Relativistic treatment of Verlinde s emergent force in Tsallis statistics
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1 arxiv:9.85v cond-mat.stat-mech] 9 Mar 9 Relativistic treatment of Verlinde s emergent force in Tsallis statistics L. Calderon,4, M. T. Martin,4, A. Plastino,4,5,6, M. C. Rocca,,4,5,V. Vampa Departamento de Ciencias Básicas, Facultad de Ingeniería, Departamento de Física, Universidad Nacional de La Plata, Departamento de Matemática, Universidad Nacional de La Plata, 4 Consejo Nacional de Investigaciones Científicas y Tecnológicas, Argentina, 5 IFLP-CCT-CONICET-C. C. 77, 9 La Plata, Argentina, 6 SThAR - EPFL, Lausanne, Switzerland March, 9 Abstract Following Chakrabarti,Chandrasekhar, and Naina Physica A 89 57], we attempt a classical relativistic treatment of Verlinde s emergent entropic force conjecture by appealing to a relativistic Hamiltonian in the context of Tsalli s statistics. The ensuing partition function becomes the classical one for small velocities. We show that Tsallis relativistic classical free particle distribution at temperature T can generate Newton s gravitational force s r distance s dependence. If we want to repeat the concomitant argument by appealing to Renyi s distribution, the attempt fails and one needs to modify the conjecture. Keywords: Tsallis and Renyi s relativistic distributions, classical partition function, entropic force. PACS: 5..-y, 5.7.Ce, 5.9.m
2 Contents Introduction Tsallis relativistic partition function for the free particle 4 Tsallis relativistic mean energy of the free particle 7 4 Specific heat in the linear constraints Tsallis scenario 9 5 The relativistic, Tsallis entropic force 6 The relativistic, Renyi s entropic force 7 Conclusions
3 Introduction In, Verlinde ] put forward a conjecture that connects gravity to an entropic force. Gravity would then arise out of information regarding the positions of material bodies it from bit. This idea links a thermal gravitytreatment to t Hooft s holographic principle. As a consequence, gravitation ought to be be regarded as an emergent phenomenon. Verlinde s conjecture attained considerable reception just as an example, see ]. For a superb overview on the statistical mechanics of gravitation, we recommend Padmanabhan s work ], and references therein. Verlinde s initiative originated works on cosmology, the dark energy hypothesis, cosmological acceleration, cosmological inflation, and loop quantum gravity. The literature is immense 4]. A relevant contribution to information theory is that of Guseo 5], who proved that the local entropy function, related to a logistic distribution, is a catenary and vice versa. Such invariance may be explained, at a deeper level, through the Verlindes conjecture on the origin of gravity, as an effect of the entropic force. Guseo puts forward a new interpretation of the local entropy in a system, as quantifying a hypothetical attraction force that the system would exert 5]. The present effort does not deal with any of these issues. What we will do is to show that a simple classical reasoning centered on Tsallis relativistic probability distributions proves Varlinde s conjecture. For Renyi s relativistic instance, one needs to modify the conjecture to achieve a similar result. Our point of departure is Ref. 6], in which their authors studied a canonical ensemble of N particles for a classical relativistic ideal gas, and found its specific heat in the Tsallis-Mendes-Plastino TMP scenario 7]. We will not use here the TMP scenario. Inspired by 6], we appeal as well to our previous effort 8] for non-relativistic results and deal with Tsallis statistics with linear constraints as a priori information 7]. In addition to finding, for the first time ever, relativistic Verlinde-results in a Tsallis context, we will, for the sake of completeness, register some advances regarding the relativistic Tsallis scenario with linear constraints for the ideal gas.
