Neutrino brži od fotona?

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Šabović Adis
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Re: Neutrino brži od fotona?

Post by Šabović Adis » 26 May 2017, 14:19

Magazine issue: Vol. 187, No. 4, February 21, 2015, p. 7
Jao, tek su, dakle, prije dvije godine skontali da brzina svjetlosti fakat ovisi i o gustini medija kroz koje se svjetlost kreće. :facepalm:

Đeca usedmom osnovne to znaju. :rofl:

BTW, svjetlost se kreće isključivo brzinom svjetlosti.
Neće se valjda kretat' brzinom zvuka... :rofl:


Potpisujem bjanko smrtne presude :mirko:

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haram
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Post by haram » 26 May 2017, 14:39

Šabović Adis wrote:
26 May 2017, 14:19
Jao, tek su, dakle, prije dvije godine skontali da brzina svjetlosti fakat ovisi i o gustini medija kroz koje se svjetlost kreće. :facepalm:

Đeca usedmom osnovne to znaju. :rofl:

BTW, svjetlost se kreće isključivo brzinom svjetlosti.
Neće se valjda kretat' brzinom zvuka... :rofl:
Ma ne kreće se kad joj ponestane sapi... :mig:



MightyMe
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Post by MightyMe » 26 May 2017, 16:45

Šabović Adis wrote:
26 May 2017, 14:19
Jao, tek su, dakle, prije dvije godine skontali da brzina svjetlosti fakat ovisi i o gustini medija kroz koje se svjetlost kreće. :facepalm:

Đeca usedmom osnovne to znaju. :rofl:

BTW, svjetlost se kreće isključivo brzinom svjetlosti.
Neće se valjda kretat' brzinom zvuka... :rofl:
Ma članak je na arxivu još i ranije objavljen:
(Submitted on 14 Nov 2014)


Uglavnom, ništa pretjerano revolucionarno, ako se pročita abstract:
That the speed of light in free space is constant is a cornerstone of modern physics. However, light beams have finite transverse size, which leads to a modification of their wavevectors resulting in a change to their phase and group velocities. We study the group velocity of single photons by measuring a change in their arrival time that results from changing the beam's transverse spatial structure. Using time-correlated photon pairs we show a reduction of the group velocity of photons in both a Bessel beam and photons in a focused Gaussian beam. In both cases, the delay is several microns over a propagation distance of the order of 1 m. Our work highlights that, even in free space, the invariance of the speed of light only applies to plane waves. Introducing spatial structure to an optical beam, even for a single photon, reduces the group velocity of the light by a readily measurable amount.



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Šabović Adis
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Post by Šabović Adis » 26 May 2017, 17:12

A kako se prevodi ovaj fri spejs? Jel' im to vakum? Prazan prostor?!


@Haro
Bez prostora ni prostiranja nema, isto k'o ni brzine bez vremena. :zubo:


Potpisujem bjanko smrtne presude :mirko:

MightyMe
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Joined: 07 Oct 2011, 15:32

Post by MightyMe » 26 May 2017, 21:21

Aha, mislin da je to to. Te dvi riči bi tribale značit više manje istu stvar.



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