Energy

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Quantum field theory accounts for everything in the Universe except gravity. On the other hand, General Relativity explains the relationship between matter/energy and space/time, and describes what we experience as gravitation.

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Gravitational potential is always
negative.
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Gravitational field is the negative derivative of the field with respect to
displacement.
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The potential being zero and the field non-zero makes sense only if a point is at an infinite distance from the source of gravity.
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Since we expend energy to
separate things against the gravitational force pulling them
together, the gravitational field has negative energy.

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If all of the positive energy in the universe equals all of the negative energy, the origin of the energy is a ‘free lunch’. We can take “zero” energy to split it into equal
amounts of positive energy and negative energy.
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All the energy in the universe started from the bigbang singlarity as heat, all the energy in the universe will end as heat(cosmic heat death).
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Emily Noether showed that conservation laws come from symmetries.
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The conservation of energy (“Energy  cannot be crested or destroyed”) , represents the time symmetry.

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Perhaps quantum fluctuations  triggered the zero energy to create
something i.e. to split into two opposite halves.
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To say “energy didn’t come from anywhere” would be to deny that “every action has an equal and opposite reaction”.

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The zero total energy of the universe includes mass as a positive contribution to energy and gravitational energy as negative.
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The Universe could have been created  from Nothing if no energy was needed in the first place.

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Perhaps the universe is really, “Much ado about nothing.”

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Our universe might be a subset of a larger reality where the rules are so  different that creating a universe of energy is a self-evident inevitability.
The amount of positive mass energy is balanced by negative gravitational  energy in the expansion of space. Since the total energy of the universe is 0, no energy was actually created.
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According to quantum field theory,  the universe is the manifestation of the potential energy of a scalar field which was concentrated in a singular point in the so called quantum vacuum,but science is silent about the origin of this scalar field.
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Einstein and George Gamow were
crossing a street, when Gamow just commented that maybe gravity could
be considered “negative” energy, in some sense.   Einstein was so
enthralled by the new idea that he stopped in the middle of the street to
mull this over.    Gamow had to stop traffic while Einstein pondered this.
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Antoine Lavoisier , the chemist,  first  stated the law of conservation of mass :
“We may lay it down as an incontestible axiom, that, in all the operations of art and nature, nothing is created; an equal quantity of matter exists both before and after the experiment; the quality and quantity of the elements remain precisely the same; and nothing takes place beyond changes and modifications in the combination of these elements.”

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Our very existence is the proof of a positive value for the total mass-energy of the universe.
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The origin of a universe with totally positive energy means a violation of the law of energy conservation. The positive mass-energy of every particle
might be cancelled by the negative potential energy of that particle’s associated gravitational field, creating what is known as the zero-energy universe .

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Within the context of general relativity, any non-zero energy density is
associated with a non-zero gravitational field, and such an attractive field, in turn, possesses a negative value for its potential energy.
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In Edward Tyron’s cosmological model, the positive mass-energy of every particle is cancelled by the negative potential energy of that particle’s associated gravitational field, creating an asymptotically “flat”  zero-energy universe .
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A quantum is the minimum amount of any physical entity involved in an interaction.

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A photon is a single quantum of light referred to as light quantum. A photon is quantised EM field.

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Since energy is not a ‘thing’, we cannot say that energy is made of something.
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Energy is a property of

everything that exists.

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A photon has energy that can be transferred.
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Since energy is not a ‘thing’, it cannot be created or destroyed, but can be transformed.
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Mass is not made of anything.

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Mass is a form of energy.
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‘The energy of the interaction’(non-thing) between ‘quarks and gluons’(things/fields) is what gives protons and neutrons their mass (non-thing).

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‘The energy of the interaction’(non-thing) between ‘quarks and gluons’(things/fields) is released when stable atomic nuclei with less binding energy are produced via  fission or fusion.

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Our sun  produces energy via fusion of hydrogen(4 separate protons) into helium( a nucleus of 2 protons & 2 neutrons).

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Objects / things may have energy and mass, but they are not energy or mass.

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Physics says that energy can’t be destroyed, but it is silent about what happens to energy when the universe dies and nothing is left.

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Physics says that Energy cannot be created or destroyed, but it is silent about how it came about in
the first place.
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Non-things like energy or mass cannot be created or destroyed.

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Perhaps the total energy in the universe is zero. If we take all the positive energy(carried by standard model particles except gravitons)
and add it with an equal amount of negative(gravitational) energy, we will get zero.

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A Sapiens needs just 1,500–2,500 calories per day in order to survive.
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Internal energy may be stored in a number of ways (degrees of freedom) within a substance.
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There is one energy and it can be seen as kinetic or potential or even as both at the same time.
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Potential and kinetic energies are not physically different. They are perceived by us as difererent because we see one as a function of the separation, and the other as a funcion of the velocity.In both cases the energy is proporional to the mass of both bodies.

 
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There is one energy and it can be seen as kinetic or potential or even as both at the same time.

 
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The Hamiltonian (T+U) gives us the total energy, but the Lagrangian (T-U) tells us how the energy is distributed between kinetic and potential, with a maximum when potential is low and a minimum when it is high.

 
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