Fractional Schrödinger equation

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iℏ∂∂t|ψ(t)⟩=H^|ψ(t)⟩

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The fractional Schrödinger equation is a fundamental equation of fractional quantum mechanics. It was discovered by Nick Laskin (1999) as a result of extending the Feynman path integral, from the Brownian-like to Lévy-like quantum mechanical paths. The term fractional Schrödinger equation was coined by Nick Laskin.[1]

## Contents

* 1 Fundamentals
* 1.1 Time-independent fractional Schrödinger equation
* 1.2 Probability current density
* 1.2.1 Velocity operator
* 2 Physical applications
* 2.1 Fractional Bohr atom
* 2.2 The infinite potential well
* 2.3 Fractional quantum oscillator
* 2.3.1 Energy levels of the 1D fractional quantum oscillator in semiclassical approximation
* 2.4 Fractional quantum mechanics in solid state systems
* 2.5 Self-accelerating beams
* 3 See also
* 4 References
* 5 Further reading

## Fundamentals

The fractional Schrödinger equation in the form originally obtained by Nick Laskin is:[2]

iℏ∂ψ(𝐫,t)∂t=Dα(−ℏ2Δ)α/2ψ(𝐫,t)+V(𝐫,t)ψ(𝐫,t)

* r is the 3-dimensional position vector,
* ħ is the reduced Planck constant,
* ψ(r, t) is the wavefunction, which is the quantum mechanical probability amplitude for the particle to have a given position r at any given time t,
* V(r, t) is a potential energy,
* Δ = ∂2/∂r2 is the Laplace operator.

Further,

* Dα is a scale constant with physical dimension [Dα] = [energy]1 − α·[length]α[time]−α, at α = 2, D2 =1/2m, where m is a particle mass,
* the operator (−ħ2Δ)α/2 is the 3-dimensional fractional quantum Riesz derivative defined by (see, Ref.[2]);

(−ℏ2Δ)α/2ψ(𝐫,t)=1(2πℏ)3∫d3pei𝐩𝐫ℏ|𝐩|αφ(𝐩,t),

Here, the wave functions in the position and momentum spaces; ψ(𝐫,t) and φ(𝐩,t) are related each other by the 3-dimensional Fourier transforms:

ψ(𝐫,t)=1(2πℏ)3∫d3pei𝐩⋅𝐫/ℏφ(𝐩,t),φ(𝐩,t)=∫d3re−i𝐩⋅𝐫/ℏψ(𝐫,t).

The index α in the fractional Schrödinger equation is the Lévy index, 1 < α ≤ 2\. Thus, the fractional Schrödinger equation includes a space derivative of fractional order α instead of the second order (α = 2) space derivative in the standard Schrödinger equation. Thus, the fractional Schrödinger equation is a fractional differential equation in accordance with modern terminology.[3] This is the main point of the term fractional Schrödinger equation or a more general term fractional quantum mechanics.[4] At α = 2 fractional Schrödinger equation becomes the well-known Schrödinger equation.

The fractional Schrödinger equation has the following operator form

iℏ∂ψ(𝐫,t)∂t=H^αψ(𝐫,t)

where the fractional Hamilton operator H^α is given by

H^α=Dα(−ℏ2Δ)α/2+V(𝐫,t).

The Hamilton operator, H^α corresponds to the classical mechanics Hamiltonian function introduced by Nick Laskin

Hα(𝐩,𝐫)=Dα|𝐩|α+V(𝐫,t),

where p and r are the momentum and the position vectors respectively.

### Time-independent fractional Schrödinger equation

The special case when the Hamiltonian Hα is independent of time

Hα=Dα(−ℏ2Δ)α/2+V(𝐫),

is of great importance for physical applications. It is easy to see that in this case there exist the special solution of the fractional Schrödinger equation

ψ(𝐫,t)=e−(i/ℏ)Etϕ(𝐫),

where ϕ(𝐫) satisfies

Hαϕ(𝐫)=Eϕ(𝐫),

Dα(−ℏ2Δ)α/2ϕ(𝐫)+V(𝐫)ϕ(𝐫)=Eϕ(𝐫).

This is the time-independent fractional Schrödinger equation (see, Ref.[2]).

