Do scalar fields exist across the whole universe? Unlike gravitational or magnetic fields, which have both strength and direction, scalar fields have strength alone, varying from point to point.

They definitely exist within some closed systems, such as the temperature distribution within the earth’s atmosphere, but it is not yet known whether they exist on the scale of the universe.

It's a vital question because the existence of scalar fields could help explain how the universe developed after the Big Bang and became as we observe it today. For example scalar fields could explain the existence of dark matter and energy, which can only be observed indirectly from their gravitational effects on the part of the universe we can see.

It was a key issue at the Astrophysical Tests Of Fundamental Physics conference recently held in Porto, Portugal.

The key, it was determined, will be 'bilingual' researchers. Not in cultural languages, but science ones, like astronomical observation and theory.

It means taking astronomy back to its roots. Early great discoveries were made by the likes of Galileo for whom theory and observation were two sides of the same coin but the field later split, with theorists and observers ceasing to communicate effectively with each other. The emergence of highly sophisticated observing platforms, capable of making different types of measurement depending on theoretical considerations, means that the two are once again becoming closely entwined.

Accurate clocks and space-borne instruments

Two key developments are the ability to take the observing instruments into space, where more accurate observations can be made beyond the influence of the earth’s atmosphere and magnetic field, and availability of high precision atomic clocks for measurement of timing down to nanoseconds.

It has become clear there is a limit to how much can be discovered in earth-bound laboratories, even those as big as the Large Hadron Particle Accelerator run by CERN. The early universe is a natural laboratory with the required scale and energy, providing the potential for probing deeper into fundamental processes relating to matter and energy.

“The idea was to bring together the top European expertise in cosmology, astrophysics and particle physics, get the various sub-communities to be aware of what is being done 'elsewhere', and focus our efforts on using the early universe as a laboratory in which we can probe fundamental physics - in ways that we'll never be able to do if we restrict ourselves to laboratory tests,” said Carlos Martins, convenor of the ESF workshop.

New observations could also help confirm aspects of current theories, such as the existence of gravitational waves as predicted by Einstein’s General Relativity. Gravitational waves are supposed to be ripples through space time radiating outwards from a moving object.

However the ripples are so small as to be very difficult to measure, with the only observational evidence so far coming from pulsars, which are very dense binary neutron stars revolving around each other. The revolution of pulsars appears to slow down in a manner consistent with the existence of gravitational waves causing them to lose energy, but further confirmation is needed.

Finally there is also the prospect of making further progress in the field of astronomy itself, for example by using space borne atomic clocks to calibrate advanced spectrographs that in turn will be used to search for “extra-solar” planets in neighbouring star systems.