Quantum Gravity Planck Mass Measured Totally Independent of Big G Utilizing McCulloch-Heisenberg Newtonian Equivalent Gravity

In 2014, McCulloch showed, in a new and interesting way, how to derive a gravity theory from Heisenberg’s uncertainty principle that is equivalent to Newtonian gravity. McCulloch utilizes the Planck mass in his derivation and obtains a gravitational constant of h̄c mp . This is a composite constant, which is equivalent in value to Newton’s gravitational constant. However, McCulloch has pointed out that his approach requires an assumption on the value of G, and that this involves some circular reasoning. This is in line with the view that the Planck mass is a derived constant from Newton’s gravitational constant, while big G is a universal fundamental constant. Here we will show that we can go straight from the McCulloch derivation to measuring the Planck mass without any knowledge of the gravitational constant. From this perspective, there are no circular problems with his method. This means that we can measure the Planck mass without Newton’s gravitational constant, and shows that the McCulloch derivation is a theory of quantum gravity that stands on its own. And further we show that we can easily measure the Schwarzschild radius of a mass without knowing its mass, or Newton’s gravitational constant, or the Planck constant. The very essence of gravity is linked to the Planck length and the speed of light, but here we will claim that we do not need to know the Planck length itself. Our conclusion is that Newton’s gravitational constant is a universal constant, but it is a composite constant of the form G = lpc 3 h̄ where the Planck length and the speed of light are the keys to gravity. This could be an important step towards the development of a full theory of quantum gravity.


McCulloch-Heisenberg Newton Equivalent Gravity
In 2014, McCulloch [1] derived an equivalent gravity to that of Newton [2] directly from the Heisenberg uncertainty principle and gets the following equation for the gravity force (See Appendix A.1 for a short review of his derivation.) Where¯h c m 2 p ⇡ 6.67384 ⇥ 10 11 m 3 · kg 1 · s 2 . That is basically identical to the empirically-measured gravitational constant value, even if there is large uncertainty in Newton's gravitational constant [3,4,5,6,7]; this is something we will return to later. Still, we cannot know its value without knowing the speed of light, the Planck constant, and the Planck mass. The speed of light is known and can be measured with no knowledge of gravity (and is exact per definition), the Planck constant can be found from the Watt balance (Kibble balance) [8,9,10]. However, the Planck mass is unknown and it is generally assumed that we must know G in order to calculate the Planck mass. This point is mentioned by McCulloch himself in a follow-up paper [11]. In that paper he states In the above gravitational derivation, the correct value for the gravitational constant G can only be obtained when it is assumed that the gravitational interaction occurs between whole multiples of the Planck mass, but this last part of the derivation involves some circular reasoning since the Planck mass is defined using the value for G. This is fully in line with modern physics' view that the only way to find the Planck mass is to derive it from big G. The Planck mass, the Planck temperature (energy), the Planck length, and the Planck time were introduced in 1899 by Max Planck [12,13] himself. Planck derived these units, which he called natural units, from what he considered to be the most fundamental universal constants: Newton's gravitational constant, the speed of light, and the Planck constant. Based on this, we need to know Newton's gravitational constant to find the Planck mass from Planck's formula, m p = q¯h c G . However, as we will see here, we can build on McCulloch's derivation, complete a few more derivations, and easily design a simple experiment to measure the Planck mass independent of Newton's gravitational constant, or knowledge of any other theories of gravity.

The Planck Mass Measured Directly from McCulloch's Derivation and a Cavendish Apparatus
Newton did not measure the gravitational constant himself; this was first done indirectly by Cavendish [14] in 1798. Us-ing a Cavendish apparatus, we can measure the Planck mass without any knowledge of Newton's gravitational constant, or any knowledge of Newtonian gravity. A Cavendish apparatus consist of two small balls and two larger balls, all made of lead, for example. The torque (moment of force) is given by where k is the torsion coefficient of the suspending wire and q is the deflection angle of the balance. We then have the following well-known relationship where L is the length between the two small balls in the apparatus. Further, F can be set equal to the gravitational force given by McCulloch's Heisenberg-derived formula This means we must have We also have that the natural resonant oscillation period of a torsion balance is given by Further, the moment of inertia I of the balance is given by this means we have and when solved with respect to k, this gives Next in equation 5 we are replacing k with this expression, and solving with respect to the Planck mass The mass M is the mass of each of the two large lead balls in the Cavendish apparatus, not the mass of the Earth. All we need in order to find the mass of the large balls is an accurate weight. The Planck constant can be found from the Watt balance. The angle q and the time T are what we measure with the Cavendish apparatus. The length L is the distance between the small lead balls and r is the distance between the large lead ball's center to the center of the small lead ball, when the arm is in equilibrium position (mid position).
Today there even exists a small, ready-to-use, low budget (a few thousand dollars) Cavendish apparatus, where the angle of the arm (and the time) are measured very accurately by fine electronics and plugged directly into a computer with a USB cable; see Figure 1. Using this low budget apparatus we can measure the Planck mass with about 5% inaccuracy on our kitchen table without any knowledge of Newton's gravitational constant.
As soon as we know the Planck mass, we have the the complete composite gravitational constant and the McCulloch formula can then be applied to any standard gravitational predictions, such as finding the mass of the Earth, or predicting the orbital velocity of planets and satellites.
Haug [15] has, in a similar way, shown how the Planck length can be found independent of big G, but his derivation did not start out with the McCulloch-Heisenberg Newton equivalent gravity theory, so we think the derivation and discussion in this paper offer important additional insight. See also Appendix A.2, on how we can extend the derivation above using the McCulloch-Heisenberg gravity to find the Planck length and Planck time "directly" from a Cavendish apparatus.