Thus, we see that the wave function ψ(𝐫,t) oscillates with a definite frequency. In classical physics the frequency corresponds to the energy. Therefore, the quantum mechanical state has a definite energy E. The probability to find a particle at 𝐫 is the absolute square of the wave function |ψ(𝐫,t)|2. Because of time-independent fractional Schrödinger equation this is equal to |ϕ(𝐫)|2 and does not depend upon the time. That is, the probability of finding the particle at 𝐫 is independent of the time. One can say that the system is in a stationary state. In other words, there is no variation in the probabilities as a function of time.

### Probability current density

The conservation law of fractional quantum mechanical probability has been discovered for the first time by D.A.Tayurskii and Yu.V. Lysogorski [5]

∂ρ(𝐫,t)∂t+∇⋅𝐣(𝐫,t)+K(𝐫,t)=0,

where ρ(𝐫,t)=ψ∗(𝐫,t)ψ(𝐫,t) is the quantum mechanical probability density and the vector 𝐣(𝐫,t) can be called by the fractional probability current density vector

𝐣(𝐫,t)=Dαℏi(ψ*(𝐫,t)(−ℏ2Δ)α/2−1∇ψ(𝐫,t)−ψ(𝐫,t)(−ℏ2Δ)α/2−1∇ψ*(𝐫,t)),

and

K(𝐫,t)=Dαℏi(∇ψ(𝐫,t)(−ℏ2Δ)α/2−1∇ψ*(𝐫,t)−(∇ψ*(𝐫,t)(−ℏ2Δ)α/2−1∇ψ(𝐫,t)),

here we use the notation (see also matrix calculus): ∇=∂/∂𝐫.

It has been found in Ref.[5] that there are quantum physical conditions when the new term K(𝐫,t) is negligible and we come to the continuity equation for quantum probability current and quantum density (see, Ref.[2]):

∂ρ(𝐫,t)∂t+∇⋅𝐣(𝐫,t)=0.

Introducing the momentum operator 𝐩^=ℏi∂∂𝐫 we can write the vector 𝐣 in the form (see, Ref.[2])

𝐣=Dα(ψ(𝐩^2)α/2−1𝐩^ψ∗+ψ∗(𝐩^∗2)α/2−1𝐩^∗ψ).

This is fractional generalization of the well-known equation for probability current density vector of standard quantum mechanics (see, Ref.[7]).

#### Velocity operator

The quantum mechanical velocity operator 𝐯^ is defined as follows:

𝐯^=iℏ(Hα𝐫^−𝐫^Hα),

Straightforward calculation results in (see, Ref.[2])

𝐯^=αDα|𝐩^2|α/2−1𝐩^.

Hence,

𝐣=1α(ψ𝐯^ψ∗+ψ∗𝐯^ψ),1<α≤2.

To get the probability current density equal to 1 (the current when one particle passes through unit area per unit time) the wave function of a free particle has to be normalized as

ψ(𝐫,t)=α2vexp⁡[iℏ(𝐩⋅𝐫−Et)],E=Dα|𝐩|α,1<α≤2,

where v is the particle velocity, v=αDαpα−1.

Then we have

𝐣=𝐯v,𝐯=αDα|𝐩2|α2−1𝐩,

that is, the vector 𝐣 is indeed the unit vector.

## Physical applications

### Fractional Bohr atom

When V(𝐫) is the potential energy of hydrogenlike atom,

V(𝐫)=−Ze2|𝐫|,

where e is the electron charge and Z is the atomic number of the hydrogenlike atom, (so Ze is the nuclear charge of the atom), we come to following fractional eigenvalue problem,

Dα(−ℏ2Δ)α/2ϕ(𝐫)−Ze2|𝐫|ϕ(𝐫)=Eϕ(𝐫).

This eigenvalue problem has first been introduced and solved by Nick Laskin in.[6]

Using the first Niels Bohr postulate yields

αDα(nℏan)α=Ze2an,

and it gives us the equation for the Bohr radius of the fractional hydrogenlike atom

an=a0nα/(α−1).

Here a0 is the fractional Bohr radius (the radius of the lowest, n = 1, Bohr orbit) defined as,

a0=(αDαℏαZe2)1/(α−1).

The energy levels of the fractional hydrogenlike atom are given by

En=(1−α)E0n−α/(α−1),1<α≤2,

where E0 is the binding energy of the electron in the lowest Bohr orbit that is, the energy required to put it in a state with E = 0 corresponding to n = ∞,

E0=(Ze2αDα1/αℏ)α/(α−1).

