What is mass?

Ordinary treatises define mass like the "the amount of matter in a body" but then we would be able to define first what is matter, and those treatises just define matter in a circular fashion as something that has non-zero mass. Essentially the same problem arises with attempts to define mass using the elusive concept of inertia as "the tendency of a body to keep moving once it is set in motion". In virtue of the above difficulties, it would be desirable to introduce mass as a primitive concept on the formalism, not defined in terms of anything more fundamental, and associate an operational definition to characterize its measurement.

Basic remarks on parallel computing

Parallel computing is a type of computation in which two or more computations are executed at the same time. The concept is well established in computer science and engineering, but there are lots of misunderstandings from general public in general forums, blogs, social media, and comments sections of news sites.

Extreme scale general-purpose processor

Research in progress.

What I would like for IceLake and Zen2... but is not happening

AMD and Intel have their own plans for their forthcoming products, and we have to accept their plans and purchase future hardware choosing among what both companies will offer us in the next years. My vision is different, as I wrote in a pair of recent tweets. This is what I would like.

Renormalized field theory from particle theory

Contrary to conventional wisdom that pretends that particle theory has been disproved and replaced by field theory, we demonstrate that the Hamiltonian particle theory gives an improved version of the usual field-theoretic Hamiltonian, without the difficulties associated to divergences. Moreover, the particle theory is formulated in base to physical charges and masses of particles, whereas field theory only can use unphysical bare quantities.


The neologism symplectics deriving from symplektikos the Ancient Greek συμπλεκτικός —combination of συμ «sum» and πλεκτικός «interlacing»— and literally meaning «braided together» or «intertwined» is the new term I have coined to designate a unified and self-consistent approach to understanding the Natural World. Symplectics is based in logic and measurements and can cover both microscopic and macroscopic scales, living and non-living matter, simple and complex phenomena, scientific and philosophical knowledge.

There are no negative heat capacities

The existence of exotic systems with anomalous negative heat capacities have been claimed in the recent literature. Those negative heat capacities are responsible for all kind of peculiar thermodynamic behaviors, such as the temperature of the anomalous system being reduced when the system is heated. Close inspection shows that negative heat capacities have not been measured, neither do exist.

State space evolution beyond mechanics

Our starting point will be the assumption that the state of our system (biological, physical, chemical, or otherwise) at a given time \( t \) is represented by a collection of \( D \) generic coordinates joined in a vector \( \mathbf{n}(t) = (n_1(t), n_2(t), n_i(t),\ldots n_D(t)) \). Note this vector depends on time implicitly.

What is heat?

Everyone has an intuitive conception of heat as something related to temperature, but a rigorous and broadly accepted scientific definition of heat is lacking despite several centuries of study.

Instantaneous electromagnetic interactions

Newton introduced a model of instantaneous direct interactions among massive particles. This model was latter replicated by Coulomb for charged particles and became known as action-at-a-distance; an unfortunate name has generated unending polemics among physicists and philosophers. A better name is direct-particle-interaction. Maxwell electrodynamics and general relativity introduced an alternative model of contact-action, where particles do not interact directly but by means of signals traveling through a mediator. Since the maximum possible speed for any object is the speed of light, interactions are retarded in contact-action models. Althought the Newton and Coulomb models are only valid for low velocities, it is proven that retarded interactions can be derived as approximations to generalized instantaneous interactions beyond Newton and Coulomb.

Researchgate: Are you kidding?

I lack a Researchgate account, but I noticed that Researchgate has created a fake profile about me where they are archiving works from mine whereas miss-attributing one of them to inexistent coworkers. My paper published on the International Journal of Thermodynamics is miss-attributed to two inexistent coworkers Juan Ramon and Callen Casas-Vazquez, when I am the only author.