Pavlo Danylchenko
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Introduction
Inherent
in the classical physics
ordinary notions about the absolute simultaneity of events and about
uniqueness of concept of time, as well as of determination of spatial volume
which moving body fills in, essentially hinder us from the formation of the
most perfect relativistic generalization of thermodynamics. Purely logically-mathematical
approach to the solution of the problems, which don’t permit to get the full interconsistency of thermodynamics special (SR) and general (GR)
relativities, can’t guarantee the positive result of theoretical research in
principle. To attain the aim we need to make philosophical remaking sense of many of
our physical notions, which are
only conceived as finally established and unshakable. This work is the attempt of construction
of relativistic thermodynamics, based on the rejection of some dogmata, inherent not only in classical physics but also in well-known
relativistic generalizations of thermodynamics.
It
is considered that SR itself doesn’t lead
to the unique concept of the temperature, attributed to moving body [1,2]. Therefore a few relativistic generalizations of thermodynamics with
lorentz-invariant pressure are known. First of all there are Planck-Hasenöhrl relativistic thermodynamics [3–5] and
Ott relativistic thermodynamics [6], which are equally
based on the lorentz-invariance of entropy and pressure but use essentially
different transformations of temperature and heat [2,7]. According to Planck and Hasenöhrl, moving body is “colder” than motionless [1].
On the contrary, according to Ott transformations, moving body
is “hotter” than motionless. Thermodynamics with lorentz-invariant
relativistic temperature [1,8] is attractive for the fact that in this thermodynamics temperatures of
phase transitions are the intrinsic properties of substances as they are in
classical thermodynamics. However the equations of this thermodynamics don’t lead
to such conversion of the energy of radiation that corresponds to the relativistic
Doppler shift of the frequency of radiation.
In
most relativistic generalizations of thermodynamics the linear momentum of moving body is used as an additional extensive parameter. However, in
contrast to mechanics, in relativistic thermodynamics this
linear momentum is considered to be proportional to the enthalpy H of
matter [1,9,10] but not to the internal energy U, which is equivalent to the
eigenvalue of the mass of matter. Therefore this linear momentum forms the four-vector
with hamiltonian of enthalpy but not with the hamiltonian of energy of the
matter [1,10]. And as D’Alembert pseudoforce of inertia is the value derived from the linear momentum, in fact it is proposed to use the enthalpy of matter
instead of its mass as the measure of inertness.
In some of the relativistic generalizations of
thermodynamics, along with invariant pressure, noninvariant forms of
relativistic pressure are proposed. In such noninvariant forms of relativistic
pressure the presence of mechanical linear momentum [9]
and heat exchange [11,12] for moving body is taking into account.
1. Nonextensivity of relativistic molar volume
Two “equal in rights” relativistic values of
molar volume of the matter, which is moving at the velocity v=dx/dt in the external frame of references of spatial coordinates and time
(FR), are possible in principle. These values are: Lagrangian volume vR = v/G, which in common three-dimensional space is filled in by the world
points of moving matter (these world points correspond to the same moment of
time t of the external FR); and Hamiltonian volume vR*=vG,
which in this space is filled in by the world points of moving matter (these world points correspond to the same
moment of relativistic standard time t* (which is identical with the proper time t0 of matter) of this matter and, consequently,
to the same collective space-time state of this matter [13,14]). Here: v – value of molar volume of the matter in comoving FR (eigenvalue
of molar volume); G=(1–v2/c2)–1/2 – relativistic dilation of physical processes
and time in the moving; c – constant (eigenvalue) of the velocity of
light.
In classical thermodynamics eigenvalue of molar
volume v(S, p) is strictly extensive parameter and its change causes
the change of enthalpy, and consequently the change of rates of physical processes,
not directly, but via change of entropy S and eigenvalue of pressure p.