The energy (α − 1)E0 divided by ħc, (α − 1)E0/ħc, can be considered as fractional generalization of the Rydberg constant of standard quantum mechanics. For α = 2 and Z = 1 the formula (α−1)E0/ℏc is transformed into

Ry=me4/2ℏ3c,

which is the well-known expression for the Rydberg formula.

According to the second Niels Bohr postulate, the frequency of radiation ωm,n associated with the transition, say, for example from the orbit m to the orbit n, is,

ωm,n=(1−α)E0ℏ[1nαα−1−1mαα−1].

The above equations are fractional generalization of the Bohr model. In the special Gaussian case, when (α = 2) those equations give us the well-known results of the Bohr model.[7]

### The infinite potential well

A particle in a one-dimensional well moves in a potential field V(x), which is zero for −a≤x≤a and which is infinite elsewhere,

V(x)=∞,x<−a

|
|

(i)

V(x)=0,−a≤x≤a

|
|

(ii)

V(x)=∞, x>a

|
|

(iii)

It is evident a priori that the energy spectrum will be discrete. The solution of the fractional Schrödinger equation for the stationary state with well-defined energy E is described by a wave function ψ(x), which can be written as

ψ(x,t)=(−iEtℏ)ϕ(x),

where ϕ(x), is now time independent. In regions (i) and (iii), the fractional Schrödinger equation can be satisfied only if we take ϕ(x)=0. In the middle region (ii), the time-independent fractional Schrödinger equation is (see, Ref.[6]).

Dα(ℏ∇)αϕ(x)=Eϕ(x).

This equation defines the wave functions and the energy spectrum within region (ii), while outside of the region (ii), x < −a and x > a, the wave functions are zero. The wave function ϕ(x) has to be continuous everywhere, thus we impose the boundary conditions ϕ(−a)=ϕ(a)=0 for the solutions of the time-independent fractional Schrödinger equation (see, Ref.[6]). Then the solution in region (ii) can be written as

ϕ(x)=Aexp⁡(ikx)+Bexp⁡(−ikx).

To satisfy the boundary conditions we have to choose

A=−Bexp⁡(−i2ka),

and

sin⁡(2ka)=0.

It follows from the last equation that

2ka=nπ.

Then the even (ϕneven(−x)=ϕneven(x) under reflection x->−x) solution of the time-independent fractional Schrödinger equation ϕeven(x) in the infinite potential well is

ϕneven(x)=1acos⁡[nπx2a],n=1,3,5,…

The odd (ϕnodd(−x)=−ϕnodd(x) under reflection x->−x) solution of the time-independent fractional Schrödinger equation ϕeven(x) in the infinite potential well is

ϕnodd(x)=1asin⁡[nπx2a],n=2,4,6,…

The solutions ϕeven(x) and ϕodd(x) have the property that

∫−aadxϕmeven(x)ϕneven(x)=∫−aadxϕmodd(x)ϕnodd(x)=δmn,

where δmn is the Kronecker symbol and

∫−aadxϕmeven(x)ϕnodd(x)=0.

The eigenvalues of the particle in an infinite potential well are (see, Ref.[6])

En=Dα(πℏ2a)αnα,n=1,2,3,…,1<α≤2.

It is obvious that in the Gaussian case (α = 2) above equations are ö transformed into the standard quantum mechanical equations for a particle in a box (for example, see Eq.(20.7) in [8])

The state of the lowest energy, the ground state, in the infinite potential well is represented by the ϕneven(x) at n=1,

ϕground(x)≡ϕ1even(x)=1acos⁡(πx2a),

and its energy is

Eground=Dα(πℏ2a)α.

### Fractional quantum oscillator

Fractional quantum oscillator introduced by Nick Laskin (see, Ref.[2]) is the fractional quantum mechanical model with the Hamiltonian operator Hα,β defined as

Hα,β=Dα(−ℏ2Δ)α/2+q2|𝐫|β,1<α≤2,1<β≤2,

where q is interaction constant.

The fractional Schrödinger equation for the wave function ψ(𝐫,t) of the fractional quantum oscillator is,

iℏ∂ψ(𝐫,t)∂t=Dα(−ℏ2Δ)α/2ψ(𝐫,t)+q2|𝐫|βψ(𝐫,t)

Aiming to search for solution in form

ψ(𝐫,t)=e−iEt/ℏϕ(𝐫),

we come to the time-independent fractional Schrödinger equation,

Dα(−ℏ2Δ)α/2ϕ(𝐫,t)+q2|𝐫|βϕ(𝐫,t)=Eϕ(𝐫,t).

