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On 25/09/2025 08:21, Jan Panteltje wrote:
The phantom heat of empty space might soon be detectable
Solves a long-standing challenge in fundamental physics.
Date:
September 24, 2025
Source:
Hiroshima University
Summary:
A Hiroshima University team has designed a feasible way to detect the Unruh effect, where acceleration turns quantum vacuum fluctuations into observable particles. By using superconducting Josephson junctions, they can achieve extreme accelerations that create a detectable Unruh temperature. This produces measurable voltage jumps, providing a clear signal of the effect. The breakthrough could transform both fundamental physics and quantum technology.
Link:
https://www.sciencedaily.com/releases/2025/09/250924012234.htm
It is possibly interesting if it can be reproduced and confirmed in
other labs - as in Noble prize winning experimental technique...
The edges of GR and QM are rather tricky to deal with. Neither one is >entirely consistent with the foundations of the other. A new more
complete theory of physics fully encompassing both is needed.
Such breakthroughs and paradyme shifts usually start with someone
observing something that isn't quite what present theories predict.
On Thu, 25 Sep 2025 13:35:43 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 25/09/2025 08:21, Jan Panteltje wrote:
The phantom heat of empty space might soon be detectable
Solves a long-standing challenge in fundamental physics.
Date:
September 24, 2025
Source:
Hiroshima University
Summary:
A Hiroshima University team has designed a feasible way to detect the Unruh effect, where acceleration turns quantum vacuum fluctuations into observable particles. By using superconducting Josephson junctions, they can achieve extreme accelerations that create a detectable Unruh temperature. This produces measurable voltage jumps, providing a clear signal of the effect. The breakthrough could transform both fundamental physics and quantum technology.
Link:
https://www.sciencedaily.com/releases/2025/09/250924012234.htm
It is possibly interesting if it can be reproduced and confirmed in
other labs - as in Noble prize winning experimental technique...
The edges of GR and QM are rather tricky to deal with. Neither one is
entirely consistent with the foundations of the other. A new more
complete theory of physics fully encompassing both is needed.
Such breakthroughs and paradyme shifts usually start with someone
observing something that isn't quite what present theories predict.
Or to provide something for the university publicity department to do.
On 26/09/2025 1:17 am, john larkin wrote:
On Thu, 25 Sep 2025 13:35:43 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 25/09/2025 08:21, Jan Panteltje wrote:
The phantom heat of empty space might soon be detectable
Solves a long-standing challenge in fundamental physics.
Date:
-a-a September 24, 2025
Source:
-a-a Hiroshima University
Summary:
-a-a A Hiroshima University team has designed a feasible way to detect >>>> the Unruh effect, where acceleration turns quantum vacuum
fluctuations into observable particles. By using superconducting
Josephson junctions, they can achieve extreme accelerations that
create a detectable Unruh temperature. This produces measurable
voltage jumps, providing a clear signal of the effect. The
breakthrough could transform both fundamental physics and quantum
technology.
Link:
-a-a https://www.sciencedaily.com/releases/2025/09/250924012234.htm
It is possibly interesting if it can be reproduced and confirmed in
other labs - as in Noble prize winning experimental technique...
The edges of GR and QM are rather tricky to deal with. Neither one is
entirely consistent with the foundations of the other. A new more
complete theory of physics fully encompassing both is needed.
Such breakthroughs and paradyme shifts usually start with someone
observing something that isn't quite what present theories predict.
Or to provide something for the university publicity department to do.
The university publicity department is no more capable of assessing the value of new work than Jan Panteltje or you. Martin Brown is probably
better placed, but if the work isn't in a area he has actually worked on there won't be a lot in it.
https://en.wikipedia.org/wiki/Unruh_effect
How on a earth a super-conducting Josephson junction could create an an extreme acceleration escapes me. All the components of the junction have
to stay in the same place for it to work as a Josephson junction.
On 26/09/2025 07:14, Bill Sloman wrote:
On 26/09/2025 1:17 am, john larkin wrote:
On Thu, 25 Sep 2025 13:35:43 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 25/09/2025 08:21, Jan Panteltje wrote:
The phantom heat of empty space might soon be detectable
Solves a long-standing challenge in fundamental physics.
Date:
-a-a September 24, 2025
Source:
-a-a Hiroshima University
Summary:
-a-a A Hiroshima University team has designed a feasible way to
detect the Unruh effect, where acceleration turns quantum vacuum
fluctuations into observable particles. By using superconducting
Josephson junctions, they can achieve extreme accelerations that
create a detectable Unruh temperature. This produces measurable
voltage jumps, providing a clear signal of the effect. The
breakthrough could transform both fundamental physics and quantum
technology.
Link:
-a-a https://www.sciencedaily.com/releases/2025/09/250924012234.htm
It is possibly interesting if it can be reproduced and confirmed in
other labs - as in Noble prize winning experimental technique...
The edges of GR and QM are rather tricky to deal with. Neither one is
entirely consistent with the foundations of the other. A new more
complete theory of physics fully encompassing both is needed.
Such breakthroughs and paradyme shifts usually start with someone
observing something that isn't quite what present theories predict.
Or to provide something for the university publicity department to do.
The university publicity department is no more capable of assessing
the value of new work than Jan Panteltje or you. Martin Brown is
probably better placed, but if the work isn't in a area he has
actually worked on there won't be a lot in it.
https://en.wikipedia.org/wiki/Unruh_effect
It is slightly less exciting than it sounded in the announcement.
