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Worked low-speed correspondence at ∣w∣=c/5

Physical scope

Numerical specialisation of pthm-sr-newtonian-p-e-correspondence for a single massive particle state with |w|=c/5 in a named inertial frame of the flat model, in SI conventions. The displayed decimals are rounded values of exact radical expressions, not measurements; no experimental value, uncertainty or precision claim is made, and no other state or frame is covered.

Example

Specialise Specified low-speed momentum-energy correspondence between the relativistic measured quantities and the Newtonian comparison quantities to one massive particle of mass m>0 whose coordinate velocity w in a named inertial frame satisfies ∣w∣/c=1/5, so that z=1/25 and z0=z. Then γw=(1−1/25)−1/2=5/24=56/12≈1.0206207262 and K(z0)=38(25/24)5/2≈0.4152916366 (Rational powers ar of a positive base, Laws of rational exponents); all decimals below are rounded and all inequalities are between the exact expressions.

(a) [Rate of the expansion at z=1/25] γw−1−z2=56/12−51/50≈0.0006207262, while the bound of The uniform second-order Taylor remainder of z↦(1−z)−1/2 on [0,z0] is K(z0)z2=38(25/24)5/2/625≈0.0006644666, so the remainder bound holds. Precisely, the fractional overestimate of the positive remainder is K(z0)z2/R(z)−1≈0.0704665951, about 7%.

(b) [Energy and kinetic energy] En(P)−mc2=mc2(56/12−1)≈0.0206207262 mc2 while NK(m,w)=150mc2=0.02 mc2; the deviation ≈0.0006207262 mc2 obeys the bound K(z0)z m∣w∣2=mc2K(z0)z2≈0.0006644666 mc2 (all in units of mc2).

(c) [Momentum] ∣qn(P)∣=mγw∣w∣=612mc≈0.2041241452 mc while ∣Np(m,w)∣=mc/5=0.2 mc; the deviation is ≈0.0041241452 mc against the bound (12+K(z0)z)z mc/5≈0.0041328933 mc.

(d) [Momentum-to-velocity inversion] ∣w−qn(P)/m∣/∣w∣=γw−1=56/12−1≈0.0206207262, within the bound (12+K(z0)z)z≈0.0206644666 of clause (d) of the theorem.

The state is admissible: z=1/25<1, and w of norm c/5 is realized in a frame chart by the hypothesis; the case ∣w∣=c is not considered, and the numbers carry no empirical content.

Facts & Assumptions

Given: A massive particle state P=mU of Specified low-speed momentum-energy correspondence between the relativistic measured quantities and the Newtonian comparison quantities with constant m>0 in a named inertial frame, with coordinate velocity w satisfying ∣w∣/c=1/5, so z=∣w∣2/c2=1/25 and the speed bound z0=z.

[L1]

The correspondence theorem at the state, for z0=z=1/25 and K(z0)=38(1−z0)−5/2: En(P)=mc2+NK(m,w)+RE with ∣RE∣≤K(z0)zm∣w∣2; Tn(P)=NK(m,w)+RE with ∣Tn(P)−NK(m,w)∣≤2K(z0)zNK(m,w); qn(P)=Np(m,w)+Rq with ∣Rq∣≤(12+K(z0)z0)z∣Np(m,w)∣; w=qn(P)/(mγw) and ∣w−qn(P)/m∣=(γw−1)∣w∣≤(12+K(z0)z0)z∣w∣ (Specified low-speed momentum-energy correspondence between the relativistic measured quantities and the Newtonian comparison quantities,(a)-(d)).

[L2]

The uniform Taylor remainder: γw=(1−z)−1/2, γw−1=z2+R(z) and ∣R(z)∣≤K(z0)z2 (The uniform second-order Taylor remainder of z↦(1−z)−1/2 on [0,z0]).