The Hamiltonian Hα,β is the fractional generalization of the 3D quantum harmonic oscillator Hamiltonian of standard quantum mechanics.

#### Energy levels of the 1D fractional quantum oscillator in semiclassical approximation

The energy levels of 1D fractional quantum oscillator with the Hamiltonian function Hα=Dα|p|α+q2|x|β were found in semiclassical approximation (see, Ref.[2]).

We set the total energy equal to E, so that

E=Dα|p|α+q2|x|β,

whence

|p|=(1Dα(E−q2|x|β))1/α.

At the turning points p=0. Hence, the classical motion is possible in the range |x|≤(E/q2)1/β.

A routine use of the Bohr-Sommerfeld quantization rule yields

2πℏ(n+12)=∮pdx=4∫0xmpdx=4∫0xmDα−1/α(E−q2|x|β)1/αdx,

where the notation ∮ means the integral over one complete period of the classical motion and xm=(E/q2)1/β is the turning point of classical motion.

To evaluate the integral in the right hand we introduce a new variable y=x(E/q2)−1/β. Then we have

∫0xmDα−1/α(E−q2|x|β)1/αdx=1Dα1/αq2/βE1α+1β∫01dy(1−yβ)1/α.

The integral over dy can be expressed in terms of the Beta-function,

∫01dy(1−yβ)1/α=1β∫01dzz1β−1(1−z)1α=1βB(1β,1α+1).

Therefore,

2πℏ(n+12)=4Dα1/αq2/βE1α+1β1βB(1β,1α+1).

The above equation gives the energy levels of stationary states for the 1D fractional quantum oscillator (see, Ref.[2]),

En=(πℏβDα1/αq2/β2B(1β,1α+1))αβα+β(n+12)αβα+β.

This equation is generalization of the well-known energy levels equation of the standard quantum harmonic oscillator (see, Ref.[7]) and is transformed into it at α = 2 and β = 2\. It follows from this equation that at 1α+1β=1 the energy levels are equidistant. When 1<α≤2 and 1<β≤2 the equidistant energy levels can be for α = 2 and β = 2 only. It means that the only standard quantum harmonic oscillator has an equidistant energy spectrum.

### Fractional quantum mechanics in solid state systems

The effective mass of states in solid state systems can depend on the wave vector k, i.e. formally one considers m=m(k). Polariton Bose-Einstein condensate modes are examples of states in solid state systems with mass sensitive to variations and locally in k fractional quantum mechanics is experimentally feasible [1].

### Self-accelerating beams

Self-accelerating beams, such as the Airy beam, are known solutions of the conventional free Schrödinger equation (with α=2 and without a potential term). Equivalent solutions exist in the free fractional Schrödinger equation. The time-dependent fractional Schrödinger equation in momentum space (assuming ℏ=1 and with one spatial coordinate) is:

i∂φ(p,t)∂t=Dα|p|αφ(p,t).

In position space, an Airy beam is typically expressed using the special Airy function, although it possesses a more transparent expression in momentum space:

ψ(x,t=0)=Ai(bx)exp⁡(ax),φ(p,t=0)=12b2πexp⁡((a−ip)33b3).

Here, the exponential function ensures the square-integrability of the wave function, i.e. that the beam possesses a finite energy, in order to be a physical solution. The parameter a controls the exponential cut-off on the beam’s tail, while the parameter b controls the width of the peaks in position space. The Airy beam solution for the fractional Schrödinger equation in momentum space is obtained from simple integration of the above equation and initial condition:

φ(p,t)=12b2πexp⁡(−iDα|p|αt+(a−ip)33b3).

This solution self-accelerates at a rate proportional to t23−α.[9] When taking α=2 for the conventional Schrödinger equation, one recovers the original Airy beam solution with a parabolic acceleration (∝t2).