4 Tsallis relativistic partition function for the free particle The celebrated and well-known Tsalis entropy is a generalization of Shanon s one, that depends on a free real parameter q 7]. The q < instance We consider first the case q <. This case is not relevant to our Verlinde s endeavor 8], but is a logical addition to the results of 6]. Tsallis relativistic q-partition function for N free particles of mass m reads 6] Z = V N!h N qβ m c 4 p c mc ] q d 4 p.. Using spherical coordinates and integrating over the angles the precedent integral we have Z = 4πV N!h N qβ ] m c 4 p c mc q p dp.. With the change of variables y = p m c one now has Z = 4πV N!h N mc Let x be given by y = mcx. We have then Z = 4πV m c N!h N y y m c qβcy mc] q dy.. With s defined as x = s we obtain: Z = 4πV m c N!h N x x qβmc x ] q dx..4 s s s qβmc s ] q ds,.5 4
5 or Z = 4πV m c N!h N qβmc ] q 4πV m c N!h N qβmc ] q ] s q s s ds qβmc ] s q s s ds..6 qβmc Appealing to reference 9] we have now a result in terms of Hyper-geometric functions F and Beta functions B, namely, B Z = 4πV m c N!h N F, 5,, q F qβmc ] B 5, q βmc q q ; βmc q,, q ; βmc q ]..7 For βmc >>, mc >> k B T, we are in the non-relativistic case and have Z = πv ] m Γ Γ q..8 N!h N β q Γ The case q > Let is now consider gravitationally relevant 8] case q >. We have for the partition function Z = 4πV m c N!h N s s s Integrating on the angles we have again q q βmc s ] q ds..9 Z = 4πV m c N!h N βmc q s s s q βmc s ] q ds,. 5
6 or Z = 4πV m c N!h N q βmc ] q 4πV m c N!h N q βmc ] q By recourse to 9] we now obtain B Z = πv N!h N βmc q βmc q s s s s q βmc s q βmc s ] m B 5, q βmq βmc q, 5, 7 F q ; βmc q, q F,, 5 q ; βmc q ] q ds ] q ds.. ].. For βmc >>, the classic case, the partition function reads Z = πv ] m Γ Γ q,. N!h N βq Γ q 5 which is the usual non relativistic Tsalli s partition function for q > already obtained in 8]. Figure displays the graph of the function HT given by Z = πv N!h N ] m HT,.4 βq for q = 4, the specific q value needed for gravitaional considerations 8]. It tells us that Z is always positive, as it should be. 6
7 Tsallis relativistic mean energy of the free particle Case q < Let us now calculate the average energy corresponding, firstly in the case q <. For it we have Z < U >= V m N!h c 4 p c mc ] N or qβ ] m c 4 p c mc q d 4 p,.5 Z < U >= V N!h N qβ m c 4 p c mc m c 4 p c ] ] q d 4 p mc Z..6 With changes in the variables similar to those made for the partition function, we obtain here Z < U >= 4πV m4 C 5 N!h N This last equation can be rewritten as x x x qβmc x ] q dx..7 Z < U >= 4πV m4 C 5 N!h N βmc q] q x x x ] q x dx..8 qβmc Returning again to reference 9], we obtain for < U > < U >= 4πV m 4 c 5 N!h N Z βmc q ] 5 q B 7, 4 q βmc q 7
8 B F, 7, q ; βmc q 5, q F, 5, q ; βmc q ]..9 From this last equation we obtain the mean energy expression for the nonrelativistic case < U >= β 5 q].. Case q larger than one When q > we have Z < U >= 4πV m4 C 5 N!h N x x x q βmc x ] q dx mc Z.. Making a similar reasoning as for the case q < we obtain ] 4πV m 4 c 5 q < U >= B 7, q N!h N Z βmc q βmc q B, 7, F q 9 ; βmc q 5, q F, 5, q 7 βmc q ].. For βmc >> the non-relativistic case we obtain the result of 8], i.e., < U >= β 5q ].. 8
9 4 Specific heat in the linear constraints Tsallis scenario Let is now calculate the specific heat for the case q = 4, relevant for Verlindeendeavors 8]. This was not done in 6]. We should first note, with respect to Hyper-geometric functions, that We now use the notation Thus, we can write d F α, β, γ; z = αβf α, β, γ ; z. 4.4 dz F = F F = F F = F, 7, 9 ; k BT mc, 5, 7 ; k BT mc,, 5 ; k BT mc F 4 = F, 9, 9 4; k BT mc F 5 = F, 7, 7 4; k BT mc F 6 = F, 5, 5 4; k BT mc k B T, 4.5, 4.6, 4.7, 4.8, B 7 mc < U >= k B T, 4 F B 5, 4 F k B T B 5, 4 F mc B, 4, 4. F and, for the specific heat we have then C = < U > = < U > 9k B T B 7, 4 F k BT T T mc k B < U > B 5, 4 F 5k BT B 5, 4 F 8mc 5 B, 4 F 8 6 mc B 7, 4 F mc 4 5B 5, 4 F 8 5 k B T B 5, 4 F mc B, 4 F k B T mc B 5, 4 F B, 4 F. 4. This expression is plotted in Figure. We see that the specific heat is always positive, as it happens in the non-relativistic case 8]. 9
10 5 The relativistic, Tsallis entropic force We arrive now at our main present goal. We specialize things now to q = 4. Why do we select this special value q = 4? There is a solid reason. This is because S = ln q Z Z q β < U >. Since the entropic force is to be defined as proportional to the gradient of S, there is a unique q-value for which the dependence on r of the entropic force is r when ν =. Thus we obtain, for q = 4/, From. we can write from which it is obtained that S = β < U >Z. 5. < Z >= ar, 5. S = β < U >. 5. a r Following Verlinde ] we define the entropic force as F e = λ β S, 5.4 where indicates the four-gradient in Minkowskian space. F e = λ β β < U > a r e r, 5.5 where e r is the radial unit vector. We see that F e acquires an appearance quite similar to that of Newton s gravitational one, as conjectured by Verlinde en ]. In Figures and 4 the function L = β < U > is plotted. We see that L is always positive. This entails that the relativistic entropic force is purely gravitational.
