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Question 1

2votes

0answers

75views

Adiabatic evolution of the free vacuum in QFT

In the context of the pertubative expansion of Green's functions in Quantum Field Theory, it is a pretty standard trick to assume the free and interacting Hamiltonian are conected via adiabatic ...

Cement

89

askedOct 19 at 19:55

Question 2

2votes

0answers

87views

Adiabatic criterion in the context of the fractional quantum Hall effect

I'm trying to find a rigorous discussion of the adiabatic theorem as it applies to the quantum Hall effect (QHE). In many QHE arguments, processes are described as "adiabatic," but the ...

Makita_Youki

81

askedAug 3 at 15:33

Question 3

2votes

1answer

148views

Thermodynamics: Existence of reversible surface along the boundary of reachable adiabatic states

in Gabriel Weinreich's book "fundamental thermodynamics" there is the following passage:(see picture) is this correct? Why should the boundary be reversible?

papaspaxys

23

askedJul 26 at 9:32

Question 4

5votes

3answers

867views

Why does internal energy end up higher in an irreversible adiabatic process, even though the work done is less?

I am having a hard time understanding irreversibility in thermodynamic processes, more specifically, the situation my textbook presented. In an adiabatic expansion with a weightless piston held in ...

dedman2000

53

askedJul 21 at 19:34

Question 5

0votes

3answers

212views

Why do gas molecules lose energy (or speed) during adiabatic expansion (or vice-versa)?

As per the Kinetic Theory of Gases (KTG), gas molecules are postulated to undergo only elastic collisions, and thus the net kinetic energy of the system cannot change. Since internal energy is defined ...

Anmol Singh

33

askedJun 30 at 20:00

Question 6

0votes

1answer

131views

Does a reversible process that is both isothermal and adiabatic exist? Can we always join two states with an isothermal or adiabatic reversible path?

Is it possible for a reversible path between two states to be both adiabatic and isothermal, for a system having any number of independent variables? If it is not possible, why not?Another question:...

user1365926

59

askedJun 8 at 10:39

Question 7

2votes

0answers

199views

Adiabatic process

Original question:Consider a physical system in canonical ensemble. The entropy is defined as $$S=-\sum_i p_i\ln p_i,$$ where each $p_i$ corresponds to the probability of each possible microstate in ...

astakus

91

askedMar 31 at 4:22

Question 8

4votes

1answer

203views

How to derive the instantaneous eigenstate expansion from the time evolution operator for a time-dependent Hamiltonian?

Suppose at $t = 0$, the quantum state is given as a superposition of energy eigenstates $\left|n(0)\right\rangle$:$$|\Psi(0)\rangle=\sum_n c_n(0)\left|n(0)\right\rangle\quad .$$At later time $t$, we ...

James

81

askedMar 26 at 20:39

Question 9

2votes

1answer

323views

What is the meaning of adiabatic index $\gamma$?

What is the meaning of adiabatic index $\gamma$? some textbooks say its just the ratio $\frac{c_P}{c_V}$ and there's no physical meaning to it.But I read somewhere online that it is the capacity to ...

Maanav Mehta

35

askedMar 15 at 21:25

Question 10

-1votes

1answer

216views

Issue with Adiabatic Index Calculation and Pressure/Energy Density Ratio in Fermion System

i have a question regarding the adiabatic index or rather gamma thermal.It’s primarily about the pressure and the energy density.For the pressure P , I use the following integral:\begin{align}P = \...

X-SimE

31

askedMar 11 at 13:14

Question 11

0votes

0answers

84views

Understanding the Dark State Evolution and Energy Gaps in STIRAP

I am studying STIRAP (Stimulated Raman Adiabatic Passage) and trying to understand how the dark state evolves during the protocol. The standard STIRAP sequence involves two lasers:Laser S couples $|...

marco cavazza

1

askedFeb 24 at 18:13

Question 12

1vote

3answers

292views

Entropy and efficiencies of an adiabatic system

I have two thermally insulated pistons, one with no friction and the other with friction between the piston and wall. All the heat generated is assumed to end up in the gas. If I do the same amount of ...

George kirby

125

askedFeb 20 at 14:10

Question 13

2votes

3answers

315views

Why doesn't the Boltzmann entropy change in reversible adiabatic expansion?

I tried to ask this question here, but I formulated it badly and as a result the answers, while correct, didn't address my real concern.What I really want to know is, in reversible adiabatic ...

Adam Herbst

2,843

askedJan 26 at 17:57

Question 14

5votes

3answers

982views

Why can pressure be identified as partial of energy with respect to volume?

There's something I'm still struggling to grasp about the fundamental relation of thermodynamics. For a closed system, we have$$dU = \left.\frac{\partial U}{\partial S}\right|_V dS + \left.\frac{\...

Adam Herbst

2,843

askedJan 23 at 12:07

Question 15

1vote

3answers

392views

Relation between temperature and density in adiabatic process?

I'm having trouble understanding the relationship between density and temperature during an adiabatic process. I know that in such a process, there’s no heat exchange, but I’m unclear on how exactly ...

Meharaj hossain Arman

11

askedJan 12 at 4:28

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Questions tagged [adiabatic]

Adiabatic evolution of the free vacuum in QFT

Adiabatic criterion in the context of the fractional quantum Hall effect

Thermodynamics: Existence of reversible surface along the boundary of reachable adiabatic states

Why does internal energy end up higher in an irreversible adiabatic process, even though the work done is less?

Why do gas molecules lose energy (or speed) during adiabatic expansion (or vice-versa)?

Does a reversible process that is both isothermal and adiabatic exist? Can we always join two states with an isothermal or adiabatic reversible path?

Adiabatic process

How to derive the instantaneous eigenstate expansion from the time evolution operator for a time-dependent Hamiltonian?

What is the meaning of adiabatic index $\gamma$?

Issue with Adiabatic Index Calculation and Pressure/Energy Density Ratio in Fermion System

Understanding the Dark State Evolution and Energy Gaps in STIRAP

Entropy and efficiencies of an adiabatic system

Why doesn't the Boltzmann entropy change in reversible adiabatic expansion?

Why can pressure be identified as partial of energy with respect to volume?

Relation between temperature and density in adiabatic process?

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