## See also

* Schrödinger equation
* Path integral formulation
* Relation between Schrödinger's equation and the path integral formulation of quantum mechanics
* Fractional calculus
* Quantum harmonic oscillator
* Variable-order fractional Schrödinger equation

## References

1. ↑ Laskin, Nikolai (2000). "Fractional quantum mechanics and Lévy path integrals". Physics Letters A 268 (4–6): 298–305. doi:10.1016/S0375-9601(00)00201-2.
2. ↑ Laskin, Nick (18 November 2002). "Fractional Schrödinger equation". Physical Review E 66 (5): 056108. doi:10.1103/physreve.66.056108. ISSN 1063-651X. PMID 12513557.
3. ↑ S. G. Samko, A. A. Kilbas, and O. I. Marichev, Fractional Integrals and Derivatives, Theory and Applications ~Gordon and Breach, Amsterdam, 1993
4. ↑ Laskin, Nick (1 August 2000). "Fractional quantum mechanics". Physical Review E (American Physical Society (APS)) 62 (3): 3135–3145. doi:10.1103/physreve.62.3135. ISSN 1063-651X. PMID 11088808.
5. ↑ Tayurskii, D A; Lysogorskiy, Yu V (29 November 2012). "Superfluid hydrodynamic in fractal dimension space". Journal of Physics: Conference Series (IOP Publishing) 394: 012004. doi:10.1088/1742-6596/394/1/012004. ISSN 1742-6588.
6. ↑ Laskin, Nick (2000). "Fractals and quantum mechanics". Chaos: An Interdisciplinary Journal of Nonlinear Science (AIP Publishing) 10 (4): 780–790. doi:10.1063/1.1050284. ISSN 1054-1500. PMID 12779428.
7. ↑ Bohr, N. (1913). "XXXVII. On the constitution of atoms and molecules". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science (Informa UK Limited) 26 (153): 476–502. doi:10.1080/14786441308634993. ISSN 1941-5982. https://zenodo.org/record/1430916.
8. ↑ L.D. Landau and E.M. Lifshitz, Quantum mechanics (Non-relativistic Theory), Vol.3, Third Edition, Course of Theoretical Physics, Butterworth-Heinemann, Oxford, 2003
9. ↑ Colas, David (2020). "Self-accelerating beam dynamics in the space fractional Schrödinger equation". Physical Review Research 2: 033274. doi:10.1103/PhysRevResearch.2.033274.

* R. Herrmann (2011). "9". Fractional Calculus, An Introduction for Physicists. World Scientific. ISBN 978-981-4340-24-3. https://books.google.com/books?id=mPXzp1f7ycMC&pg=PA97&dq=fractional+schrodinger+equation#v=onepage.
* J. Klafter; S.C. Lim; R. Metzler (2012). Fractional Dynamics: Recent Advances. World Scientific. p. 426. ISBN 978-981-434-059-5. https://books.google.com/books?id=wwfqHij4V2MC&dq=fractional+schrodinger+equation.
* V.E. Tarasov (2010). "19". Fractional dynamics. Nonlinear physical science. 0. Springer. ISBN 978-3-642-140-037. https://books.google.com/books?id=Mc193Swt_JQC&pg=PA465&dq=Fractional+quantum+mechanics+N+Laskin#v=onepage.
* J. Sabatier, O.P.Agrawal, J.A.T.Machado (2007). Advances in Fractional Calculus: Theoretical Developments and Applications in Physics and Engineering. Springer. ISBN 978-1-402-060-427. https://books.google.com/books?id=8lBgSDVXULwC&pg=PA126&dq=Fractional+quantum+mechanics+N+Laskin#v=onepage.
* D. Baleanu; J.A.T. Machado; A.C.J. Luo (2012). "17". Fractional Dynamics and Control. Springer. ISBN 978-1-461-404-576. https://books.google.com/books?id=8tpLwiLONDkC&pg=PA210&dq=Fractional+quantum+mechanics+N+Laskin#v=onepage.
* Pinsker, F.; Bao, W.; Zhang, Y.; Ohadi, H.; Dreismann, A.; Baumberg, J. J. (25 November 2015). "Fractional quantum mechanics in polariton condensates with velocity-dependent mass". Physical Review B 92 (19): 195310. doi:10.1103/physrevb.92.195310. ISSN 1098-0121.

