When I first came to Imperial College, I had many conversations with scientists of all types: theorists, experimentalists; some working on vast international projects, others in small groups or partnerships; some are PhD students, beginning their careers and others are seasoned experts.

A selection of these exchanges are documented here, mostly in the form of an essay in an attempt to capture the essence and narrative of the discussion and strike a resonance.  These writings are shown with the permission of the physicist.

Entries in Henrik Jensen (2)

Saturday
May052012

Conversation with Nature I

In response to my question: "Oh Nature! I wonder what you are and what language you speak?", mathematician and physicist, Henrik Jeldtoft Jensen sent this letter on behalf of Nature, illustrated with his watercolour painting:

A water colour painted in 1991. It is called a "Detail of Nature" (En natur detalje in Danish). When I painted it I was standing under a big tree and following the shadows cast on the paper by the leaves and branches.

"Of course in reality this is a bit self-indulgent; namely nature conversing with itself. You are part of nature. Are there any entities in the universe which are not part of nature? Aren’t your thoughts or mind waves simply a special example of the dynamics of nature. 

What is nature? The totality of space and time and matter and fields and energies constituting the universe. If our contemplation about nature isn't part of nature what is it then? Are the dynamics of the energy carrying the thought about and the mathematical description of a quantum particle less part of nature than the particle?

Maybe the human mind's contemplation is at one level parallel to waves rolling up against the beach or branches swinging in the wind. At least one common aspect is that matter and energy is in dynamical upheaval. Maybe the main difference is the coordination and imprint. When the mind is contemplating, it involves the part of nature consisting of zillions of neurons that manage to represent and extract patterns of generality. These consist in relationships of some generality between nature’s constituents. Relations or patterns (say the relation between the distance travelled by the descending apple since it was released) are the branch of mind dynamics called mathematics.  Hence one of nature’s dialects is math.

But, as often pointed out by nature herself by use of the vehicle consisting of the minds of, say Zen Buddhists: contemplation and descriptions are parables, never identical to the specific motion and excitations they describe.

Nevertheless, when the part of me called humans muse about myself, we tend to use the language called math. 

What am I? To the part of me called humans, I will in the end always remain restricted to the totality of what dynamical patterns (often known as mind) can be manifested in the part of me called brain."  

Wednesday
Jun152011

Reasons for science and subtle questions of interpretation

It’s our first meeting and we’re sitting in your small office on the fourth floor of Princes Gate our chairs turned towards each other and our legs kicked out.  You ask me what a physicist does.  I tell you that they discover and formulate laws of nature and you emphasise that these laws form a picture, conceptualizing and contextualizing our world.  You tell me that physicists also create new realities; by materializing what otherwise would have been existing only in potentia.
  
Clasping your hands together enthusiastically, you say ‘yes – possibly an artist can help in a small way to communicate some important ideas”………
    
You can help tell people that there is an extremely valuable existential dimension.  Science can help us understand why we exist and the conditions of our existence.  People think it’s dull, but, it is an inherently creative discipline of the human spirit and soul and a great adventure, the exciting prospect of finding things out.  It is worthwhile in its own right and doesn’t need a business case.  ‘Be bold about it’, you say ‘tell people that it is a choice they are consciously making about which path to follow’……‘how you cope with being alive’.
  
You suggest that I explain to people that the "world isn't just there".....to be observed, giving absolute answers.  It is not black and white; it reveals itself according to the questions we ask.  We affect it by our observations and we know that two observers moving fast relative to each other and the speed of light may each give different though correct reports of the same series of events.    We conclude that there is an objective reality, though taking into account these complexities; it is possibly unknowable in a complete exhaustive form.   
  
Nature through physics demands that we carefully define the experimental context to understand a subtler world and the results lead us to embrace a multiplicity of points of view.  We both wonder if these are important lessons from nature for our wider world that seems so quick to pass judgment.  Niels Bohr famously said we are actors and spectators and you say  that Bohr is referring to physics ‘namely that an electron can appear either as a particle or as a wave and that we as actors to some extent determine what we see as spectators.’  Though, when I read Bohr’s lectures, I find that like us, he also speaks more broadly, drawing parallels with society, and proposing that we seek to understand context and cultural complexities more before deciding or judging.
  
We talk about how context affects our experiences of everyday things.  You have a music manuscript at home and the design on the cover looks like a funny head, but when seen in the context of your cellos, looks like two cellos.  I say how a painting with blue in it becomes bluer when against a blue wall.  And you say ‘colour theory – yes a good example’.  Or how a painting viewed under different lighting conditions will appear transformed.
  
You tell me that there are parallels with the Buddhist idea of emptiness where the human conception of things is at a distance from reality and you say that things in themselves are not inherently something specific:  ‘is the water in a bucket cold or warm. It depends whether you compare it with ice or steam. ……the attributes we give the world are never independent of us.  Reality is the combined state of nature and our perception of it’.  And you tell me about the Dalai Lama and his fascination with modern physics and exploring connections with Buddhism and suggest I read his book ‘The Universe in an Atom’.
   
You wonder if this project could show that reality is bigger than what we perceive.  That discovery through science is an infinite progression; that mysteries will always be left; that we cannot "grasp the outside of the box from the inside".  Maybe you say, ‘Heaven is what is outside’.
   
You work with complexity networks and our entire world is made of levels of complexity: atoms, to molecules, cells, organisms (animals, plants) and so on up, to as Richard Feynman would say ‘evil, and beauty and hope’.  And you use statistical mechanics to understand how one level leads to the emergence of the next.  You regard emergence as central to scientific enquiry and you say that concentrating our efforts just on looking at more and more fundamental particles is ‘the road to nowhere’.
  
We talk about art that has reflected what modern science has discovered about the world.  You mention Dali and his melting watches that hint at the discovery that our world is not mechanistic and that our sense of time is relative.  And Cubism, which speaks of our multiple perceptions of things rather than the dogma of single or double point perspective.
  
You tell me that we need many different forms to capture the richness of reality: poetry, painting, music, mathematics, physics.  They are all trying to do the same thing.
  
  
Henrik Jeldtoft Jensen is a theoretical physicist focusing on the science of complex systems.  He believes that the world around us can only be grasped in its amazing wonderful richness by the combined effort of the arts, science and philosophy. He believes that this is of particular importance in the realms of teaching.  He paints and likes to play the violin. More information