Of course we can't see it if it is not there. If it is there and does not interact with light that does not preclude us from capturing a sample and bringing it back to not look at. Maybe we could weigh it ?[/url]https://www.youtube.com/watch?v=XTipCQxJ6Ak

Why the need to "go out and bring in samples".
Surely some Dark Matter particles is already here on our Earth giving the massive quantites there is in our Universe.
Problem is though that you cannot detect Dark Matter particles directly, only by side effects.
That is if the scientists theories are correct of course.

All bottles I know of operate by electromagnetic force. Dark Matter ignores that force. You tell me how to collect a sample when it passes through the wall of the bottle.

We are a long way from CERN at LIGO, but ...
There has to be a force carrier for gravity. We have named it the graviton. Unlike the photon it will be a tensor. Until we have some naked gravitons in the right detectors we will not know what their decay products are, or if they even do decay. There are bound to be some very interesting things going on, perhaps an entire additional standard model built around them. Undoubtedly one or several of those things will be what we call dark matter today, and some others may well be dark energy.

We must look or we are dead as a species.

A tensor is a mathematical object that is a generalization of the concepts scalar, vector and linear operator.
Just a description how objects in our Universe are relating to each other and is applied on every objects, photons, electrons, the Earth and whatever.
And Dark Matter and Dark Energy is totally different things. Actually you could call them Gravity and Anti-Gravity.
To bring this further.
It's true that the Standard Model is not complete.
That model highly suggest that Gravity should have a force carrier aka the Graviton and perhaps also an anti-graviton.
And since our Universe seems to prefer duality which lead to the question if the Standard Model has a mirror model.
Some scientists think it have. Sparticles...
https://en.wikipedia.org/wiki/Superpartner
But that's very off topic:)

All bottles I know of operate by electromagnetic force. Dark Matter ignores that force. You tell me how to collect a sample when it passes through the wall of the bottle.

Why not use the quantum tunneling effect?
https://en.wikipedia.org/wiki/Quantum_tunnelling.
We are all part of the Quantum World.

Hello!

The thread has gone into different directions. There is a thread for dark matter. Cern news and topic only. Thanks!

---

The usefulness of useless knowledge
https://home.cern/news/opinion/physics/usefulness-useless-knowledge

I cannot emphasise enough the importance for humanity of the pursuit of “useless knowledge”, as so brilliantly laid out by Abraham Flexner, a founder of the Institute for Advanced Study in Princeton, in his ­article, published in 1939, “The usefulness of useless knowledge”. It is up to governments to ensure that fundamental science can flourish for the benefit of future generations – and that we don’t miss the next Einstein or Leonardo.

Great insight but it has a price.
Anyway.
https://home.cern/news/news/knowledge-sharing/new-small-scale-accelerator-help-study-heritage-artworks

Particle accelerators find several uses outside fundamental physics research. Following the first “miniature” accelerator developed for a compact injector for proton therapy, CERN has been building a new transportable high-frequency accelerator for use in the examination of art masterpieces.

Why is the Universe made up from matter and not antimatter? At CERN they have created some antiatoms made up from an antiproton and an antielectron (positron) and they fall in a gravitational field exactly as ordinary atoms.
Tullio

---

Why is the Universe made up from matter and not antimatter?

This is an answer from CERN physicists.
https://home.cern/science/physics/matter-antimatter-asymmetry-problem

Physicists may find hints as to what this process might be by studying the subtle differences in the behaviour of matter and antimatter particles created in high-energy proton collisions at the Large Hadron Collider. Studying this imbalance could help scientists paint a clearer picture of why our universe is matter-filled.

The fact is that no one really knows.
Could it be that nothing is perfect, not even basic natural laws in our Universe?
Just some very tiny failures when our Universe was created?
But we really want to know so we invest a lot of money to get the answer.

One thought occurs-- If the universe were initially made of a homogeneous mixture of matter and anti-matter, wouldn't the two would have rather quickly destroyed each other? If so, we wouldn't be here to wonder why matter appears to predominate.

One thought occurs-- If the universe were initially made of a homogeneous mixture of matter and anti-matter, wouldn't the two would have rather quickly destroyed each other? If so, we wouldn't be here to wonder why matter appears to predominate.

And theory predicts a near precise 50/50 ratio, which obviously means it is wrong and there is something else at work.

One thought occurs-- If the universe were initially made of a homogeneous mixture of matter and anti-matter, wouldn't the two would have rather quickly destroyed each other? If so, we wouldn't be here to wonder why matter appears to predominate.

Aha. You want to know. Just send a huge pay check to CERN and they will build a very large collider to recreate the Big Bang.
Just kidding:)
As a matter of fact our Universe was created with a homogeneous mixture of matter and anti-matter, according to scientists.
But not homogeneous enough and in the first minutes almost every matter was annihilated.
An estimated one part of one billion of that matter wasn't annihilated.
The rest is what we now can observe in our Universe.

Somebody mentioned Gravity...hmm...
get this man on the team. :-)
Gravity is heavy so thought some "light" relief...
:-)

I've heard on Radio3 Scienza two Italian scientists from the Istituto Nazionale di Fisica Nucleare, an experimental physicist (woman) and a theoretical physicist (male). They both would like a joint venture with China on a new accelerator of 100 km circumference but they must deal with Uncle Sam.
Tullio

---

The Simple Case For Why Physics Needs A Particle Collider Beyond The LHC

There's a problem with the field of high-energy physics, and it's the biggest one imaginable. On the one hand, we have the Standard Model of particle physics: a quantum field theory that describes the particles of the Universe and how they interact. From nuclear reactors to radioactive decays to cosmic particles to high-energy accelerators, the Standard Model has passed every experimental test ever devised.

Way to expensive.

---

Lynn, thanx for the good read.

---

But unless we try we'll never know. ;-)

Cheers.

In my humble opinion, gravitation physics is the new bleeding edge. LIGO and VIRGO are being updated, KAGRA in Japan should start within the year and Advanced LIGO in India is being built. When 4 or more interferometers will be working, this will give astronomers the capability of pinpointing sources of gravitational waves and observing them with optical, radio, X-rays and gamma ray telescopes. Energies in the Universe are much higher than those available from particles accelerators. Astrophysics is the new frontier of physics.
Tullio

---

But unless we try we'll never know. ;-)

Yes and with basic research you never know what you will find. Perhaps a method to FTL.

But unless we try we'll never know. ;-)

Yes and with basic research you never know what you will find. Perhaps a method to FTL.

I'm a dreamer, but I'm not the only one (J. Lennon)
Assignment of the Science is not to open a door to endless know,
but to set a barrier to the endless ignorance. (Galileo Galilei by Bertolt Brecht)
The probability of success is difficult to estimate;
but if we never search, the chance of success is zero. (Cocconi-Morrison, Searching for Interstellar Communications, Nature, September 19, 1959)

Gary - - - FTL ??????

Cheers,
byron

Byron, FTL Faster Than Light. Once we know the graviton we might find out how to get around the limits of the speed of light by perhaps bending the universe in such a way that the distance between A and B is less.