## Further reading

* Laskin, N. (2018). Fractional Quantum Mechanics. World Scientific. doi:10.1142/10541. ISBN 978-981-322-379-0.
* Naber, Mark (2004). "Time fractional Schrödinger equation". Journal of Mathematical Physics (AIP Publishing) 45 (8): 3339–3352. doi:10.1063/1.1769611. ISSN 0022-2488.
* Guo, Xiaoyi; Xu, Mingyu (2006). "Some physical applications of fractional Schrödinger equation". Journal of Mathematical Physics (AIP Publishing) 47 (8): 082104. doi:10.1063/1.2235026. ISSN 0022-2488.
* Wang, Shaowei; Xu, Mingyu (2007). "Generalized fractional Schrödinger equation with space-time fractional derivatives". Journal of Mathematical Physics (AIP Publishing) 48 (4): 043502. doi:10.1063/1.2716203. ISSN 0022-2488.
* Dong, Jianping; Xu, Mingyu (2007). "Some solutions to the space fractional Schrödinger equation using momentum representation method". Journal of Mathematical Physics (AIP Publishing) 48 (7): 072105. doi:10.1063/1.2749172. ISSN 0022-2488.
* Dong, Jianping; Xu, Mingyu (2008). "Space–time fractional Schrödinger equation with time-independent potentials". Journal of Mathematical Analysis and Applications (Elsevier BV) 344 (2): 1005–1017. doi:10.1016/j.jmaa.2008.03.061. ISSN 0022-247X.
* Tarasov, Vasily E. (2008). "Fractional Heisenberg equation". Physics Letters A 372 (17): 2984–2988. doi:10.1016/j.physleta.2008.01.037. ISSN 0375-9601.
* Tarasov, Vasily E. (2008). "Weyl quantization of fractional derivatives". Journal of Mathematical Physics 49 (10): 102112. doi:10.1063/1.3009533. ISSN 0022-2488.
* Iomin, Alexander (28 August 2009). "Fractional-time quantum dynamics". Physical Review E 80 (2): 022103. doi:10.1103/physreve.80.022103. ISSN 1539-3755. PMID 19792181.
* Tarasov, Vasily E. (2010). "Fractional Dynamics of Open Quantum Systems". Nonlinear Physical Science. Berlin, Heidelberg: Springer Berlin Heidelberg. pp. 467–490. doi:10.1007/978-3-642-14003-7_20. ISBN 978-3-642-14002-0.
* Tarasov, Vasily E. (2010). "Fractional Dynamics of Hamiltonian Quantum Systems". Nonlinear Physical Science. Berlin, Heidelberg: Springer Berlin Heidelberg. pp. 457–466. doi:10.1007/978-3-642-14003-7_19. ISBN 978-3-642-14002-0.
* de Oliveira, Edmundo Capelas; Costa, Felix Silva; Vaz, Jayme (2010). "The fractional Schrödinger equation for delta potentials". Journal of Mathematical Physics (AIP Publishing) 51 (12): 123517. doi:10.1063/1.3525976. ISSN 0022-2488. http://www.repositorio.unicamp.br/handle/REPOSIP/73668.
* de Oliveira, E Capelas; Vaz, Jayme (5 April 2011). "Tunneling in fractional quantum mechanics". Journal of Physics A: Mathematical and Theoretical (IOP Publishing) 44 (18): 185303. doi:10.1088/1751-8113/44/18/185303. ISSN 1751-8113.
* Bayın, Selçuk Ş. (2012). "On the consistency of the solutions of the space fractional Schrödinger equation". Journal of Mathematical Physics (AIP Publishing) 53 (4): 042105. doi:10.1063/1.4705268. ISSN 0022-2488.

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| Classical mechanics|

* Continuum
* Solid
* Fluid
* Acoustics

|

Electrodynamics|

* Electrostatics
* Magnetostatics
* Plasma physics
* Accelerator physics

Statistical mechanics|

* Thermodynamics
* Condensed matter
* Materials
* Mesoscopic
* Polymers
* Soft
* Solid-state

Modern|

| Quantum mechanics|

* Quantum electrodynamics
* Quantum field theory
* Quantum gravity
* Quantum information

|

Relativity|

* General
* Special

Particle physics|

* Astroparticle
* Nuclear
* Quantum chromodynamics

Atomic, molecular
and optical physics|

* Atomic physics
* Molecular physics
* Optics
* Photonics
* Quantum optics

Cosmology|

* Astrophysics
* Nuclear
* Celestial mechanics
* Solar
* Heliophysics
* Space physics

Interdisciplinary|

* Biophysics
* Agrophysics
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* Engineering
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* Atmospheric
* Cloud
* Materials science
* Mathematical physics
* Physical chemistry
* Chemical physics
* Physical oceanography
* Quantum computing
* Social physics
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See also|

* History of physics
* Nobel Prize in Physics
* Timeline of physics discoveries
* Theory of everything

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