Hi, there. Today some retarded Pi-day celebration equations (there is a longer version of this, that I wish I could publish next year). Some numbers and estimates for pi-related equations: 1st. Hawking radiation temperature (Schwarzschild’s 4d black hole case). (1) … Continue reading

# Category Archives: Units, natural units and metrology

By the time we will find new physics, we have already redefined the SI in terms of base units and fundamental constants. The definition of the new SI is the next one: the SI is the system in which the … Continue reading

“(…)Suzie, what is the Planck constante value?(…)” Nice to see the quantum fundamental constant in any series, but only shallowly. The rest was awful Science, and I guess bad advisors (or even null advisors) where considered to the big scientific … Continue reading

Asian units for length: a non-exhaustive list. 1 Chi (China)= m= cm 1 Chi (Hong-Kong)= m 1 Chi (Taiwan)=1 shaku (Japan)==0.3030 m 1 chek = m 1 tsun = chek (Hong-Kong) 1 tsun = cm (Taiwan, China) 1 fan= tsun … Continue reading

Hi, doctorish ladies and gentlemen! I am going to teach some bits of black hole today. For the simplest static (non-rotatory) black hole, the whole space-time is fully specified by mass , and some constants, like . The critical … Continue reading

Hello, metriplectic followers and friends! I have often written about Stoney units or Planck units in this blog. Indeed, I have a complete thread about systems of units. For Stoney and Planck units, you get some basic units of S.I. … Continue reading

The main challenge we are left to the 21st century and beyond is to unify every interaction into a single theory. Today, we have two main theories: The Standard Model, for particle physics. The cosmological Standard Model, or -CDM, as … Continue reading

The marriage between gravity and quantum mechanics is “complicated”. The best physicists and brightest minds have tried, but only with partial success. String/superstring theory, now M-theory, is a curious story. The another story is canonical quantum gravity, or loop quantum … Continue reading

Hello, world! In the paper Notes on several phenomenological laws of quantum gravity, by Jean-Philippe Bruneton, you find a very interesting discussion I am going to enlarge about the scales of (quantum) gravity. With Planck quantities: … Continue reading

In the previous post, I reviewed very naively and shallowly some of the relationships between duality and gravity, and that from electromagnetic duality. There are many other interesting points. This post is aimed to highlight some issues and works that … Continue reading