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วิทยาลัยเพื่อการค้นคว้าระดับรากฐาน

Burin Gumjudpai / บุรินทร์ กำจัดภัย

Present positions

Popular articles

  • งานเขียนในคอลัมน์ Perspective 7 ผู้จัดการออนไลน์วิทยาศาสตร์

Some teaching materials

  • 251100 Philosophy of Science (ปรัชญาวิทยาศาสตร์) [ Course URL ]

Research

  • inSPIRE database: 16 articles (12 published), 308 Cited, h-index = 8

  • Main Research: Theoretical Cosmology and Dark Energy Models

    Though the universe is very big today, however it was created from a tiny entity with the size of Planck length in the very primordial era 13.7 billion years ago. It was the Big Bang that originated the universe. When the universe was very tiny at the beginning, properties of everything are very extreme, i.e. temperature and energy density therein are utterly high. All events are described by most fundamental knowledge we have ever had which is the unification of quantum theory and gravitational force-quantum gravities. At present there are many candidates for quantum gravities and could be more in future. Examples of these candidates are such as superstring theories, discrete gravitational theories and others. The prime ones are versions of superstring theories. How do we acquire knowledge of the superstring or how do we test it? This can not be done directly since the string energy scale is very high but it can be tested indirectly by considering lower energy scales of string theory and find a way to test it or to observe its results at the lower energy scales. String theories predict existence of extra-dimensions apart from the well known 4-dimensional spacetime. Formulations of the low energy effective theories of superstrings usually depend on how the extra-dimensions are compactified and or how higher-dimensional geometrical objects in string theories are embedded in hyperspace. What remains should be the effective theory that is valid at low energy and at late time. The standard low energy theory is the famous Einstein’s general relativity (GR) which, to date, is a best theory for gravity.

    Lately we were told by present observations that the universe is now in acceleration phase of expansion which is not capable for GR to explain. This gives a signature that there must be some missing pieces in GR or it should be modified to alternative gravitational theories in place of GR in order to describe what is going on. This motivated idea of dark energy in form of scalar field. Dark energy is usually the energy contents giving negative pressure and repulsive gravity. Dark energy could be scalar field because the field can render negative pressure and repulsive gravity. The scalar field is predicted in symmetrical breaking of fundamental force at beyond 1 TeV. This energy scale is the target that experiments at the LHC is trying to reach. A few types of scalar field is also motivated from string theories such as phantom canonical, Dirac-Born-Infeld, tachyonic and etc. These ideas arise from version of low energy effective theory of string theory. We can calculate related physical quantities of the models to be checked by results from observations and from experiments. We aim to be able to constraint and rule out some model of alternative gravity. Testing and investigating these models would more or less help constructing the realistic model of quantum gravity.

  • Other Interest: Non-Equilibrium Thermodynamics

    As known, absolute temperature "T" has played a role of fundamental abstarct physical quantity which can not be measured directly. The 0th law of thermodynamics laid foundation stone for the existence of T as a basic state function. Then the whole body of equilibrium thermodynamics can be developed from it. As equivalent to the 0th law and T, the 2nd law of thermodynamics gives the light for the existence of entropy "S". From here, the new branch of "dissipative" structure of thermodynamics arises. I am curious about this new structure and wonder how we can apply them to the other subjects like (1) signal systems (2) ecological physics (3) economical physics and (4) traffic flows.

Selected Publications

 

Physicis Confidimvs
The Tah Poe Academia Institute for Theoretical Physics and Cosmology
Temporary Office at Physics Building, Naresuan University, Phitsanulok 65000 Thailand