[L3]

The observer identities: En(P)=mc2γw, Tn(P)=mc2(γw−1) and ∣qn(P)∣=mcγw2−1=mγw∣w∣ (Positivity, mass shell and kinetic energy of the observer quantities of a four-momentum,(b)).

[L4]

The comparison quantities: NK(m,w)=12m∣w∣2 and Np(m,w)=mw, so ∣Np(m,w)∣=m∣w∣ (Newtonian comparison momentum and kinetic energy in a named inertial frame).

[L5]

The Lorentz factor of the state's coordinate velocity: γw=(1−∣w∣2/c2)−1/2 (Norms of four-velocity and four-acceleration, and the observer rest-space decomposition,(e)).

[L6]

Rational powers: (a/b)−1/2=(b/a)1/2=b1/2a−1/2 for a,b>0, (25/24)5/2=(25/24)2(25/24)1/2, and (24/25)1/2=24/5=26/5 (Rational powers ar of a positive base, Laws of rational exponents).

Verification

technique · direct
1.1givenL5L6algebra

The numeric data. With z=1/25 and z0=z, [L5] and [L6] give γw=(2425)−1/2=(2524)1/2=524=526=5612, and K(z0)=38(25/24)5/2; the statement records the ten-place rounded values of these exact expressions.

2.1step 1.1L2L5algebra

Clause (a). By [L2] with z=1/25, the exact remainder and the exact bound are γw−1−z2=R(z)=5612−5150,K(z0)z2=38(2524)5/21625, the remainder is positive because γw2=25/24>(51/50)2 (cross multiplication gives 62500>62424) and both quantities are positive by [L5], so (γw−51/50)(γw+51/50)>0 with positive second factor, hence γw>51/50; its absolute value is at most the bound by [L2], and the statement records the ten-place rounded values of the two exact expressions and of the fractional overestimate K(z0)z2/R(z)−1.

2.2step 1.1L1L3L4algebra

Clause (c). By [L3] and [L4], ∣qn(P)∣=mγw∣w∣=m⋅5612⋅c5=612mc and ∣Np(m,w)∣=m∣w∣=mc/5, so the exact deviation is mc(6/12−1/5); the bound of [L1] clause (c) is (12+K(z0)z)z mc5=(12+K(z0)25)125mc5, and it dominates the deviation; the statement records the ten-place rounded values of both exact expressions.

2.3step 1.1L1algebra

Clause (d). By [L1], w=qn(P)/(mγw) exactly and ∣w−qn(P)/m∣=(γw−1)∣w∣, so the relative deviation is γw−1=56/12−1, which by [L1] clause (d) is at most (12+K(z0)z)z=(12+K(z0)/25)/25; the statement records the ten-place rounded values of these two exact expressions.

3.1step 1.1step 2.1L1L3L4algebra

Clause (b). By [L1] and [L3], En(P)−mc2=mc2(γw−1)=mc2(56/12−1) and NK(m,w)=12m(c/5)2=mc2/50, so the exact deviation is mc2(γw−1−150)=mc2(56/12−51/50), which is the remainder of step 2.1 and obeys the bound K(z0)zm∣w∣2=mc2K(z0)z2 of [L1] clause (a); the statement records the ten-place rounded values of the deviation and of this bound.

4.1step 2.1step 3.1step 2.2step 2.3given∎

Conclusion of the worked instance. The state satisfies the hypotheses of Specified low-speed momentum-energy correspondence between the relativistic measured quantities and the Newtonian comparison quantities with z=1/25<1 and z0=z; clauses (a)-(d) have been evaluated at the exact radical values γw=56/12 and K(z0)=38(25/24)5/2, every displayed inequality of the statement is the corresponding exact inequality of The uniform second-order Taylor remainder of z↦(1−z)−1/2 on [0,z0] or of the correspondence theorem at this data, and the decimals are the ten-place roundings of the displayed exact expressions. The numbers are a numerical illustration of the conditional correspondence for this one state and carry no empirical content or precision claim.

Depends on

Dependency tree · 2 levels

Sources