They have *proposed* a possible experiment that might reveal such an
Unruh effect in Phys Rev Lett (a highly reputable Physics journal).
https://journals.aps.org/prl/abstract/10.1103/mn34-7bj5
Reading the press release I thought they had done the experiment - which
if it worked would be incredibly impressive.
How on a earth a super-conducting Josephson junction could create an
an extreme acceleration escapes me. All the components of the junction
have to stay in the same place for it to work as a Josephson junction.
I too am mystified by how they obtain huge acceleration and have the Josephson junction still work.
I gather from what I can access free on arXiv that it involves an
annular JJ (whatever one of those is). When I am next somewhere with
free access to PRL I will take a look see at their paper.
I don't understand how they obtain the huge acceleration required
either, but the peer reviewers were satisfied given it was published. I
look forward to someone doing it and reporting their results.
Measuring Plank's constant using the then very new Josephson junction apparatus was a final year practical experiment in my Physics course.
ISTR it involved a niobium cat's whisker carefully manipulated inside a liquid helium filled dewar inside a normal dewar of LN2. The staircase waveform was rather pretty as the linked magnetic flux changed.
On 26/09/2025 09:54, Martin Brown wrote:
Measuring Plank's constant using the then very new Josephson junction
apparatus was a final year practical experiment in my Physics course.
ISTR it involved a niobium cat's whisker carefully manipulated inside
a liquid helium filled dewar inside a normal dewar of LN2. The
staircase waveform was rather pretty as the linked magnetic flux changed.
I remember doing that practical.-a We had to make the cat's whisker by grinding a short length of niobium wire to a fine point.-a The key to
success was getting the tip hot enough to produce the optimum
thickness of niobium oxide on the surface.-a With too much or too little oxide it would not work.
PS, was just reading this:
The surprising new particle that could finally explain dark matter
Date:
September 25, 2025
Source:
University of Warsaw, Faculty of Physics
Summary:
Physicists are eyeing charged gravitinosrCoultra-heavy,
stable particles from supergravity theoryrCoas possible Dark Matter candidates.
Unlike axions or WIMPs, these particles carry electric charge but remain undetectable due to their scarcity.
With detectors like JUNO and DUNE, researchers now have a chance to spot their unique signal,
a breakthrough that could link particle physics with gravity.
Link:
https://www.sciencedaily.com/releases/2025/09/250925025403.htm
So, that electric charge is interesting,
as it points to EM radiation, links gravity to EM radiation
Same idea as I had about possible 'spin' in LS particles.
On 26/09/2025 07:14, Bill Sloman wrote:
On 26/09/2025 1:17 am, john larkin wrote:
On Thu, 25 Sep 2025 13:35:43 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 25/09/2025 08:21, Jan Panteltje wrote:
The phantom heat of empty space might soon be detectable
Solves a long-standing challenge in fundamental physics.
Date:
-a-a September 24, 2025
Source:
-a-a Hiroshima University
Summary:
-a-a A Hiroshima University team has designed a feasible way to
detect the Unruh effect, where acceleration turns quantum vacuum
fluctuations into observable particles. By using superconducting
Josephson junctions, they can achieve extreme accelerations that
create a detectable Unruh temperature. This produces measurable
voltage jumps, providing a clear signal of the effect. The
breakthrough could transform both fundamental physics and quantum
technology.
Link:
-a-a https://www.sciencedaily.com/releases/2025/09/250924012234.htm
It is possibly interesting if it can be reproduced and confirmed in
other labs - as in Noble prize winning experimental technique...
The edges of GR and QM are rather tricky to deal with. Neither one is
entirely consistent with the foundations of the other. A new more
complete theory of physics fully encompassing both is needed.
Such breakthroughs and paradyme shifts usually start with someone
observing something that isn't quite what present theories predict.
Or to provide something for the university publicity department to do.
The university publicity department is no more capable of assessing
the value of new work than Jan Panteltje or you. Martin Brown is
probably better placed, but if the work isn't in a area he has
actually worked on there won't be a lot in it.
https://en.wikipedia.org/wiki/Unruh_effect
It is slightly less exciting than it sounded in the announcement.
They have *proposed* a possible experiment that might reveal such an
Unruh effect in Phys Rev Lett (a highly reputable Physics journal).
https://journals.aps.org/prl/abstract/10.1103/mn34-7bj5
Reading the press release I thought they had done the experiment - which
if it worked would be incredibly impressive.
How on a earth a super-conducting Josephson junction could create an
an extreme acceleration escapes me. All the components of the junction
have to stay in the same place for it to work as a Josephson junction.
I too am mystified by how they obtain huge acceleration and have the Josephson junction still work.
I gather from what I can access free on arXiv that it involves an
annular JJ (whatever one of those is). When I am next somewhere with
free access to PRL I will take a look see at their paper.
I don't understand how they obtain the huge acceleration required
either, but the peer reviewers were satisfied given it was published.
I look forward to someone doing it and reporting their results.
Measuring Plank's constant using the then very new Josephson junction apparatus was a final year practical experiment in my Physics course.
ISTR it involved a niobium cat's whisker carefully manipulated inside a liquid helium filled dewar inside a normal dewar of LN2. The staircase waveform was rather pretty as the linked magnetic flux changed.