Relativistic values of molar volume vR and vR* are not strictly extensive parameters and, therefore, can’t be equivalent
to nonrelativistic value (eigenvalue) of molar volume v. Relativistic shrinkage
of the length and, cinsequently, of the molar volume vR is aimed at guaranteeing of isotropy of the frequency of electromagnetic
interaction of the molecules, atoms and elementary particles of matter and,
thus, it is aimed at the guaranteeing of isotropy of the rate of physical
processes in moving matter [13,14]. Therefore, change of this shrinkage has the direct influence on the relativistic value of enthalpy
and on the rates of physical processes and rates of proiper time of moving
matter. Moreover, relativistic decrease of molar volume of the matter is not accompanied
by overcoming of any forces of resistance to it and, consequently, it takes
place inertially and in strong coordination with the change of the velocity of
matter. Therefore, relativistic shrinkage of body length and of molar volume of
the matter of this body are considered in SR as purely kinematic effect, which
is not accompanied by expenditure of energy on the execution of work on
relativistic “selfcontraction” of matter. And if the energy was expended not only
on the increasing of the value of linear momentum but also additionally on its
“selfcontraction”, for the purely dynamic consideration of the matter (this
consideration doesn’t take into account these additional expenditure of energy)
law of conservation of energy wouldn’t be fulfilled in the mechanics.
All
this is the sufficiently strong reason for the use of only strictly extensive value of molar volume (vR*·vR)1/2=v, which is equal to the eigenvalue of molar volume in classical thermodynamics, in relativistic equations of equilibrium state of matter. Lorentz-invariance of energy density e and of equivalent to it mass density
m=e/с2 is the consequence of lorentz-invariance of the strictly extensive value
of molar volume.
This gives the possibility to make the most
simple definition of lagrangian (according to [9], internal energy of matter
2. Noninvariance of the pressure
According to Noether theorem [17] the law
of conversation of energy
is the consequence of the presence of symmetry for time and the fulfillment of
this law is possible only for homogeneity of time. This homogeneity of time is in
the invariance of physical laws relatively to the change of the start of time reading
and this homogeneity is guaranteed by the use of uniform scale, by which rates
of physical processes in matter in its identical thermodynamic states are equal
in any moment of time, for its measuring. According to this, mutual
complementarity of energy and time, which is declared by Bohr principle of
complementarity and becomes apparent in the presence of Heisenberg uncertainty
relation of these physical characteristics, takes place.
In
the system of units of measurment of physical magnitude, which is
based on dimensionless Planck constant h and, thus, reflects the presence of mutual complementarity of
energy and time, the dimension of pressure [sec–1m–3] denotes the
following. In not comoving with matter FR of exterior observer the value of pressure, as well
as the value of energy (dimension [sec–1]), must depend on the rate of time
in this FR. According to GR in rigid FR only proportional synchronization of clocks, time rates by which in
different points of space with different values of gravitational potential are
not equal, is possible. In accordance with this, value of pressure in any point
j of such physically inhomogeneous space is determined by rates of physical
processes not only in this point but also in the point i, from which observation
takes place [16]: jip= jivc·p=(vcj/vci)p.
Here vcj and vci – set by gravitational
field improper gravibaric (coordinate-like [10]) values of the velocity of
light in the points j and i of matter, which is in spatially
inhomogeneous equilibrium thermodynamic state [15,18]. Therefore if we want the
pressure in matter to remain intensive parameter, its relativistic value must be
unequal in different IFR, which are moving relatively to this matter at unequal
velocities, and its transformations must be the same as for all other intensive
parameters. And, consequently, relativistic value of pressure in moving matter,
which is determined in Minkowski space and in fact attributed to comoving with this
matter space, must be the same times smaller than its eigenvalue as observed by
external observer rate of physical processes in this matter and, consequently, in
comoving with it space: pR=p/G . To the contrary, relativistic value of pressure, which is determined in covariant
world space and attributed to resting three-dimensional observer space, must be
the same times greater than
its eigenvalue: pR*=pG. After all, in not comoving with matter FR of external observer rates of physical processes in the points of this space
are the several times greater than in comoving with matter FR. And these
processes take place the same times smaller for external observer than for
observer, resting in comoving with matter FR. The conception of lorentz-invariance of pressure
is connected with the substitution
of the extensive value of molar volume v for nonstrictly extensive lagrangian
value vR of this volume in relativistic differential equations of equilibrium state
of matter.
