Newton, Einstein si gravitatia

Aparent acest post nu are nici o legatura cu celelalte, la fel cum temele propuse de mine pe acest blog nu pot fi corelate la prima vedere.

Am facut insa aceasta descoperire de curand si ma aflu inca sub influenta entuziasmului, asa ca o postez acum si o vom detalia ulterior.

In ce priveste gravitatea multi au auzit evident de teoriile lui Newton si marul sau devenit istoric.

A venit apoi Einstein cu teoria relativitatii si mecanica cuantica care au incercat sa explice intr-un sens mai larg fenomenul gravitatii. Au ramas insa "mici" probleme nerezolvate in care cele doua teorii mai aveau lacune, care incearca acum sa fie explicate prin diferite experimente. Unul din acestea e faimosul accelerator de particule LHC pe tema caruia s-a facut atata tam-tam aiurea anul trecut si pe la noi.

There are two other points of tension between quantum mechanics and general relativity.

• First, classical general relativity breaks down at singularities, and quantum mechanics becomes inconsistent with general relativity in a neighborhood of singularities (however, no one is certain that classical general relativity applies near singularities in the first place).
• Second, it is not clear how to determine the gravitational field of a particle, since under the Heisenberg uncertainty principle of quantum mechanics its location and velocity cannot be known with certainty. The resolution of these points may come from a better understanding of general relativity
  

Candidate theories
There are a number of proposed quantum gravity theories. Currently, there is still no complete and consistent quantum theory of gravity, and the candidate models still need to overcome major formal and conceptual problems. They also face the common problem that, as yet, there is no way to put quantum gravity predictions to experimental tests, although there is hope for this to change as future data from cosmological observations and particle physics experiments becomes available

Una din aceste teorii care incearca sa lamureasca problema cu gravitatea este cea a lui Haisch si Rueda care explica existenta unor forte in vid si modul in care acestea genereaza masa, inertia si gravitatea:

If they can get their idea to work, Haisch and Rueda will have a theory of quantum gravity -- the long-sought marriage of Einstein's general relativity with quantum mechanics. It would finally allow physicists to understand the first moments after the big bang, and the crushing singularity at the core of a black hole.

Ar putea explica si alte fenomene momentan "inexplicabile" precum Efectul Casimir si alte chestii interesante, cu ajutorul teoriilor polarizarii vidului ale lui Puthoff si Dicke continuate apoi de catre Depp:

In 2005 Depp proposed a modification to the original PV work of Dicke that addresses many of the objections above. The revised model is not a replacement for general relativity but is meant to provide insight into the possible underlying physics of general relativity.

Dar deja ne lungim si lumea incepe sa caste, asa ca legatura intre aceste chestii de fizica aparent "abstracta" cu criza energetica a omenirii si unele teorii mai mult sau mai putin conspirationiste o vom vedea intr-un post ulterior.