One of the problems of string theory is that five different versions of it exist! Four of these are theories with closed strings, which can be visualised with elastic bands that move in space-time.

What does it mean to be to space-time? The seemingly simple question gets to the essence of twentieth-century physics and has ...

Physicists have proposed a new model of space-time that may provide the 'first observational evidence supporting string theory,' a new preprint suggests.

String theory is perhaps the most high-profile candidate for what physicists call a theory of everything – a single ...

At the time, physicists found themselves facing a crisis: the two most important ideas of 20th century physics, relativity and quantum theory, were known to be fundamentally incompatible.

They have always been my living proof of the invisible string theory — that they are intertwined across time and space, I have no doubt of.

Conventional string theory’s predictions are incompatible both with the observation of dark energy, which appears to be causing our universe’s expansion to speed up, and with viable ...

Huge Galaxy String Challenges Space TheoryAn enormous string of galaxies 300 million light-years long has been discovered in the remote Universe, challenging existing theories about how the ...

Technical Terms Moduli Space: A parameter space representing all inequivalent solutions or configurations, often describing vacuum states in string theory.

F-Theory offers a geometric realisation of strongly coupled string theory that extends traditional perturbative methods. By utilising the mathematics of elliptically fibre‐ed Calabi–Yau ...

Scientists say fragments of energy may be the fundamental building blocks of the universe—not particles and waves.