effect occur, for the spinning magnetic moment of t
he matter with high density in neutron star will cancel (repel) the high-fre
quency vacuum quantum fluctuation energy. Thus the shielding effect of gravi
ty in neutron star will be possible due to the considerable cancellation of
vacuum quantum fluctuation.
According to Einstein’s general relativity, the rotation of a body will res
ult in the space-time curvature, and consequently lead to the neutron spin-g
ravity coupling. On the other hand, the neutron spin will also affect the gr
avity (i.e. the space-time curvature). But this influence on space-time curv
ature is negligibly small on the Earth. Just similar to the above case (the
local change to quantum fluctuation energy), only in the high-density matter
will the particle spin (and the spinning magnetic moment) have considerable
influence on the electromagnetic field and consequently on the gravitation.
I think in your screenplay, in order to create the artificial gravity, the d
evices or “plates” employed should be composed of high-density matter (suc
h as neutron star matter). When you want to create a gravitational pull, you
may make all the neutron spin polarized by means of strong magnetic fields
(namely, due to the magnetic properties of spinning magnetic moment of neutr
ons, the vector of all neutron spin will be parallel to the same direction i
n the presence of a strong magnetic field). Thus, the high-density neutron s
pin (via its magnetic properties) will cancel (repel) a great majority of va
cuum quantum fluctuation energy and accordingly the gravitational properties
of “plates” will alter much. So, it is possible for the “plates” to cre
ate a gravitational pull, just like that in the E.Podkletnov’s experiment (
ant-gravity or gravitational shielding) presented above. In a word, you can
obtain opposite gravity pull (and the gravity pull in various directions) on
ly by manipulating the directions of applied strong magnetic fields, which a
cts upon the “plate” made of high-density matter (neutron star matter).
I wish you success in your screenplay!
regards!
Jian qi Shen
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对长为一米的天平动量矩的传递10秒够不够！