3. Main differential equations of relativistic
thermodynamics in contravariant representation
Equations of relativistic thermodynamics are usually determined in coordinates of
contravariant world space (Minkowski space) and, therefore, covariant
relativistic value of energy (hamiltonian) is being expressed not via covariant
relativistic value of enthalpy HR*=HG, but via contravariant relativistic
values of enthalpy HR=H/G and thermodynamic parameters attributed to moving matter:
Here, taking into account all stated above, total relativistic energy
dUR* =(TdS–pdv)G +
and no
work on relativistic “selfcontraction” of matter is executed. Here: w=vP*=UGv2/c2 – external energy
(energy of tranfer [9]) of matter, TR=T/G – contravariant relativistic value of temperature
(Planck temperature [1,2,5]) of moving body.
In contrast to Planck linear momentum,
mechanical linear momentum (which doesn’t depend on pressure directly) P*=
Fin=– (∂P*/∂t)S,v=– (∂URg* /∂G)S,v,vc ·dG/dx= –(URg*)dlnG/dx,
as well
as gravitational pseudoforce:
Fg=–(∂URg* /∂vc)S,v,G ·gradvc=–URg* ·grad(lnvc),
where: URg*=
The increment of contravariant relativistic
value of enthalpy:
dHR=(TdS+vdp)/G –HR dlnG=TR·dS+ vR·GdpR –P*dv=TR·dS+ vdpR–P*dv,
as well as increment of ordinary enthalpy H, is determined by increments of only intensive parameters (except, of course,
the increment of entropy).
4. Main differential equations of relativistic
thermodynamics in covariant representation
In FR, in which the motion of matter is
observed, differental equations of relativistic thermodynamics may be also determined
in coordinates of covariant world space:
URdt*+Pdx =
At that, contravariant relativistic value of energy (lagrangian)
where: G*=(1+v*2/c2)–1/2=1/G ; P=(∂UR*/∂v*)S,v=UG*v*/c2=U(∂UR*/∂P*)S,v=Uv/c2 – contravariant value of mechanical linear
momentum; v*=(∂x/∂s)x0= dx/dt*=Gv – spatial component of four-velocity, which in fact is the velocity of motion of matter determined in observer FR not by its intrinsic clock,
but by relativistic standard clock, comoving with this matter. According to this:
P*=Uv*/c2, Pv*= P*v,
and:
Main differential equations of relativistic
thermodynamics in their contravariant representation have
the following form:
dHR*=(TdS+vdp)/G *–HR* dlnG*=TR*·dS+vdpR* +Pdv*,
dUR =(TdS–pdv)G * +
Here: TR*=T/G*=TG – Ott relativistic temperature [1,2,6,7], which corresponds to the accelerated rates of physical processes in the points of
space where matter is in the state of motion. Thus, areas of space filled in with moving matter become “hotter” [1] than coincidal with them areas of
intrinsic space of matter. Any pair of
correlated photons, which in
comoving with matter FR have the same energy Uc0 and
propagate in it strictly in opposite directions, in not
comoving with matter FR have total energy G times greater than in comoving with
matter FR: Uc+Uc' =2Uc0G=2Uc0/G*, where:
Uc=Uc0G* [1–(v/c)cosj]–1 = Uc0G [1+(v/c)cosj0]; Uc' =Uc0G* [1–(v/c)cosj']–1 = Uc0G [1+(v/c)cos(j0+p)];
j0 and (j0+p) – angles in
comoving with matter FR between directions of propagation of photons and direction of matter motion; j
and j' – corresponding to them angles in not comoving with matter FR, in which directions of propagation
of correlated photons are not parallel in general case.
This, as well as numerous works [2,6,7,10], which confirmed the validity of consideration of
Ott relativistic temperature TR*=TG side by side with Planck temperature TR=T/G, denotes appropriateness of
consideration of covariant relativistic generalization of thermodynamics side
by side with contravariant one.
Conclusions
Examined here relativistic generalization of thermodynamics with strictly extensive molar volume and lorentz-invariant entropy
and energy of density is devoid of many disadvantages of relativistic generalizations with lorentz-invarisnt pressure and allows us to newly interpret perception of course of physical processes in moving body from not
comoving with it FR. Possibility of two complementary representations of differential equations of
relativistic thermodynamics (contravariant and covariant) solves
the problem of the presence of two alternative relativistic temperatures –
Planck temperature and Ott temperature.
Full version of the article PDF ( 156 kb), DOC ( 40 kb).
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