Why Newton's Gravitational Constant Likely Is a Universal Composite Constant
In our analysis, the first strong indication that the gravitational constant is a composite constant is given by its output units, which are m 3 · kg 1 · s 2 . It would be very strange if something concerning the fundamental nature of reality would be meters cubed, divided by kg and seconds squared. The Planck mass, on the other hand, is somewhat easier to relate to, even if it is somewhat of a mystery at a deeper level. The speed Figure 1: Low budget modern Cavendish apparatus combining old mechanics with modern electronics. It is remarkable that with such an instrument we can measure the Planck mass with only about 5% error from the kitchen table, or here from the top of my grand piano. of light is also something we can relate to logically; it is the distance light travels in vacuum during a pre-specified time interval. The Planck constant is more complex (and outside the scope of this paper), but it is related to the view that energy seems to come in quanta. In sum though, the Planck mass, the speed of light, and the Planck constant seem to be more intuitive than the gravitational constant.
In 2016, Haug [16] suggested that the gravitational constant of the form G = Haug has shown that assuming the gravitational constant is a composite will help make all of the Planck units more intuitive. For example, the Planck time is given by t p = q Gh c 5 ; when rewritten based on the idea that the gravitational constant is a composite, this simply gives the (known) t p = l p c .
The latter form is also known from before, but the view that the Newtonian gravitational constant is a composite renders the form t p = q Gh c 5 unnecessary. We might then ask, what is the intuition about c 5 and G? The answer may not be so clear. On the other hand, the intuition behind l p c is very simple; it is simply a very short distance divided by the speed of light, so given a very short time interval, we can see that it is coming directly out from the formula. Haug's gravitational constant composite formula has the same challenge in that one might think we may end up with a circular problem, again, because modern physics typically assumes that we need to know big G before we can find the Planck units. However, as we have shown in this paper this is not the case.
This does not mean big G is wrong; it is just likely to be a composite universal constant rather than a fundamental constant.
We find that many gravitational formulas may be seen in a new perspective when rewritten based on the idea that Newton's gravitational constant is a composite constant; we summarise a selection of such gravitational formulas in Table 1.
a Actually, Newton's gravitational force has never been observed directly, only indirectly though the predictions that come from mathematically rearranging this formula to develop other predictions, such as orbital velocity.
b To my knowledge the escape velocity has not been tested empirically. c At least not directly. d At least not directly. d At least not directly. d Needs further investigation and confirmation; see [17] for more details. d Needs further investigation and confirmation; see [17] for more details.

Relative Standard Uncertainty
Assume we have measured the Planck mass (with a standard uncertainty of 1%) on the kitchen table with Cavendish apparatus plugged into our computer. The relative uncertainty in the gravitational constant must then be That is to say, the standard uncertainty in the Newton gravitational constant will always be twice that of the standard uncertainty in the Planck mass measurements. This is in line with what is reported by NIST (2014) CODATA, which reports a relative standard uncertainty for the gravitational constant of 4.7 ⇥ 10 5 and 2.3 ⇥ 10 5 for the Planck mass.

Conclusion
We have shown that the Planck mass can be measured with a Cavendish apparatus without any prior knowledge of gravity except for the McCulloch gravity derived directly from Heisenberg's uncertainty principle. This no longer posits the Planck mass as simply being a derived constant from big G, but possibly makes it even more important than big G, since the gravitational constant can be written as a composite constant G =¯h c m p . This indicates that the Planck units are the truly fundamental units and that the gravitational constant likely is a composite constant. This also implies that the Planck units play a very central role in gravity. After years of thinking about the problem, we have come up with this gravity experiment to measure the Planck mass, the Planck length, and Planck time. It is quite remarkable it has taken us about 119 years since Max Planck first suggested the natural Planck units to discover a way to measure them totally independent of any knowledge of Newton's gravitational constant. This could be an important step toward a theory of quantum gravity that unites the quantum scale and the cosmological scale.