11 6 The relativistic, Renyi s entropic force In Renyi s approach to our problem 8] the entropy is S = ln Z ln αβ < U >] α. 6. For α = 4, the expression for the entropy is S = ln Z ln β < U > ]. 6. The second term on the right hand of 6. is independent of r. Additionally, from 5. we obtain ln Z = ln r ln a. 6. Here we need to derive the entropy with respect to the area, thus changing Verlindes conjecture. As in the non-relativistic case 8], we have then F e = λ β S A e R = λ β 8πr e r. 6.4 This is again a gravitational expression for the entropic force. 7 Conclusions We obtained here the relativistic partition function Z of Tsalli s theory with linear constraints, that adequately reduces itself to its non-relativistic counterpart for small velocities. We do the same for the mean value of the energy< U > for the relativistic Hamiltonian of the ideal gas. We obtain the associated specific heat that turns out to be positive, as befits an ideal gas. From Z and < U > we obtained the relativistic entropy S We have presented two very simple relativistic classical realizations of Verlinde s conjecture. The Tsallis treatment, for q = 4/, seems to be neater, as the entropic force is directly associated to the gradient of Tsallis entropy S q, which acts as a potential, as Verlinde prescribes. This is not so in the Renyi instance, in which one has to modify Verlinde s F e definition and derive S with respect to the area.
12 Strictly speaking, Verlinde s conjecture can be unambiguously proved for the Tsallis entropy with q = 4/. The Renyi demonstration correspond to a modified version of Verlinde s conjecture. Of course, ours is a very preliminary, if significant, effort. A much more elaborate treatment would be desirable.
13 References ] E. Verlinde, arxiv:.785 hep-th]; JHEP 4 9. ] D. Overbye, A Scientist Takes On Gravity, The New York Times, July ; M. Calmthout, New Scientist 5 6. ] T. Padmanabhan, arxiv 8.6v. 4] J. Makela, arxiv:.88v; J. Lee, arxiv:5.47; V. V. Kiselev, S. A. Timofeev, Mod. Phys. Lett. A 5 ; T. Aaltonen et al; Mod. Phys. Lett. A ] R. Guseo, Physica A ] R. Chakrabarti, R. Chandrashekar, S.S. Naina Mohammed, Physica A ] C. Tsallis, Introduction to Nonextensive Statistical Mechanics Springer, Berlin, 9; M. Gell-Mann and C. Tsallis, Eds. Nonextensive Entropy: Interdisciplinary applications Oxford University Press, Oxford, 4; See for a regularly updated bibliography on the subject; A. R. Plastino, A. Plastino, Phys. Lett. A ] A. Plastino, M. C. Rocca, Physica A ] I. S. Gradshteyn and I. M. Ryzhik : Table of Integrals, Series and Products. Academic Press, Inc 98.
14 HT 8 HT function T 5 Figure : H function 4
15 CT T 5 Figure : Specific heat 5
16 LT. LT function T 5 Figure : LT = β < U > 6
17 LT LT function T 5 Figure 4: Centered LT = β < U > 7
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